mirror of https://gitee.com/openkylin/qemu.git
fpu/softfloat: re-factor float to int/uint
We share the common int64/uint64_pack_decomposed function across all the helpers and simply limit the final result depending on the final size. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée
parent
dbe4d53a59
commit
ab52f973a5
935
fpu/softfloat.c
935
fpu/softfloat.c
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@ -1320,6 +1320,186 @@ float64 float64_trunc_to_int(float64 a, float_status *s)
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return float64_round_pack_canonical(pr, s);
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}
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/*
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* Returns the result of converting the floating-point value `a' to
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* the two's complement integer format. The conversion is performed
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* according to the IEC/IEEE Standard for Binary Floating-Point
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* Arithmetic---which means in particular that the conversion is
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* rounded according to the current rounding mode. If `a' is a NaN,
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* the largest positive integer is returned. Otherwise, if the
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* conversion overflows, the largest integer with the same sign as `a'
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* is returned.
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*/
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static int64_t round_to_int_and_pack(FloatParts in, int rmode,
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int64_t min, int64_t max,
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float_status *s)
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{
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uint64_t r;
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int orig_flags = get_float_exception_flags(s);
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FloatParts p = round_to_int(in, rmode, s);
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switch (p.cls) {
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case float_class_snan:
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case float_class_qnan:
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return max;
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case float_class_inf:
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return p.sign ? min : max;
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case float_class_zero:
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return 0;
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case float_class_normal:
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if (p.exp < DECOMPOSED_BINARY_POINT) {
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r = p.frac >> (DECOMPOSED_BINARY_POINT - p.exp);
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} else if (p.exp - DECOMPOSED_BINARY_POINT < 2) {
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r = p.frac << (p.exp - DECOMPOSED_BINARY_POINT);
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} else {
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r = UINT64_MAX;
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}
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if (p.sign) {
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if (r < -(uint64_t) min) {
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return -r;
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} else {
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return min;
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}
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} else {
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if (r < max) {
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return r;
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} else {
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return max;
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}
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}
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default:
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g_assert_not_reached();
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}
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}
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#define FLOAT_TO_INT(fsz, isz) \
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int ## isz ## _t float ## fsz ## _to_int ## isz(float ## fsz a, \
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float_status *s) \
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{ \
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FloatParts p = float ## fsz ## _unpack_canonical(a, s); \
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return round_to_int_and_pack(p, s->float_rounding_mode, \
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INT ## isz ## _MIN, INT ## isz ## _MAX,\
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s); \
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} \
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\
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int ## isz ## _t float ## fsz ## _to_int ## isz ## _round_to_zero \
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(float ## fsz a, float_status *s) \
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{ \
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FloatParts p = float ## fsz ## _unpack_canonical(a, s); \
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return round_to_int_and_pack(p, float_round_to_zero, \
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INT ## isz ## _MIN, INT ## isz ## _MAX,\
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s); \
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}
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FLOAT_TO_INT(16, 16)
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FLOAT_TO_INT(16, 32)
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FLOAT_TO_INT(16, 64)
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FLOAT_TO_INT(32, 16)
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FLOAT_TO_INT(32, 32)
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FLOAT_TO_INT(32, 64)
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FLOAT_TO_INT(64, 16)
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FLOAT_TO_INT(64, 32)
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FLOAT_TO_INT(64, 64)
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#undef FLOAT_TO_INT
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/*
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* Returns the result of converting the floating-point value `a' to
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* the unsigned integer format. The conversion is performed according
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* to the IEC/IEEE Standard for Binary Floating-Point
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* Arithmetic---which means in particular that the conversion is
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* rounded according to the current rounding mode. If `a' is a NaN,
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* the largest unsigned integer is returned. Otherwise, if the
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* conversion overflows, the largest unsigned integer is returned. If
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* the 'a' is negative, the result is rounded and zero is returned;
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* values that do not round to zero will raise the inexact exception
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* flag.
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*/
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static uint64_t round_to_uint_and_pack(FloatParts in, int rmode, uint64_t max,
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float_status *s)
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{
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int orig_flags = get_float_exception_flags(s);
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FloatParts p = round_to_int(in, rmode, s);
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switch (p.cls) {
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case float_class_snan:
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case float_class_qnan:
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return max;
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case float_class_inf:
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return p.sign ? 0 : max;
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case float_class_zero:
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return 0;
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case float_class_normal:
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{
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uint64_t r;
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if (p.sign) {
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return 0;
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}
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if (p.exp < DECOMPOSED_BINARY_POINT) {
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r = p.frac >> (DECOMPOSED_BINARY_POINT - p.exp);
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} else if (p.exp - DECOMPOSED_BINARY_POINT < 2) {
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r = p.frac << (p.exp - DECOMPOSED_BINARY_POINT);
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} else {
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return max;
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}
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/* For uint64 this will never trip, but if p.exp is too large
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* to shift a decomposed fraction we shall have exited via the
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* 3rd leg above.
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*/
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if (r > max) {
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s->float_exception_flags = orig_flags | float_flag_invalid;
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return max;
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} else {
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return r;
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}
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}
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default:
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g_assert_not_reached();
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}
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}
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#define FLOAT_TO_UINT(fsz, isz) \
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uint ## isz ## _t float ## fsz ## _to_uint ## isz(float ## fsz a, \
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float_status *s) \
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{ \
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FloatParts p = float ## fsz ## _unpack_canonical(a, s); \
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return round_to_uint_and_pack(p, s->float_rounding_mode, \
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UINT ## isz ## _MAX, s); \
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} \
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\
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uint ## isz ## _t float ## fsz ## _to_uint ## isz ## _round_to_zero \
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(float ## fsz a, float_status *s) \
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{ \
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FloatParts p = float ## fsz ## _unpack_canonical(a, s); \
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return round_to_uint_and_pack(p, s->float_rounding_mode, \
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UINT ## isz ## _MAX, s); \
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}
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FLOAT_TO_UINT(16, 16)
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FLOAT_TO_UINT(16, 32)
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FLOAT_TO_UINT(16, 64)
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FLOAT_TO_UINT(32, 16)
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FLOAT_TO_UINT(32, 32)
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FLOAT_TO_UINT(32, 64)
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FLOAT_TO_UINT(64, 16)
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FLOAT_TO_UINT(64, 32)
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FLOAT_TO_UINT(64, 64)
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#undef FLOAT_TO_UINT
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/*----------------------------------------------------------------------------
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| Takes a 64-bit fixed-point value `absZ' with binary point between bits 6
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| and 7, and returns the properly rounded 32-bit integer corresponding to the
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@ -2671,288 +2851,8 @@ float128 uint64_to_float128(uint64_t a, float_status *status)
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return normalizeRoundAndPackFloat128(0, 0x406E, a, 0, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 32-bit two's complement integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic---which means in particular that the conversion is rounded
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| according to the current rounding mode. If `a' is a NaN, the largest
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| positive integer is returned. Otherwise, if the conversion overflows, the
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| largest integer with the same sign as `a' is returned.
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*----------------------------------------------------------------------------*/
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int32_t float32_to_int32(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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uint64_t aSig64;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac( a );
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aExp = extractFloat32Exp( a );
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aSign = extractFloat32Sign( a );
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if ( ( aExp == 0xFF ) && aSig ) aSign = 0;
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if ( aExp ) aSig |= 0x00800000;
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shiftCount = 0xAF - aExp;
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aSig64 = aSig;
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aSig64 <<= 32;
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if ( 0 < shiftCount ) shift64RightJamming( aSig64, shiftCount, &aSig64 );
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return roundAndPackInt32(aSign, aSig64, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 32-bit two's complement integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic, except that the conversion is always rounded toward zero.
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| If `a' is a NaN, the largest positive integer is returned. Otherwise, if
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| the conversion overflows, the largest integer with the same sign as `a' is
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| returned.
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*----------------------------------------------------------------------------*/
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int32_t float32_to_int32_round_to_zero(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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int32_t z;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac( a );
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aExp = extractFloat32Exp( a );
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aSign = extractFloat32Sign( a );
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shiftCount = aExp - 0x9E;
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if ( 0 <= shiftCount ) {
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if ( float32_val(a) != 0xCF000000 ) {
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float_raise(float_flag_invalid, status);
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if ( ! aSign || ( ( aExp == 0xFF ) && aSig ) ) return 0x7FFFFFFF;
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}
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return (int32_t) 0x80000000;
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}
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else if ( aExp <= 0x7E ) {
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if (aExp | aSig) {
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status->float_exception_flags |= float_flag_inexact;
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}
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return 0;
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}
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aSig = ( aSig | 0x00800000 )<<8;
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z = aSig>>( - shiftCount );
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if ( (uint32_t) ( aSig<<( shiftCount & 31 ) ) ) {
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status->float_exception_flags |= float_flag_inexact;
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}
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if ( aSign ) z = - z;
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return z;
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 16-bit two's complement integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic, except that the conversion is always rounded toward zero.
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| If `a' is a NaN, the largest positive integer is returned. Otherwise, if
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| the conversion overflows, the largest integer with the same sign as `a' is
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| returned.
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*----------------------------------------------------------------------------*/
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int16_t float32_to_int16_round_to_zero(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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int32_t z;
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aSig = extractFloat32Frac( a );
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aExp = extractFloat32Exp( a );
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aSign = extractFloat32Sign( a );
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shiftCount = aExp - 0x8E;
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if ( 0 <= shiftCount ) {
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if ( float32_val(a) != 0xC7000000 ) {
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float_raise(float_flag_invalid, status);
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if ( ! aSign || ( ( aExp == 0xFF ) && aSig ) ) {
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return 0x7FFF;
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}
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}
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return (int32_t) 0xffff8000;
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}
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else if ( aExp <= 0x7E ) {
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if ( aExp | aSig ) {
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status->float_exception_flags |= float_flag_inexact;
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}
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return 0;
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}
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shiftCount -= 0x10;
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aSig = ( aSig | 0x00800000 )<<8;
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z = aSig>>( - shiftCount );
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if ( (uint32_t) ( aSig<<( shiftCount & 31 ) ) ) {
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status->float_exception_flags |= float_flag_inexact;
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}
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if ( aSign ) {
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z = - z;
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}
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return z;
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit two's complement integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic---which means in particular that the conversion is rounded
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| according to the current rounding mode. If `a' is a NaN, the largest
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| positive integer is returned. Otherwise, if the conversion overflows, the
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| largest integer with the same sign as `a' is returned.
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*----------------------------------------------------------------------------*/
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int64_t float32_to_int64(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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uint64_t aSig64, aSigExtra;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac( a );
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aExp = extractFloat32Exp( a );
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aSign = extractFloat32Sign( a );
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shiftCount = 0xBE - aExp;
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if ( shiftCount < 0 ) {
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float_raise(float_flag_invalid, status);
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if ( ! aSign || ( ( aExp == 0xFF ) && aSig ) ) {
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return LIT64( 0x7FFFFFFFFFFFFFFF );
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}
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return (int64_t) LIT64( 0x8000000000000000 );
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}
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if ( aExp ) aSig |= 0x00800000;
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aSig64 = aSig;
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aSig64 <<= 40;
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shift64ExtraRightJamming( aSig64, 0, shiftCount, &aSig64, &aSigExtra );
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return roundAndPackInt64(aSign, aSig64, aSigExtra, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit unsigned integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic---which means in particular that the conversion is rounded
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| according to the current rounding mode. If `a' is a NaN, the largest
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| unsigned integer is returned. Otherwise, if the conversion overflows, the
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| largest unsigned integer is returned. If the 'a' is negative, the result
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| is rounded and zero is returned; values that do not round to zero will
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| raise the inexact exception flag.
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*----------------------------------------------------------------------------*/
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uint64_t float32_to_uint64(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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uint64_t aSig64, aSigExtra;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac(a);
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aExp = extractFloat32Exp(a);
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aSign = extractFloat32Sign(a);
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if ((aSign) && (aExp > 126)) {
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float_raise(float_flag_invalid, status);
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if (float32_is_any_nan(a)) {
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return LIT64(0xFFFFFFFFFFFFFFFF);
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} else {
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return 0;
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}
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}
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shiftCount = 0xBE - aExp;
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if (aExp) {
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aSig |= 0x00800000;
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}
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if (shiftCount < 0) {
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float_raise(float_flag_invalid, status);
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return LIT64(0xFFFFFFFFFFFFFFFF);
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}
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aSig64 = aSig;
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aSig64 <<= 40;
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shift64ExtraRightJamming(aSig64, 0, shiftCount, &aSig64, &aSigExtra);
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return roundAndPackUint64(aSign, aSig64, aSigExtra, status);
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit unsigned integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic, except that the conversion is always rounded toward zero. If
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| `a' is a NaN, the largest unsigned integer is returned. Otherwise, if the
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| conversion overflows, the largest unsigned integer is returned. If the
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| 'a' is negative, the result is rounded and zero is returned; values that do
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| not round to zero will raise the inexact flag.
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*----------------------------------------------------------------------------*/
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uint64_t float32_to_uint64_round_to_zero(float32 a, float_status *status)
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{
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signed char current_rounding_mode = status->float_rounding_mode;
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set_float_rounding_mode(float_round_to_zero, status);
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int64_t v = float32_to_uint64(a, status);
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set_float_rounding_mode(current_rounding_mode, status);
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return v;
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}
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/*----------------------------------------------------------------------------
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| Returns the result of converting the single-precision floating-point value
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| `a' to the 64-bit two's complement integer format. The conversion is
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| performed according to the IEC/IEEE Standard for Binary Floating-Point
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| Arithmetic, except that the conversion is always rounded toward zero. If
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| `a' is a NaN, the largest positive integer is returned. Otherwise, if the
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| conversion overflows, the largest integer with the same sign as `a' is
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| returned.
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*----------------------------------------------------------------------------*/
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int64_t float32_to_int64_round_to_zero(float32 a, float_status *status)
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{
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flag aSign;
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int aExp;
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int shiftCount;
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uint32_t aSig;
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uint64_t aSig64;
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int64_t z;
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a = float32_squash_input_denormal(a, status);
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aSig = extractFloat32Frac( a );
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||||
aExp = extractFloat32Exp( a );
|
||||
aSign = extractFloat32Sign( a );
|
||||
shiftCount = aExp - 0xBE;
|
||||
if ( 0 <= shiftCount ) {
|
||||
if ( float32_val(a) != 0xDF000000 ) {
|
||||
float_raise(float_flag_invalid, status);
|
||||
if ( ! aSign || ( ( aExp == 0xFF ) && aSig ) ) {
|
||||
return LIT64( 0x7FFFFFFFFFFFFFFF );
|
||||
}
|
||||
}
|
||||
return (int64_t) LIT64( 0x8000000000000000 );
|
||||
}
|
||||
else if ( aExp <= 0x7E ) {
|
||||
if (aExp | aSig) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
aSig64 = aSig | 0x00800000;
|
||||
aSig64 <<= 40;
|
||||
z = aSig64>>( - shiftCount );
|
||||
if ( (uint64_t) ( aSig64<<( shiftCount & 63 ) ) ) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
if ( aSign ) z = - z;
|
||||
return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the single-precision floating-point value
|
||||
|
|
@ -3558,236 +3458,6 @@ int float32_unordered_quiet(float32 a, float32 b, float_status *status)
|
|||
return 0;
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 32-bit two's complement integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic---which means in particular that the conversion is rounded
|
||||
| according to the current rounding mode. If `a' is a NaN, the largest
|
||||
| positive integer is returned. Otherwise, if the conversion overflows, the
|
||||
| largest integer with the same sign as `a' is returned.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
int32_t float64_to_int32(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig;
|
||||
a = float64_squash_input_denormal(a, status);
|
||||
|
||||
aSig = extractFloat64Frac( a );
|
||||
aExp = extractFloat64Exp( a );
|
||||
aSign = extractFloat64Sign( a );
|
||||
if ( ( aExp == 0x7FF ) && aSig ) aSign = 0;
|
||||
if ( aExp ) aSig |= LIT64( 0x0010000000000000 );
|
||||
shiftCount = 0x42C - aExp;
|
||||
if ( 0 < shiftCount ) shift64RightJamming( aSig, shiftCount, &aSig );
|
||||
return roundAndPackInt32(aSign, aSig, status);
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 32-bit two's complement integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic, except that the conversion is always rounded toward zero.
|
||||
| If `a' is a NaN, the largest positive integer is returned. Otherwise, if
|
||||
| the conversion overflows, the largest integer with the same sign as `a' is
|
||||
| returned.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
int32_t float64_to_int32_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig, savedASig;
|
||||
int32_t z;
|
||||
a = float64_squash_input_denormal(a, status);
|
||||
|
||||
aSig = extractFloat64Frac( a );
|
||||
aExp = extractFloat64Exp( a );
|
||||
aSign = extractFloat64Sign( a );
|
||||
if ( 0x41E < aExp ) {
|
||||
if ( ( aExp == 0x7FF ) && aSig ) aSign = 0;
|
||||
goto invalid;
|
||||
}
|
||||
else if ( aExp < 0x3FF ) {
|
||||
if (aExp || aSig) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
aSig |= LIT64( 0x0010000000000000 );
|
||||
shiftCount = 0x433 - aExp;
|
||||
savedASig = aSig;
|
||||
aSig >>= shiftCount;
|
||||
z = aSig;
|
||||
if ( aSign ) z = - z;
|
||||
if ( ( z < 0 ) ^ aSign ) {
|
||||
invalid:
|
||||
float_raise(float_flag_invalid, status);
|
||||
return aSign ? (int32_t) 0x80000000 : 0x7FFFFFFF;
|
||||
}
|
||||
if ( ( aSig<<shiftCount ) != savedASig ) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 16-bit two's complement integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic, except that the conversion is always rounded toward zero.
|
||||
| If `a' is a NaN, the largest positive integer is returned. Otherwise, if
|
||||
| the conversion overflows, the largest integer with the same sign as `a' is
|
||||
| returned.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
int16_t float64_to_int16_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig, savedASig;
|
||||
int32_t z;
|
||||
|
||||
aSig = extractFloat64Frac( a );
|
||||
aExp = extractFloat64Exp( a );
|
||||
aSign = extractFloat64Sign( a );
|
||||
if ( 0x40E < aExp ) {
|
||||
if ( ( aExp == 0x7FF ) && aSig ) {
|
||||
aSign = 0;
|
||||
}
|
||||
goto invalid;
|
||||
}
|
||||
else if ( aExp < 0x3FF ) {
|
||||
if ( aExp || aSig ) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
aSig |= LIT64( 0x0010000000000000 );
|
||||
shiftCount = 0x433 - aExp;
|
||||
savedASig = aSig;
|
||||
aSig >>= shiftCount;
|
||||
z = aSig;
|
||||
if ( aSign ) {
|
||||
z = - z;
|
||||
}
|
||||
if ( ( (int16_t)z < 0 ) ^ aSign ) {
|
||||
invalid:
|
||||
float_raise(float_flag_invalid, status);
|
||||
return aSign ? (int32_t) 0xffff8000 : 0x7FFF;
|
||||
}
|
||||
if ( ( aSig<<shiftCount ) != savedASig ) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return z;
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 64-bit two's complement integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic---which means in particular that the conversion is rounded
|
||||
| according to the current rounding mode. If `a' is a NaN, the largest
|
||||
| positive integer is returned. Otherwise, if the conversion overflows, the
|
||||
| largest integer with the same sign as `a' is returned.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
int64_t float64_to_int64(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig, aSigExtra;
|
||||
a = float64_squash_input_denormal(a, status);
|
||||
|
||||
aSig = extractFloat64Frac( a );
|
||||
aExp = extractFloat64Exp( a );
|
||||
aSign = extractFloat64Sign( a );
|
||||
if ( aExp ) aSig |= LIT64( 0x0010000000000000 );
|
||||
shiftCount = 0x433 - aExp;
|
||||
if ( shiftCount <= 0 ) {
|
||||
if ( 0x43E < aExp ) {
|
||||
float_raise(float_flag_invalid, status);
|
||||
if ( ! aSign
|
||||
|| ( ( aExp == 0x7FF )
|
||||
&& ( aSig != LIT64( 0x0010000000000000 ) ) )
|
||||
) {
|
||||
return LIT64( 0x7FFFFFFFFFFFFFFF );
|
||||
}
|
||||
return (int64_t) LIT64( 0x8000000000000000 );
|
||||
}
|
||||
aSigExtra = 0;
|
||||
aSig <<= - shiftCount;
|
||||
}
|
||||
else {
|
||||
shift64ExtraRightJamming( aSig, 0, shiftCount, &aSig, &aSigExtra );
|
||||
}
|
||||
return roundAndPackInt64(aSign, aSig, aSigExtra, status);
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 64-bit two's complement integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic, except that the conversion is always rounded toward zero.
|
||||
| If `a' is a NaN, the largest positive integer is returned. Otherwise, if
|
||||
| the conversion overflows, the largest integer with the same sign as `a' is
|
||||
| returned.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
int64_t float64_to_int64_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig;
|
||||
int64_t z;
|
||||
a = float64_squash_input_denormal(a, status);
|
||||
|
||||
aSig = extractFloat64Frac( a );
|
||||
aExp = extractFloat64Exp( a );
|
||||
aSign = extractFloat64Sign( a );
|
||||
if ( aExp ) aSig |= LIT64( 0x0010000000000000 );
|
||||
shiftCount = aExp - 0x433;
|
||||
if ( 0 <= shiftCount ) {
|
||||
if ( 0x43E <= aExp ) {
|
||||
if ( float64_val(a) != LIT64( 0xC3E0000000000000 ) ) {
|
||||
float_raise(float_flag_invalid, status);
|
||||
if ( ! aSign
|
||||
|| ( ( aExp == 0x7FF )
|
||||
&& ( aSig != LIT64( 0x0010000000000000 ) ) )
|
||||
) {
|
||||
return LIT64( 0x7FFFFFFFFFFFFFFF );
|
||||
}
|
||||
}
|
||||
return (int64_t) LIT64( 0x8000000000000000 );
|
||||
}
|
||||
z = aSig<<shiftCount;
|
||||
}
|
||||
else {
|
||||
if ( aExp < 0x3FE ) {
|
||||
if (aExp | aSig) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
z = aSig>>( - shiftCount );
|
||||
if ( (uint64_t) ( aSig<<( shiftCount & 63 ) ) ) {
|
||||
status->float_exception_flags |= float_flag_inexact;
|
||||
}
|
||||
}
|
||||
if ( aSign ) z = - z;
|
||||
return z;
|
||||
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
|
|
@ -7055,252 +6725,7 @@ float64 uint32_to_float64(uint32_t a, float_status *status)
|
|||
return int64_to_float64(a, status);
|
||||
}
|
||||
|
||||
uint32_t float32_to_uint32(float32 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
uint32_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float32_to_int64(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffffffff) {
|
||||
res = 0xffffffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint32_t float32_to_uint32_round_to_zero(float32 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
uint32_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float32_to_int64_round_to_zero(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffffffff) {
|
||||
res = 0xffffffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
int16_t float32_to_int16(float32 a, float_status *status)
|
||||
{
|
||||
int32_t v;
|
||||
int16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float32_to_int32(a, status);
|
||||
if (v < -0x8000) {
|
||||
res = -0x8000;
|
||||
} else if (v > 0x7fff) {
|
||||
res = 0x7fff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint16_t float32_to_uint16(float32 a, float_status *status)
|
||||
{
|
||||
int32_t v;
|
||||
uint16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float32_to_int32(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffff) {
|
||||
res = 0xffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint16_t float32_to_uint16_round_to_zero(float32 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
uint16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float32_to_int64_round_to_zero(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffff) {
|
||||
res = 0xffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint32_t float64_to_uint32(float64 a, float_status *status)
|
||||
{
|
||||
uint64_t v;
|
||||
uint32_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float64_to_uint64(a, status);
|
||||
if (v > 0xffffffff) {
|
||||
res = 0xffffffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint32_t float64_to_uint32_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
uint64_t v;
|
||||
uint32_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float64_to_uint64_round_to_zero(a, status);
|
||||
if (v > 0xffffffff) {
|
||||
res = 0xffffffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
int16_t float64_to_int16(float64 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
int16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float64_to_int32(a, status);
|
||||
if (v < -0x8000) {
|
||||
res = -0x8000;
|
||||
} else if (v > 0x7fff) {
|
||||
res = 0x7fff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint16_t float64_to_uint16(float64 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
uint16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float64_to_int32(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffff) {
|
||||
res = 0xffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
uint16_t float64_to_uint16_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
int64_t v;
|
||||
uint16_t res;
|
||||
int old_exc_flags = get_float_exception_flags(status);
|
||||
|
||||
v = float64_to_int64_round_to_zero(a, status);
|
||||
if (v < 0) {
|
||||
res = 0;
|
||||
} else if (v > 0xffff) {
|
||||
res = 0xffff;
|
||||
} else {
|
||||
return v;
|
||||
}
|
||||
set_float_exception_flags(old_exc_flags, status);
|
||||
float_raise(float_flag_invalid, status);
|
||||
return res;
|
||||
}
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Returns the result of converting the double-precision floating-point value
|
||||
| `a' to the 64-bit unsigned integer format. The conversion is
|
||||
| performed according to the IEC/IEEE Standard for Binary Floating-Point
|
||||
| Arithmetic---which means in particular that the conversion is rounded
|
||||
| according to the current rounding mode. If `a' is a NaN, the largest
|
||||
| positive integer is returned. If the conversion overflows, the
|
||||
| largest unsigned integer is returned. If 'a' is negative, the value is
|
||||
| rounded and zero is returned; negative values that do not round to zero
|
||||
| will raise the inexact exception.
|
||||
*----------------------------------------------------------------------------*/
|
||||
|
||||
uint64_t float64_to_uint64(float64 a, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
int aExp;
|
||||
int shiftCount;
|
||||
uint64_t aSig, aSigExtra;
|
||||
a = float64_squash_input_denormal(a, status);
|
||||
|
||||
aSig = extractFloat64Frac(a);
|
||||
aExp = extractFloat64Exp(a);
|
||||
aSign = extractFloat64Sign(a);
|
||||
if (aSign && (aExp > 1022)) {
|
||||
float_raise(float_flag_invalid, status);
|
||||
if (float64_is_any_nan(a)) {
|
||||
return LIT64(0xFFFFFFFFFFFFFFFF);
|
||||
} else {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
if (aExp) {
|
||||
aSig |= LIT64(0x0010000000000000);
|
||||
}
|
||||
shiftCount = 0x433 - aExp;
|
||||
if (shiftCount <= 0) {
|
||||
if (0x43E < aExp) {
|
||||
float_raise(float_flag_invalid, status);
|
||||
return LIT64(0xFFFFFFFFFFFFFFFF);
|
||||
}
|
||||
aSigExtra = 0;
|
||||
aSig <<= -shiftCount;
|
||||
} else {
|
||||
shift64ExtraRightJamming(aSig, 0, shiftCount, &aSig, &aSigExtra);
|
||||
}
|
||||
return roundAndPackUint64(aSign, aSig, aSigExtra, status);
|
||||
}
|
||||
|
||||
uint64_t float64_to_uint64_round_to_zero(float64 a, float_status *status)
|
||||
{
|
||||
signed char current_rounding_mode = status->float_rounding_mode;
|
||||
set_float_rounding_mode(float_round_to_zero, status);
|
||||
uint64_t v = float64_to_uint64(a, status);
|
||||
set_float_rounding_mode(current_rounding_mode, status);
|
||||
return v;
|
||||
}
|
||||
|
||||
#define COMPARE(s, nan_exp) \
|
||||
static inline int float ## s ## _compare_internal(float ## s a, float ## s b,\
|
||||
|
|
|
|||
|
|
@ -232,6 +232,19 @@ float16 float32_to_float16(float32, flag, float_status *status);
|
|||
float32 float16_to_float32(float16, flag, float_status *status);
|
||||
float16 float64_to_float16(float64 a, flag ieee, float_status *status);
|
||||
float64 float16_to_float64(float16 a, flag ieee, float_status *status);
|
||||
int16_t float16_to_int16(float16, float_status *status);
|
||||
uint16_t float16_to_uint16(float16 a, float_status *status);
|
||||
int16_t float16_to_int16_round_to_zero(float16, float_status *status);
|
||||
uint16_t float16_to_uint16_round_to_zero(float16 a, float_status *status);
|
||||
int32_t float16_to_int32(float16, float_status *status);
|
||||
uint32_t float16_to_uint32(float16 a, float_status *status);
|
||||
int32_t float16_to_int32_round_to_zero(float16, float_status *status);
|
||||
uint32_t float16_to_uint32_round_to_zero(float16 a, float_status *status);
|
||||
int64_t float16_to_int64(float16, float_status *status);
|
||||
uint64_t float16_to_uint64(float16 a, float_status *status);
|
||||
int64_t float16_to_int64_round_to_zero(float16, float_status *status);
|
||||
uint64_t float16_to_uint64_round_to_zero(float16 a, float_status *status);
|
||||
float16 int16_to_float16(int16_t a, float_status *status);
|
||||
|
||||
/*----------------------------------------------------------------------------
|
||||
| Software half-precision operations.
|
||||
|
|
|
|||
Loading…
Reference in New Issue