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softfloat: Move compare_floats to softfloat-parts.c.inc 

Rename to parts$N_compare.  Rename all of the intermediate
functions to ftype_do_compare.  Rename the hard-float functions
to ftype_hs_compare.  Convert float128 to FloatParts128.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-14 19:20:36 -08:00
parent ceebc129e5
commit 6eb169b89a
2 changed files with 133 additions and 132 deletions
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57
fpu/softfloat-parts.c.inc
View File

@ -1018,3 +1018,60 @@ static FloatPartsN *partsN(minmax)(FloatPartsN *a, FloatPartsN *b,
}
return cmp < 0 ? b : a;
}
/*
* Floating point compare
*/
static FloatRelation partsN(compare)(FloatPartsN *a, FloatPartsN *b,
float_status *s, bool is_quiet)
{
int ab_mask = float_cmask(a->cls) | float_cmask(b->cls);
int cmp;
if (likely(ab_mask == float_cmask_normal)) {
if (a->sign != b->sign) {
goto a_sign;
}
if (a->exp != b->exp) {
cmp = a->exp < b->exp ? -1 : 1;
} else {
cmp = frac_cmp(a, b);
}
if (a->sign) {
cmp = -cmp;
}
return cmp;
}
if (unlikely(ab_mask & float_cmask_anynan)) {
if (!is_quiet || (ab_mask & float_cmask_snan)) {
float_raise(float_flag_invalid, s);
}
return float_relation_unordered;
}
if (ab_mask & float_cmask_zero) {
if (ab_mask == float_cmask_zero) {
return float_relation_equal;
} else if (a->cls == float_class_zero) {
goto b_sign;
} else {
goto a_sign;
}
}
if (ab_mask == float_cmask_inf) {
if (a->sign == b->sign) {
return float_relation_equal;
}
} else if (b->cls == float_class_inf) {
goto b_sign;
} else {
g_assert(a->cls == float_class_inf);
}
a_sign:
return a->sign ? float_relation_less : float_relation_greater;
b_sign:
return b->sign ? float_relation_greater : float_relation_less;
}

206
fpu/softfloat.c
View File

@ -882,6 +882,14 @@ static FloatParts128 *parts128_minmax(FloatParts128 *a, FloatParts128 *b,
#define parts_minmax(A, B, S, F) \
PARTS_GENERIC_64_128(minmax, A)(A, B, S, F)
static int parts64_compare(FloatParts64 *a, FloatParts64 *b,
float_status *s, bool q);
static int parts128_compare(FloatParts128 *a, FloatParts128 *b,
float_status *s, bool q);
#define parts_compare(A, B, S, Q) \
PARTS_GENERIC_64_128(compare, A)(A, B, S, Q)
/*
* Helper functions for softfloat-parts.c.inc, per-size operations.
*/
@ -3357,92 +3365,42 @@ MINMAX_2(float128)
#undef MINMAX_1
#undef MINMAX_2
/* Floating point compare */
static FloatRelation compare_floats(FloatParts64 a, FloatParts64 b, bool is_quiet,
float_status *s)
{
if (is_nan(a.cls) || is_nan(b.cls)) {
if (!is_quiet ||
a.cls == float_class_snan ||
b.cls == float_class_snan) {
float_raise(float_flag_invalid, s);
}
return float_relation_unordered;
}
if (a.cls == float_class_zero) {
if (b.cls == float_class_zero) {
return float_relation_equal;
}
return b.sign ? float_relation_greater : float_relation_less;
} else if (b.cls == float_class_zero) {
return a.sign ? float_relation_less : float_relation_greater;
}
/* The only really important thing about infinity is its sign. If
* both are infinities the sign marks the smallest of the two.
/*
* Floating point compare
*/
if (a.cls == float_class_inf) {
if ((b.cls == float_class_inf) && (a.sign == b.sign)) {
return float_relation_equal;
}
return a.sign ? float_relation_less : float_relation_greater;
} else if (b.cls == float_class_inf) {
return b.sign ? float_relation_greater : float_relation_less;
}
if (a.sign != b.sign) {
return a.sign ? float_relation_less : float_relation_greater;
}
static FloatRelation QEMU_FLATTEN
float16_do_compare(float16 a, float16 b, float_status *s, bool is_quiet)
{
FloatParts64 pa, pb;
if (a.exp == b.exp) {
if (a.frac == b.frac) {
return float_relation_equal;
float16_unpack_canonical(&pa, a, s);
float16_unpack_canonical(&pb, b, s);
return parts_compare(&pa, &pb, s, is_quiet);
}
if (a.sign) {
return a.frac > b.frac ?
float_relation_less : float_relation_greater;
} else {
return a.frac > b.frac ?
float_relation_greater : float_relation_less;
}
} else {
if (a.sign) {
return a.exp > b.exp ? float_relation_less : float_relation_greater;
} else {
return a.exp > b.exp ? float_relation_greater : float_relation_less;
}
}
}
#define COMPARE(name, attr, sz) \
static int attr \
name(float ## sz a, float ## sz b, bool is_quiet, float_status *s) \
{ \
FloatParts64 pa, pb; \
float ## sz ## _unpack_canonical(&pa, a, s); \
float ## sz ## _unpack_canonical(&pb, b, s); \
return compare_floats(pa, pb, is_quiet, s); \
}
COMPARE(soft_f16_compare, QEMU_FLATTEN, 16)
COMPARE(soft_f32_compare, QEMU_SOFTFLOAT_ATTR, 32)
COMPARE(soft_f64_compare, QEMU_SOFTFLOAT_ATTR, 64)
#undef COMPARE
FloatRelation float16_compare(float16 a, float16 b, float_status *s)
{
return soft_f16_compare(a, b, false, s);
return float16_do_compare(a, b, s, false);
}
FloatRelation float16_compare_quiet(float16 a, float16 b, float_status *s)
{
return soft_f16_compare(a, b, true, s);
return float16_do_compare(a, b, s, true);
}
static FloatRelation QEMU_SOFTFLOAT_ATTR
float32_do_compare(float32 a, float32 b, float_status *s, bool is_quiet)
{
FloatParts64 pa, pb;
float32_unpack_canonical(&pa, a, s);
float32_unpack_canonical(&pb, b, s);
return parts_compare(&pa, &pb, s, is_quiet);
}
static FloatRelation QEMU_FLATTEN
f32_compare(float32 xa, float32 xb, bool is_quiet, float_status *s)
float32_hs_compare(float32 xa, float32 xb, float_status *s, bool is_quiet)
{
union_float32 ua, ub;
@ -3463,25 +3421,36 @@ f32_compare(float32 xa, float32 xb, bool is_quiet, float_status *s)
if (likely(isless(ua.h, ub.h))) {
return float_relation_less;
}
/* The only condition remaining is unordered.
/*
* The only condition remaining is unordered.
* Fall through to set flags.
*/
soft:
return soft_f32_compare(ua.s, ub.s, is_quiet, s);
return float32_do_compare(ua.s, ub.s, s, is_quiet);
}
FloatRelation float32_compare(float32 a, float32 b, float_status *s)
{
return f32_compare(a, b, false, s);
return float32_hs_compare(a, b, s, false);
}
FloatRelation float32_compare_quiet(float32 a, float32 b, float_status *s)
{
return f32_compare(a, b, true, s);
return float32_hs_compare(a, b, s, true);
}
static FloatRelation QEMU_SOFTFLOAT_ATTR
float64_do_compare(float64 a, float64 b, float_status *s, bool is_quiet)
{
FloatParts64 pa, pb;
float64_unpack_canonical(&pa, a, s);
float64_unpack_canonical(&pb, b, s);
return parts_compare(&pa, &pb, s, is_quiet);
}
static FloatRelation QEMU_FLATTEN
f64_compare(float64 xa, float64 xb, bool is_quiet, float_status *s)
float64_hs_compare(float64 xa, float64 xb, float_status *s, bool is_quiet)
{
union_float64 ua, ub;
@ -3502,41 +3471,62 @@ f64_compare(float64 xa, float64 xb, bool is_quiet, float_status *s)
if (likely(isless(ua.h, ub.h))) {
return float_relation_less;
}
/* The only condition remaining is unordered.
/*
* The only condition remaining is unordered.
* Fall through to set flags.
*/
soft:
return soft_f64_compare(ua.s, ub.s, is_quiet, s);
return float64_do_compare(ua.s, ub.s, s, is_quiet);
}
FloatRelation float64_compare(float64 a, float64 b, float_status *s)
{
return f64_compare(a, b, false, s);
return float64_hs_compare(a, b, s, false);
}
FloatRelation float64_compare_quiet(float64 a, float64 b, float_status *s)
{
return f64_compare(a, b, true, s);
return float64_hs_compare(a, b, s, true);
}
static FloatRelation QEMU_FLATTEN
soft_bf16_compare(bfloat16 a, bfloat16 b, bool is_quiet, float_status *s)
bfloat16_do_compare(bfloat16 a, bfloat16 b, float_status *s, bool is_quiet)
{
FloatParts64 pa, pb;
bfloat16_unpack_canonical(&pa, a, s);
bfloat16_unpack_canonical(&pb, b, s);
return compare_floats(pa, pb, is_quiet, s);
return parts_compare(&pa, &pb, s, is_quiet);
}
FloatRelation bfloat16_compare(bfloat16 a, bfloat16 b, float_status *s)
{
return soft_bf16_compare(a, b, false, s);
return bfloat16_do_compare(a, b, s, false);
}
FloatRelation bfloat16_compare_quiet(bfloat16 a, bfloat16 b, float_status *s)
{
return soft_bf16_compare(a, b, true, s);
return bfloat16_do_compare(a, b, s, true);
}
static FloatRelation QEMU_FLATTEN
float128_do_compare(float128 a, float128 b, float_status *s, bool is_quiet)
{
FloatParts128 pa, pb;
float128_unpack_canonical(&pa, a, s);
float128_unpack_canonical(&pb, b, s);
return parts_compare(&pa, &pb, s, is_quiet);
}
FloatRelation float128_compare(float128 a, float128 b, float_status *s)
{
return float128_do_compare(a, b, s, false);
}
FloatRelation float128_compare_quiet(float128 a, float128 b, float_status *s)
{
return float128_do_compare(a, b, s, true);
}
/* Multiply A by 2 raised to the power N. */
@ -6609,52 +6599,6 @@ FloatRelation floatx80_compare_quiet(floatx80 a, floatx80 b,
return floatx80_compare_internal(a, b, 1, status);
}
static inline FloatRelation
float128_compare_internal(float128 a, float128 b, bool is_quiet,
float_status *status)
{
bool aSign, bSign;
if (( ( extractFloat128Exp( a ) == 0x7fff ) &&
( extractFloat128Frac0( a ) | extractFloat128Frac1( a ) ) ) ||
( ( extractFloat128Exp( b ) == 0x7fff ) &&
( extractFloat128Frac0( b ) | extractFloat128Frac1( b ) ) )) {
if (!is_quiet ||
float128_is_signaling_nan(a, status) ||
float128_is_signaling_nan(b, status)) {
float_raise(float_flag_invalid, status);
}
return float_relation_unordered;
}
aSign = extractFloat128Sign( a );
bSign = extractFloat128Sign( b );
if ( aSign != bSign ) {
if ( ( ( ( a.high | b.high )<<1 ) | a.low | b.low ) == 0 ) {
/* zero case */
return float_relation_equal;
} else {
return 1 - (2 * aSign);
}
} else {
if (a.low == b.low && a.high == b.high) {
return float_relation_equal;
} else {
return 1 - 2 * (aSign ^ ( lt128( a.high, a.low, b.high, b.low ) ));
}
}
}
FloatRelation float128_compare(float128 a, float128 b, float_status *status)
{
return float128_compare_internal(a, b, 0, status);
}
FloatRelation float128_compare_quiet(float128 a, float128 b,
float_status *status)
{
return float128_compare_internal(a, b, 1, status);
}
floatx80 floatx80_scalbn(floatx80 a, int n, float_status *status)
{
bool aSign;