mirror of https://gitee.com/openkylin/qemu.git
535 lines
12 KiB
C
535 lines
12 KiB
C
/* Native implementation of soft float functions. Only a single status
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context is supported */
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#include "softfloat.h"
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#include <math.h>
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#if defined(CONFIG_SOLARIS)
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#include <fenv.h>
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#endif
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void set_float_rounding_mode(int val STATUS_PARAM)
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{
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STATUS(float_rounding_mode) = val;
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#if defined(CONFIG_BSD) && !defined(__APPLE__) || \
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(defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10)
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fpsetround(val);
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#elif defined(__arm__)
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/* nothing to do */
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#else
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fesetround(val);
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#endif
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}
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#ifdef FLOATX80
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void set_floatx80_rounding_precision(int val STATUS_PARAM)
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{
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STATUS(floatx80_rounding_precision) = val;
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}
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#endif
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#if defined(CONFIG_BSD) || \
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(defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10)
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#define lrint(d) ((int32_t)rint(d))
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#define llrint(d) ((int64_t)rint(d))
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#define lrintf(f) ((int32_t)rint(f))
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#define llrintf(f) ((int64_t)rint(f))
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#define sqrtf(f) ((float)sqrt(f))
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#define remainderf(fa, fb) ((float)remainder(fa, fb))
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#define rintf(f) ((float)rint(f))
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#if !defined(__sparc__) && \
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(defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10)
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extern long double rintl(long double);
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extern long double scalbnl(long double, int);
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long long
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llrintl(long double x) {
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return ((long long) rintl(x));
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}
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long
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lrintl(long double x) {
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return ((long) rintl(x));
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}
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long double
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ldexpl(long double x, int n) {
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return (scalbnl(x, n));
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}
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#endif
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#endif
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#if defined(_ARCH_PPC)
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/* correct (but slow) PowerPC rint() (glibc version is incorrect) */
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static double qemu_rint(double x)
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{
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double y = 4503599627370496.0;
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if (fabs(x) >= y)
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return x;
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if (x < 0)
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y = -y;
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y = (x + y) - y;
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if (y == 0.0)
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y = copysign(y, x);
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return y;
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}
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#define rint qemu_rint
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#endif
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE integer-to-floating-point conversion routines.
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*----------------------------------------------------------------------------*/
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float32 int32_to_float32(int v STATUS_PARAM)
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{
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return (float32)v;
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}
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float32 uint32_to_float32(unsigned int v STATUS_PARAM)
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{
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return (float32)v;
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}
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float64 int32_to_float64(int v STATUS_PARAM)
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{
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return (float64)v;
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}
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float64 uint32_to_float64(unsigned int v STATUS_PARAM)
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{
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return (float64)v;
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}
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#ifdef FLOATX80
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floatx80 int32_to_floatx80(int v STATUS_PARAM)
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{
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return (floatx80)v;
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}
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#endif
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float32 int64_to_float32( int64_t v STATUS_PARAM)
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{
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return (float32)v;
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}
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float32 uint64_to_float32( uint64_t v STATUS_PARAM)
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{
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return (float32)v;
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}
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float64 int64_to_float64( int64_t v STATUS_PARAM)
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{
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return (float64)v;
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}
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float64 uint64_to_float64( uint64_t v STATUS_PARAM)
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{
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return (float64)v;
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}
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#ifdef FLOATX80
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floatx80 int64_to_floatx80( int64_t v STATUS_PARAM)
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{
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return (floatx80)v;
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}
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#endif
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/* XXX: this code implements the x86 behaviour, not the IEEE one. */
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#if HOST_LONG_BITS == 32
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static inline int long_to_int32(long a)
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{
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return a;
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}
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#else
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static inline int long_to_int32(long a)
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{
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if (a != (int32_t)a)
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a = 0x80000000;
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return a;
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}
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#endif
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int float32_to_int32( float32 a STATUS_PARAM)
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{
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return long_to_int32(lrintf(a));
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}
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int float32_to_int32_round_to_zero( float32 a STATUS_PARAM)
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{
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return (int)a;
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}
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int64_t float32_to_int64( float32 a STATUS_PARAM)
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{
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return llrintf(a);
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}
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int64_t float32_to_int64_round_to_zero( float32 a STATUS_PARAM)
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{
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return (int64_t)a;
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}
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float64 float32_to_float64( float32 a STATUS_PARAM)
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{
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return a;
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}
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#ifdef FLOATX80
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floatx80 float32_to_floatx80( float32 a STATUS_PARAM)
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{
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return a;
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}
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#endif
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unsigned int float32_to_uint32( float32 a STATUS_PARAM)
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{
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int64_t v;
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unsigned int res;
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v = llrintf(a);
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if (v < 0) {
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res = 0;
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} else if (v > 0xffffffff) {
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res = 0xffffffff;
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} else {
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res = v;
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}
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return res;
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}
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unsigned int float32_to_uint32_round_to_zero( float32 a STATUS_PARAM)
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{
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int64_t v;
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unsigned int res;
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v = (int64_t)a;
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if (v < 0) {
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res = 0;
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} else if (v > 0xffffffff) {
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res = 0xffffffff;
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} else {
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res = v;
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}
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return res;
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}
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE single-precision operations.
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*----------------------------------------------------------------------------*/
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float32 float32_round_to_int( float32 a STATUS_PARAM)
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{
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return rintf(a);
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}
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float32 float32_rem( float32 a, float32 b STATUS_PARAM)
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{
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return remainderf(a, b);
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}
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float32 float32_sqrt( float32 a STATUS_PARAM)
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{
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return sqrtf(a);
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}
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int float32_compare( float32 a, float32 b STATUS_PARAM )
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{
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if (a < b) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (a > b) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int float32_compare_quiet( float32 a, float32 b STATUS_PARAM )
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{
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if (isless(a, b)) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (isgreater(a, b)) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int float32_is_signaling_nan( float32 a1)
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{
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float32u u;
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uint32_t a;
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u.f = a1;
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a = u.i;
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return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
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}
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int float32_is_nan( float32 a1 )
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{
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float32u u;
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uint64_t a;
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u.f = a1;
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a = u.i;
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return ( 0xFF800000 < ( a<<1 ) );
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}
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int float64_to_int32( float64 a STATUS_PARAM)
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{
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return long_to_int32(lrint(a));
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}
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int float64_to_int32_round_to_zero( float64 a STATUS_PARAM)
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{
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return (int)a;
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}
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int64_t float64_to_int64( float64 a STATUS_PARAM)
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{
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return llrint(a);
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}
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int64_t float64_to_int64_round_to_zero( float64 a STATUS_PARAM)
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{
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return (int64_t)a;
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}
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float32 float64_to_float32( float64 a STATUS_PARAM)
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{
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return a;
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}
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#ifdef FLOATX80
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floatx80 float64_to_floatx80( float64 a STATUS_PARAM)
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{
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return a;
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}
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#endif
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#ifdef FLOAT128
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float128 float64_to_float128( float64 a STATUS_PARAM)
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{
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return a;
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}
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#endif
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unsigned int float64_to_uint32( float64 a STATUS_PARAM)
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{
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int64_t v;
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unsigned int res;
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v = llrint(a);
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if (v < 0) {
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res = 0;
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} else if (v > 0xffffffff) {
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res = 0xffffffff;
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} else {
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res = v;
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}
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return res;
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}
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unsigned int float64_to_uint32_round_to_zero( float64 a STATUS_PARAM)
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{
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int64_t v;
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unsigned int res;
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v = (int64_t)a;
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if (v < 0) {
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res = 0;
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} else if (v > 0xffffffff) {
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res = 0xffffffff;
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} else {
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res = v;
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}
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return res;
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}
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uint64_t float64_to_uint64 (float64 a STATUS_PARAM)
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{
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int64_t v;
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v = llrint(a + (float64)INT64_MIN);
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return v - INT64_MIN;
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}
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uint64_t float64_to_uint64_round_to_zero (float64 a STATUS_PARAM)
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{
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int64_t v;
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v = (int64_t)(a + (float64)INT64_MIN);
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return v - INT64_MIN;
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}
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE double-precision operations.
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*----------------------------------------------------------------------------*/
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#if defined(__sun__) && \
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(defined(CONFIG_SOLARIS) && CONFIG_SOLARIS_VERSION < 10)
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static inline float64 trunc(float64 x)
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{
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return x < 0 ? -floor(-x) : floor(x);
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}
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#endif
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float64 float64_trunc_to_int( float64 a STATUS_PARAM )
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{
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return trunc(a);
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}
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float64 float64_round_to_int( float64 a STATUS_PARAM )
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{
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#if defined(__arm__)
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switch(STATUS(float_rounding_mode)) {
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default:
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case float_round_nearest_even:
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asm("rndd %0, %1" : "=f" (a) : "f"(a));
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break;
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case float_round_down:
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asm("rnddm %0, %1" : "=f" (a) : "f"(a));
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break;
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case float_round_up:
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asm("rnddp %0, %1" : "=f" (a) : "f"(a));
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break;
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case float_round_to_zero:
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asm("rnddz %0, %1" : "=f" (a) : "f"(a));
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break;
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}
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#else
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return rint(a);
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#endif
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}
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float64 float64_rem( float64 a, float64 b STATUS_PARAM)
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{
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return remainder(a, b);
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}
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float64 float64_sqrt( float64 a STATUS_PARAM)
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{
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return sqrt(a);
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}
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int float64_compare( float64 a, float64 b STATUS_PARAM )
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{
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if (a < b) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (a > b) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int float64_compare_quiet( float64 a, float64 b STATUS_PARAM )
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{
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if (isless(a, b)) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (isgreater(a, b)) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int float64_is_signaling_nan( float64 a1)
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{
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float64u u;
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uint64_t a;
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u.f = a1;
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a = u.i;
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return
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( ( ( a>>51 ) & 0xFFF ) == 0xFFE )
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&& ( a & LIT64( 0x0007FFFFFFFFFFFF ) );
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}
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int float64_is_nan( float64 a1 )
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{
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float64u u;
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uint64_t a;
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u.f = a1;
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a = u.i;
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return ( LIT64( 0xFFF0000000000000 ) < (bits64) ( a<<1 ) );
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}
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#ifdef FLOATX80
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision conversion routines.
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*----------------------------------------------------------------------------*/
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int floatx80_to_int32( floatx80 a STATUS_PARAM)
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{
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return long_to_int32(lrintl(a));
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}
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int floatx80_to_int32_round_to_zero( floatx80 a STATUS_PARAM)
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{
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return (int)a;
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}
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int64_t floatx80_to_int64( floatx80 a STATUS_PARAM)
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{
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return llrintl(a);
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}
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int64_t floatx80_to_int64_round_to_zero( floatx80 a STATUS_PARAM)
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{
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return (int64_t)a;
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}
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float32 floatx80_to_float32( floatx80 a STATUS_PARAM)
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{
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return a;
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}
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float64 floatx80_to_float64( floatx80 a STATUS_PARAM)
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{
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return a;
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}
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/*----------------------------------------------------------------------------
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| Software IEC/IEEE extended double-precision operations.
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*----------------------------------------------------------------------------*/
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floatx80 floatx80_round_to_int( floatx80 a STATUS_PARAM)
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{
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return rintl(a);
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}
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floatx80 floatx80_rem( floatx80 a, floatx80 b STATUS_PARAM)
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{
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return remainderl(a, b);
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}
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floatx80 floatx80_sqrt( floatx80 a STATUS_PARAM)
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{
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return sqrtl(a);
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}
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int floatx80_compare( floatx80 a, floatx80 b STATUS_PARAM )
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{
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if (a < b) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (a > b) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int floatx80_compare_quiet( floatx80 a, floatx80 b STATUS_PARAM )
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{
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if (isless(a, b)) {
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return float_relation_less;
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} else if (a == b) {
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return float_relation_equal;
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} else if (isgreater(a, b)) {
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return float_relation_greater;
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} else {
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return float_relation_unordered;
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}
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}
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int floatx80_is_signaling_nan( floatx80 a1)
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{
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floatx80u u;
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uint64_t aLow;
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u.f = a1;
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aLow = u.i.low & ~ LIT64( 0x4000000000000000 );
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return
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( ( u.i.high & 0x7FFF ) == 0x7FFF )
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&& (bits64) ( aLow<<1 )
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&& ( u.i.low == aLow );
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}
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int floatx80_is_nan( floatx80 a1 )
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{
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floatx80u u;
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u.f = a1;
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return ( ( u.i.high & 0x7FFF ) == 0x7FFF ) && (bits64) ( u.i.low<<1 );
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}
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#endif
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