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win32 tcc_libm.h: Implemented overrides for msvcrt.dll's frexp(), ldexp(), and fabs() with speedups 4.5X, 7.3X and 6.3X correspondingly.

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This is the last commit on this for now.
This commit is contained in:
Tyge Løvset 2020-11-25 14:29:42 +01:00
parent 4a42b0d95e
commit 13a18906ef
1 changed files with 29 additions and 6 deletions
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35
win32/include/tcc/tcc_libm.h
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@ -232,6 +232,23 @@ __CRT_INLINE double __cdecl scalbn(double x, int n) {
return x * u.f;
}
/* MUSL: Override msvcrt frexp(): 4.5x speedup! */
__CRT_INLINE double __cdecl frexp(double x, int *e) {
union {double f; uint64_t i;} u = {.f = x};
int ee = u.i>>52 & 0x7ff;
if (!ee) {
if (x) x = frexp(x*0x1p64, e), *e -= 64;
else *e = 0;
return x;
} else if (ee == 0x7ff)
return x;
*e = ee - 0x3fe;
u.i &= 0x800fffffffffffffull;
u.i |= 0x3fe0000000000000ull;
return u.f;
}
/* MUSL nan */
__CRT_INLINE double __cdecl nan(const char* s) {
@ -273,7 +290,11 @@ __CRT_INLINE long double __cdecl scalblnl(long double x, long n) {
return scalbn(x, n);
}
/* Override msvcrt ldexp(): 7.3x speedup! */
__CRT_INLINE double __cdecl ldexp(double x, int expn) {
return scalbn(x, expn);
}
__CRT_INLINE float __cdecl ldexpf(float x, int expn) {
return scalbn(x, expn);
}
@ -391,14 +412,16 @@ __CRT_INLINE long double __cdecl nexttowardl(long double x, long double to) {
return nextafter(x, to);
}
/* Override msvcrt fabs(): 6.3x speedup! */
__CRT_INLINE float __cdecl fabsf (float x) {
union {float f; uint32_t i;} u = {.f = x};
u.i &= 0x7fffffff; return u.f;
__CRT_INLINE double __cdecl fabs(double x) {
return x < 0 ? -x : x;
}
__CRT_INLINE long double __cdecl fabsl (long double x) {
union {double f; uint64_t i;} u = {.f = x};
u.i &= 0x7fffffffffffffff; return u.f;
__CRT_INLINE float __cdecl fabsf(float x) {
return x < 0 ? -x : x;
}
__CRT_INLINE long double __cdecl fabsl(long double x) {
return x < 0 ? -x : x;
}