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msvcrt: Reimplement _dclass() using musl code. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2020-11-16 12:09:43 +01:00
parent 52dc0ccf6d
commit 23008a0f27
1 changed files with 17 additions and 20 deletions
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37
dlls/msvcrt/math.c
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@ -3678,35 +3678,32 @@ LDOUBLE CDECL MSVCR120_truncl(LDOUBLE x)
/*********************************************************************
* _dclass (MSVCR120.@)
*
* Copied from musl: src/math/__fpclassify.c
*/
short CDECL MSVCR120__dclass(double x)
{
switch (MSVCRT__fpclass(x)) {
case MSVCRT__FPCLASS_QNAN:
case MSVCRT__FPCLASS_SNAN:
return MSVCRT_FP_NAN;
case MSVCRT__FPCLASS_NINF:
case MSVCRT__FPCLASS_PINF:
return MSVCRT_FP_INFINITE;
case MSVCRT__FPCLASS_ND:
case MSVCRT__FPCLASS_PD:
return MSVCRT_FP_SUBNORMAL;
case MSVCRT__FPCLASS_NN:
case MSVCRT__FPCLASS_PN:
default:
return MSVCRT_FP_NORMAL;
case MSVCRT__FPCLASS_NZ:
case MSVCRT__FPCLASS_PZ:
return MSVCRT_FP_ZERO;
}
union { double f; UINT64 i; } u = { x };
int e = u.i >> 52 & 0x7ff;
if (!e) return u.i << 1 ? MSVCRT_FP_SUBNORMAL : MSVCRT_FP_ZERO;
if (e == 0x7ff) return (u.i << 12) ? MSVCRT_FP_NAN : MSVCRT_FP_INFINITE;
return MSVCRT_FP_NORMAL;
}
/*********************************************************************
* _fdclass (MSVCR120.@)
*
* Copied from musl: src/math/__fpclassifyf.c
*/
short CDECL MSVCR120__fdclass(float x)
{
return MSVCR120__dclass(x);
union { float f; UINT32 i; } u = { x };
int e = u.i >> 23 & 0xff;
if (!e) return u.i << 1 ? MSVCRT_FP_SUBNORMAL : MSVCRT_FP_ZERO;
if (e == 0xff) return u.i << 9 ? MSVCRT_FP_NAN : MSVCRT_FP_INFINITE;
return MSVCRT_FP_NORMAL;
}
/*********************************************************************
@ -3730,7 +3727,7 @@ short CDECL MSVCR120__dtest(double *x)
*/
short CDECL MSVCR120__fdtest(float *x)
{
return MSVCR120__dclass(*x);
return MSVCR120__fdclass(*x);
}
/*********************************************************************