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msvcrt: Set mxcsr denormal flag in sqrtf if needed. 

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Piotr Caban 2021-02-05 16:06:47 +01:00 committed by Alexandre Julliard
parent 08dc5b92e0
commit 0cd71776f4
1 changed files with 53 additions and 32 deletions
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85
dlls/msvcrt/math.c
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@ -82,6 +82,13 @@ static inline float fp_barrierf(float x)
return y;
}
static inline double CDECL ret_nan( BOOL update_sw )
{
double x = 1.0;
if (!update_sw) return -NAN;
return (x - x) / (x - x);
}
/*********************************************************************
* _matherr (CRTDLL.@)
*/
@ -613,6 +620,28 @@ float CDECL sinhf( float x )
return ret;
}
static BOOL sqrtf_validate( float *x )
{
short c = _fdclass(*x);
if (c == FP_ZERO) return FALSE;
if (c == FP_NAN) return FALSE;
if (signbit(*x))
{
*x = math_error(_DOMAIN, "sqrtf", *x, 0, ret_nan(TRUE));
return FALSE;
}
if (c == FP_INFINITE) return FALSE;
return TRUE;
}
#if defined(__x86_64__) || defined(__i386__)
float CDECL sse2_sqrtf(float);
__ASM_GLOBAL_FUNC( sse2_sqrtf,
"sqrtss %xmm0, %xmm0\n\t"
"ret" )
#endif
/*********************************************************************
* sqrtf (MSVCRT.@)
*
@ -620,25 +649,23 @@ float CDECL sinhf( float x )
*/
float CDECL sqrtf( float x )
{
#ifdef __x86_64__
if (!sqrtf_validate(&x))
return x;
return sse2_sqrtf(x);
#else
static const float tiny = 1.0e-30;
float z;
int sign = 0x80000000;
int ix,s,q,m,t,i;
unsigned int r;
ix = *(int*)&x;
/* take care of Inf and NaN */
if ((ix & 0x7f800000) == 0x7f800000 && (ix == 0x7f800000 || ix & 0x7fffff))
if (!sqrtf_validate(&x))
return x;
/* take care of zero */
if (ix <= 0) {
if ((ix & ~sign) == 0)
return x; /* sqrt(+-0) = +-0 */
return math_error(_DOMAIN, "sqrtf", x, 0, (x - x) / (x - x)); /* sqrt(-ve) = sNaN */
}
/* normalize x */
m = ix >> 23;
if (m == 0) { /* subnormal x */
@ -683,6 +710,7 @@ float CDECL sqrtf( float x )
r = ix + ((unsigned int)m << 23);
z = *(float*)&r;
return z;
#endif
}
/*********************************************************************
@ -1165,14 +1193,7 @@ double CDECL sinh( double x )
return ret;
}
static inline double CDECL ret_nan( BOOL update_sw )
{
double x = 1.0;
if (!update_sw) return -NAN;
return (x - x) / (x - x);
}
BOOL sqrt_validate( double *x, BOOL update_sw )
static BOOL sqrt_validate( double *x, BOOL update_sw )
{
short c = _dclass(*x);
@ -3511,6 +3532,21 @@ __int64 CDECL llrintf(float x)
return unix_funcs->llrintf( x );
}
/*********************************************************************
* _fdclass (MSVCR120.@)
*
* Copied from musl: src/math/__fpclassifyf.c
*/
short CDECL _fdclass(float x)
{
union { float f; UINT32 i; } u = { x };
int e = u.i >> 23 & 0xff;
if (!e) return u.i << 1 ? FP_SUBNORMAL : FP_ZERO;
if (e == 0xff) return u.i << 9 ? FP_NAN : FP_INFINITE;
return FP_NORMAL;
}
/*********************************************************************
* _dclass (MSVCR120.@)
*
@ -3592,21 +3628,6 @@ float CDECL truncf(float x)
return unix_funcs->truncf(x);
}
/*********************************************************************
* _fdclass (MSVCR120.@)
*
* Copied from musl: src/math/__fpclassifyf.c
*/
short CDECL _fdclass(float x)
{
union { float f; UINT32 i; } u = { x };
int e = u.i >> 23 & 0xff;
if (!e) return u.i << 1 ? FP_SUBNORMAL : FP_ZERO;
if (e == 0xff) return u.i << 9 ? FP_NAN : FP_INFINITE;
return FP_NORMAL;
}
/*********************************************************************
* _dtest (MSVCR120.@)
*/