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msvcrt: Improve sqrt accuracy and performance on i386. 

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Piotr Caban 2021-02-01 20:47:14 +01:00 committed by Alexandre Julliard
parent e53c4bd509
commit ba3cc1274d
1 changed files with 36 additions and 0 deletions
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36
dlls/msvcrt/math.c
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@ -1202,6 +1202,37 @@ __ASM_GLOBAL_FUNC( sse2_sqrt,
"ret" )
#endif
#ifdef __i386__
#define SET_X87_CW \
"subl $4, %esp\n\t" \
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t") \
"fnstcw (%esp)\n\t" \
"movw (%esp), %ax\n\t" \
"testw $0xc00, %ax\n\t" \
"jz 1f\n\t" \
"andw $0xf3ff, %ax\n\t" \
"movw %ax, 2(%esp)\n\t" \
"fldcw 2(%esp)\n\t" \
"1:\n\t"
#define RESET_X87_CW \
"movw (%esp), %ax\n\t" \
"testw $0xc00, %ax\n\t" \
"jz 1f\n\t" \
"fldcw (%esp)\n\t" \
"1:\n\t" \
"addl $4, %esp\n\t" \
__ASM_CFI(".cfi_adjust_cfa_offset -4\n\t")
double CDECL x87_sqrt(double);
__ASM_GLOBAL_FUNC( x87_sqrt,
"fldl 4(%esp)\n\t"
SET_X87_CW
"fsqrt\n\t"
RESET_X87_CW
"ret" )
#endif
/*********************************************************************
* sqrt (MSVCRT.@)
*
@ -1214,6 +1245,11 @@ double CDECL sqrt( double x )
return x;
return sse2_sqrt(x);
#elif defined( __i386__ )
if (!sqrt_validate(&x))
return x;
return x87_sqrt(x);
#else
static const double tiny = 1.0e-300;