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[CRT] Implement portable + amd64 asm version of fabs/fabsf

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Note: older versions of ML64 are broken and don't understand the register form of movq.
See https://stackoverflow.com/questions/24789339/move-quadword-between-xmm-and-general-purpose-register-in-ml64
This commit is contained in:
Timo Kreuzer 2021-05-29 19:40:30 +02:00
parent 8a67170616
commit b85afdfd25
7 changed files with 149 additions and 48 deletions
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26
sdk/lib/crt/math/fabsf.c
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@ -1,8 +1,8 @@
/*
* COPYRIGHT: BSD - See COPYING.ARM in the top level directory
* PROJECT: ReactOS CRT library
* PURPOSE: Implementation of fabsf
* PROGRAMMER: Timo Kreuzer
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: Portable implementation of fabsf
* COPYRIGHT: Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
#include <math.h>
@ -13,6 +13,20 @@ __cdecl
fabsf(
_In_ float x)
{
return (float)fabs((double)x);
}
/* Load the value as uint */
unsigned int u32 = *(unsigned int*)&x;
/* Clear the sign bit */
u32 &= ~(1 << 31);
/* Check for NAN */
if (u32 > 0x7F800000)
{
/* Set error bit */
*(unsigned int*)&x |= 0x00400000;
return x;
}
/* Convert back to float */
return *(float*)&u32;
}