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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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45
sdk/lib/crt/math/amd64/fabs.S
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@ -1,9 +1,8 @@
/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* PURPOSE: Implementation of fabs
* FILE: lib/sdk/crt/math/amd64/fabs.S
* PROGRAMMER: Timo Kreuzer (timo.kreuzer@reactos.org)
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: x64 asm implementation of fabs
* COPYRIGHT: Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
/* INCLUDES ******************************************************************/
@ -14,18 +13,42 @@
.code64
#ifdef _USE_ML
/* fabs is now allowed as label name, so create _fabs instead and alias fabs to it */
/* fabs is not allowed as label name, so create _fabs instead and alias fabs to it */
ALIAS <fabs> = <_fabs>
PUBLIC _fabs
_fabs:
#else
PUBLIC fabs
fabs:
#endif
UNIMPLEMENTED fabs
ret
#ifdef _USE_ML
ALIAS <fabs> = <_fabs>
/* Copy parameter into rcx */
#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
movq rcx, xmm0
#else
/* Old ML64 version does not understand this form of movq and uses movd instead */
movd rcx, xmm0
#endif
/* Copy into rax */
mov rax, rcx
/* Clear sign bit in rax */
btr rax, 63
/* Check for NAN */
mov r8, HEX(7FF0000000000000)
cmp rax, r8
/* If it is NAN, copy original value back to rax */
cmova rax, rcx
#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
movq xmm0, rax
#else
/* Old ML64 version does not understand this form of movq and uses movd instead */
movd xmm0, rax
#endif
ret
END

49
sdk/lib/crt/math/amd64/fabsf.S Normal file
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@ -0,0 +1,49 @@
/*
* PROJECT: ReactOS CRT library
* LICENSE: MIT (https://spdx.org/licenses/MIT)
* PURPOSE: x64 asm implementation of fabsf
* COPYRIGHT: Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
*/
/* INCLUDES ******************************************************************/
#include <asm.inc>
/* CODE **********************************************************************/
.code64
PUBLIC fabsf
fabsf:
/* Copy parameter into rcx */
#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
movq rcx, xmm0
#else
/* Old ML64 version does not understand this form of movq and uses movd instead */
movd rcx, xmm0
#endif
/* Copy into eax */
mov eax, ecx
/* Clear sign bit in eax */
btr eax, 31
/* Set error bit in rcx */
bts ecx, 22
/* Check for NAN */
cmp eax, HEX(7F800000)
/* If eax is NAN, copy error result to rax */
cmova eax, ecx
#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
movq xmm0, rax
#else
/* Old ML64 version does not understand this form of movq and uses movd instead */
movd xmm0, rax
#endif
ret
END