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https://github.com/reactos/reactos.git
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b85afdfd25
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
55 lines
1.2 KiB
ArmAsm
55 lines
1.2 KiB
ArmAsm
/*
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* PROJECT: ReactOS CRT library
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: x64 asm implementation of fabs
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* COPYRIGHT: Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
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*/
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/* INCLUDES ******************************************************************/
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#include <asm.inc>
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/* CODE **********************************************************************/
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.code64
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#ifdef _USE_ML
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/* fabs is not allowed as label name, so create _fabs instead and alias fabs to it */
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ALIAS <fabs> = <_fabs>
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PUBLIC _fabs
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_fabs:
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#else
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PUBLIC fabs
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fabs:
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#endif
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/* Copy parameter into rcx */
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#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
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movq rcx, xmm0
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#else
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/* Old ML64 version does not understand this form of movq and uses movd instead */
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movd rcx, xmm0
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#endif
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/* Copy into rax */
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mov rax, rcx
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/* Clear sign bit in rax */
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btr rax, 63
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/* Check for NAN */
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mov r8, HEX(7FF0000000000000)
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cmp rax, r8
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/* If it is NAN, copy original value back to rax */
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cmova rax, rcx
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#if !defined(_MSC_VER) || (_MSC_VER >= 1916)
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movq xmm0, rax
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#else
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/* Old ML64 version does not understand this form of movq and uses movd instead */
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movd xmm0, rax
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#endif
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ret
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END
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