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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
33 lines
632 B
C
33 lines
632 B
C
/*
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* PROJECT: ReactOS CRT library
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* LICENSE: MIT (https://spdx.org/licenses/MIT)
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* PURPOSE: Portable implementation of fabsf
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* COPYRIGHT: Copyright 2021 Timo Kreuzer <timo.kreuzer@reactos.org>
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*/
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#include <math.h>
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_Check_return_
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float
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__cdecl
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fabsf(
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_In_ float x)
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{
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/* Load the value as uint */
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unsigned int u32 = *(unsigned int*)&x;
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/* Clear the sign bit */
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u32 &= ~(1 << 31);
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/* Check for NAN */
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if (u32 > 0x7F800000)
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{
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/* Set error bit */
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*(unsigned int*)&x |= 0x00400000;
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return x;
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}
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/* Convert back to float */
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return *(float*)&u32;
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}
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