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29 lines
718 B
C
29 lines
718 B
C
//
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// arch/x86_64/fpu/sub_64.h
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//
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// This file is subject to the terms and conditions defined in
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// 'LICENSE', which is part of this source code package.
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//
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#include "common.h"
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#include <emmintrin.h>
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#include <string.h>
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static inline void fpu_sub_64(
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const uint64_t *fs, const uint64_t *ft, uint64_t *fd) {
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double fs_double, ft_double, fd_double;
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__m128d fs_reg, ft_reg, fd_reg;
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// Prevent aliasing.
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memcpy(&fs_double, fs, sizeof(fs_double));
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memcpy(&ft_double, ft, sizeof(ft_double));
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fs_reg = _mm_set_sd(fs_double);
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ft_reg = _mm_set_sd(ft_double);
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fd_reg = _mm_sub_sd(fs_reg, ft_reg);
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fd_double = _mm_cvtsd_f64(fd_reg);
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// Prevent aliasing.
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memcpy(fd, &fd_double, sizeof(fd_double));
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}
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