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37 lines
780 B
C
37 lines
780 B
C
//
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// os/unix/x86_64/fpu/fpu_cmp_ole_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 <emmintrin.h>
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#include <string.h>
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static inline uint8_t fpu_cmp_ole_64(
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const uint64_t *fs, const uint64_t *ft) {
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double fs_double, ft_double;
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__m128d fs_reg, ft_reg;
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uint8_t condition;
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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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__asm__ __volatile__(
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"comisd %1, %2\n\t"
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"setae %%dl\n\t"
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"setnp %%al\n\t"
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"and %%dl, %%al\n\t"
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: "=a" (condition)
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: "x" (fs_reg),
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"x" (ft_reg)
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: "dl", "cc"
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);
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return condition;
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}
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