64 lines
1.6 KiB
Diff
64 lines
1.6 KiB
Diff
diff --git lib/igt_halffloat.c lib/igt_halffloat.c
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index 08ab05fc..e5e8a5bd 100644
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--- a/lib/igt_halffloat.c
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+++ b/lib/igt_halffloat.c
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@@ -24,6 +24,19 @@
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#include <assert.h>
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#include <math.h>
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+#include <stdbool.h>
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+
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+#ifdef HAVE_CPUID_H
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+#include <cpuid.h>
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+#else
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+#define __get_cpuid_max(x, y) 0
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+#define __cpuid(level, a, b, c, d) a = b = c = d = 0
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+#define __cpuid_count(level, count, a, b, c, d) a = b = c = d = 0
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+#endif
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+
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+#ifndef bit_F16C
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+#define bit_F16C (1 << 29)
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+#endif
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#include "igt_halffloat.h"
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#include "igt_x86.h"
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@@ -182,6 +195,20 @@ static void half_to_float_f16c(const uint16_t *h, float *f, unsigned int num)
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#pragma GCC pop_options
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+static bool f16c_is_supported(void)
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+{
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+ unsigned max = __get_cpuid_max(0, NULL);
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+ unsigned eax, ebx, ecx, edx;
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+
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+ if (max >= 1) {
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+ __cpuid(1, eax, ebx, ecx, edx);
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+
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+ if (ecx & bit_F16C)
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+ return true;
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+ }
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+ return false;
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+}
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+
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static void float_to_half(const float *f, uint16_t *h, unsigned int num)
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{
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for (int i = 0; i < num; i++)
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@@ -196,7 +223,7 @@ static void half_to_float(const uint16_t *h, float *f, unsigned int num)
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static void (*resolve_float_to_half(void))(const float *f, uint16_t *h, unsigned int num)
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{
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- if (igt_x86_features() & F16C)
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+ if (f16c_is_supported())
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return float_to_half_f16c;
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return float_to_half;
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@@ -207,7 +234,7 @@ void igt_float_to_half(const float *f, uint16_t *h, unsigned int num)
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static void (*resolve_half_to_float(void))(const uint16_t *h, float *f, unsigned int num)
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{
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- if (igt_x86_features() & F16C)
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+ if (f16c_is_supported())
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return half_to_float_f16c;
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return half_to_float;
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