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commit 27f8864bd41f0f1b61e8e947d9a030b1a0d23df9
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Thu Jun 18 05:34:15 2020 -0700
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x86: Update F16C detection [BZ #26133]
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Since F16C requires AVX, set F16C usable only when AVX is usable.
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diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
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index 2a801e1856cfe1b3..37619c93f8dbcc5d 100644
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--- a/sysdeps/x86/cpu-features.c
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+++ b/sysdeps/x86/cpu-features.c
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@@ -146,6 +146,10 @@ get_common_indices (struct cpu_features *cpu_features,
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if (CPU_FEATURES_CPU_P (cpu_features, XOP))
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cpu_features->feature[index_arch_XOP_Usable]
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|= bit_arch_XOP_Usable;
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+ /* Determine if F16C is usable. */
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+ if (CPU_FEATURES_CPU_P (cpu_features, F16C))
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+ cpu_features->feature[index_arch_F16C_Usable]
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+ |= bit_arch_F16C_Usable;
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}
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/* Check if OPMASK state, upper 256-bit of ZMM0-ZMM15 and
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diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
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index 7abfa046c4b8f6ac..f18f7520fcb7714a 100644
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--- a/sysdeps/x86/cpu-features.h
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+++ b/sysdeps/x86/cpu-features.h
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@@ -142,6 +142,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define bit_arch_VPCLMULQDQ_Usable (1u << 20)
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#define bit_arch_XOP_Usable (1u << 21)
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#define bit_arch_XSAVEC_Usable (1u << 22)
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+#define bit_arch_F16C_Usable (1u << 23)
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#define index_arch_AVX_Usable FEATURE_INDEX_1
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#define index_arch_AVX2_Usable FEATURE_INDEX_1
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@@ -166,6 +167,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define index_arch_VPCLMULQDQ_Usable FEATURE_INDEX_1
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#define index_arch_XOP_Usable FEATURE_INDEX_1
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#define index_arch_XSAVEC_Usable FEATURE_INDEX_1
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+#define index_arch_F16C_Usable FEATURE_INDEX_1
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/* Unused. Compiler will optimize them out. */
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#define bit_arch_SSE3_Usable (1u << 0)
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@@ -179,7 +181,6 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define bit_arch_AES_Usable (1u << 0)
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#define bit_arch_XSAVE_Usable (1u << 0)
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#define bit_arch_OSXSAVE_Usable (1u << 0)
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-#define bit_arch_F16C_Usable (1u << 0)
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#define bit_arch_RDRAND_Usable (1u << 0)
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#define bit_arch_FPU_Usable (1u << 0)
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#define bit_arch_TSC_Usable (1u << 0)
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@@ -236,7 +237,6 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define index_arch_AES_Usable FEATURE_INDEX_1
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#define index_arch_XSAVE_Usable FEATURE_INDEX_1
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#define index_arch_OSXSAVE_Usable FEATURE_INDEX_1
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-#define index_arch_F16C_Usable FEATURE_INDEX_1
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#define index_arch_RDRAND_Usable FEATURE_INDEX_1
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#define index_arch_FPU_Usable FEATURE_INDEX_1
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#define index_arch_TSC_Usable FEATURE_INDEX_1
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@@ -296,7 +296,7 @@ extern const struct cpu_features *__get_cpu_features (void)
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#define need_arch_feature_XSAVE 0
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#define need_arch_feature_OSXSAVE 0
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#define need_arch_feature_AVX 1
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-#define need_arch_feature_F16C 0
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+#define need_arch_feature_F16C 1
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#define need_arch_feature_RDRAND 0
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/* EDX. */
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