This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
[PATCH]: BZ #14648: Define HAS_FMA with bit_FMA_Usable
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 1 Oct 2012 08:13:11 -0700
- Subject: [PATCH]: BZ #14648: Define HAS_FMA with bit_FMA_Usable
Hi,
This patch properly detects FMA support and defines HAS_FMA with
bit_FMA_Usable. Tested on FMA machine. OK for trunk and all applicable
branches?
Thanks.
H.J.
---
sysdeps/x86_64/multiarch/init-arch.c | 3 +++
sysdeps/x86_64/multiarch/init-arch.h | 9 +++++++--
3 files changed, 21 insertions(+), 2 deletions(-)
2012-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #14648]
* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):
Set bit_FMA_Usable if FMA is supported.
* sysdeps/x86_64/multiarch/init-arch.h (bit_FMA_Usable): New
macro.
(bit_FMA4_Usable): Updated.
(index_FMA_Usable): New macro.
(CPUID_FMA): Likewise
(HAS_FMA): Defined with bit_FMA_Usable.
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index fb44dcf..fed5ab8 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -156,6 +156,9 @@ __init_cpu_features (void)
/* Determine if AVX is usable. */
if (CPUID_AVX)
__cpu_features.feature[index_AVX_Usable] |= bit_AVX_Usable;
+ /* Determine if FMA is usable. */
+ if (CPUID_FMA)
+ __cpu_features.feature[index_FMA_Usable] |= bit_FMA_Usable;
/* Determine if FMA4 is usable. */
if (CPUID_FMA4)
__cpu_features.feature[index_FMA4_Usable] |= bit_FMA4_Usable;
diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h
index 45e2651..f33f1c8 100644
--- a/sysdeps/x86_64/multiarch/init-arch.h
+++ b/sysdeps/x86_64/multiarch/init-arch.h
@@ -22,7 +22,8 @@
#define bit_Fast_Unaligned_Load (1 << 4)
#define bit_Prefer_PMINUB_for_stringop (1 << 5)
#define bit_AVX_Usable (1 << 6)
-#define bit_FMA4_Usable (1 << 7)
+#define bit_FMA_Usable (1 << 7)
+#define bit_FMA4_Usable (1 << 8)
/* CPUID Feature flags. */
#define bit_SSE2 (1 << 26)
@@ -56,6 +57,7 @@
# define index_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
# define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE
# define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE
#else /* __ASSEMBLER__ */
@@ -131,6 +133,8 @@ extern const struct cpu_features *__get_cpu_features (void)
HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_OSXSAVE)
# define CPUID_AVX \
HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_AVX)
+# define CPUID_FMA \
+ HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_FMA)
# define CPUID_FMA4 \
HAS_CPUID_FLAG (COMMON_CPUID_INDEX_80000001, ecx, bit_FMA4)
@@ -140,7 +144,6 @@ extern const struct cpu_features *__get_cpu_features (void)
# define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSSE3)
# define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_1)
# define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_2)
-# define HAS_FMA HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_FMA)
# define index_Fast_Rep_String FEATURE_INDEX_1
# define index_Fast_Copy_Backward FEATURE_INDEX_1
@@ -148,6 +151,7 @@ extern const struct cpu_features *__get_cpu_features (void)
# define index_Prefer_SSE_for_memop FEATURE_INDEX_1
# define index_Fast_Unaligned_Load FEATURE_INDEX_1
# define index_AVX_Usable FEATURE_INDEX_1
+# define index_FMA_Usable FEATURE_INDEX_1
# define index_FMA4_Usable FEATURE_INDEX_1
# define HAS_ARCH_FEATURE(name) \
@@ -159,6 +163,7 @@ extern const struct cpu_features *__get_cpu_features (void)
# define HAS_PREFER_SSE_FOR_MEMOP HAS_ARCH_FEATURE (Prefer_SSE_for_memop)
# define HAS_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (Fast_Unaligned_Load)
# define HAS_AVX HAS_ARCH_FEATURE (AVX_Usable)
+# define HAS_FMA HAS_ARCH_FEATURE (FMA_Usable)
# define HAS_FMA4 HAS_ARCH_FEATURE (FMA4_Usable)
#endif /* __ASSEMBLER__ */
--
1.7.11.4