[PATCH] x86: Set Prefer_No_VZEROUPPER if AVX512ER is available

[H.J. Lu]

Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER if
AVX512ER is available.

Any comments?

H.J.
----
	* sysdeps/x86/cpu-features.c (init_cpu_features): Set
	Prefer_No_VZEROUPPER if AVX512ER is available.
	* sysdeps/x86/cpu-features.h
	(bit_cpu_AVX512PF): New.
	(bit_cpu_AVX512ER): Likewise.
	(bit_cpu_AVX512CD): Likewise.
	(bit_cpu_AVX512BW): Likewise.
	(bit_cpu_AVX512VL): Likewise.
	(index_cpu_AVX512PF): Likewise.
	(index_cpu_AVX512ER): Likewise.
	(index_cpu_AVX512CD): Likewise.
	(index_cpu_AVX512BW): Likewise.
	(index_cpu_AVX512VL): Likewise.
	(reg_AVX512PF): Likewise.
	(reg_AVX512ER): Likewise.
	(reg_AVX512CD): Likewise.
	(reg_AVX512BW): Likewise.
	(reg_AVX512VL): Likewise.
---
 sysdeps/x86/cpu-features.c |  8 ++++++--
 sysdeps/x86/cpu-features.h | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index 33788ed..ae7f844 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -138,8 +138,6 @@ init_cpu_features (struct cpu_features *cpu_features)
 
 	    case 0x57:
 	      /* Knights Landing.  Enable Silvermont optimizations.  */
-	      cpu_features->feature[index_arch_Prefer_No_VZEROUPPER]
-		|= bit_arch_Prefer_No_VZEROUPPER;
 
 	    case 0x5c:
 	    case 0x5f:
@@ -225,6 +223,12 @@ init_cpu_features (struct cpu_features *cpu_features)
 	cpu_features->feature[index_arch_AVX_Fast_Unaligned_Load]
 	  |= bit_arch_AVX_Fast_Unaligned_Load;
 
+      /* Since AVX512ER is unique to Xeon Phi, set Prefer_No_VZEROUPPER
+         if AVX512ER is available.  */
+      if (CPU_FEATURES_CPU_P (cpu_features, AVX512ER))
+	cpu_features->feature[index_arch_Prefer_No_VZEROUPPER]
+	  |= bit_arch_Prefer_No_VZEROUPPER;
+
       /* To avoid SSE transition penalty, use _dl_runtime_resolve_slow.
          If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt.  */
       cpu_features->feature[index_arch_Use_dl_runtime_resolve_slow]
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 8ec1562..1583d65 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -63,6 +63,11 @@
 #define bit_cpu_AVX2		(1 << 5)
 #define bit_cpu_AVX512F		(1 << 16)
 #define bit_cpu_AVX512DQ	(1 << 17)
+#define bit_cpu_AVX512PF	(1 << 26)
+#define bit_cpu_AVX512ER	(1 << 27)
+#define bit_cpu_AVX512CD	(1 << 28)
+#define bit_cpu_AVX512BW	(1 << 30)
+#define bit_cpu_AVX512VL	(1u << 31)
 
 /* XCR0 Feature flags.  */
 #define bit_XMM_state		(1 << 1)
@@ -239,6 +244,11 @@ extern const struct cpu_features *__get_cpu_features (void)
 # define index_cpu_AVX2		COMMON_CPUID_INDEX_7
 # define index_cpu_AVX512F	COMMON_CPUID_INDEX_7
 # define index_cpu_AVX512DQ	COMMON_CPUID_INDEX_7
+# define index_cpu_AVX512PF	COMMON_CPUID_INDEX_7
+# define index_cpu_AVX512ER	COMMON_CPUID_INDEX_7
+# define index_cpu_AVX512CD	COMMON_CPUID_INDEX_7
+# define index_cpu_AVX512BW	COMMON_CPUID_INDEX_7
+# define index_cpu_AVX512VL	COMMON_CPUID_INDEX_7
 # define index_cpu_ERMS		COMMON_CPUID_INDEX_7
 # define index_cpu_RTM		COMMON_CPUID_INDEX_7
 # define index_cpu_FMA		COMMON_CPUID_INDEX_1
@@ -258,6 +268,11 @@ extern const struct cpu_features *__get_cpu_features (void)
 # define reg_AVX2		ebx
 # define reg_AVX512F		ebx
 # define reg_AVX512DQ		ebx
+# define reg_AVX512PF		ebx
+# define reg_AVX512ER		ebx
+# define reg_AVX512CD		ebx
+# define reg_AVX512BW		ebx
+# define reg_AVX512VL		ebx
 # define reg_ERMS		ebx
 # define reg_RTM		ebx
 # define reg_FMA		ecx
-- 
2.9.3