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x86: Set Prefer_No_VZEROUPPER if AVX512ER is available

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AVX512ER won't be implemented in any Xeon processors and will be in
all Xeon Phi processors.  Don't check CPU model number when setting
Prefer_No_VZEROUPPER for Xeon Phi.  Instead, set Prefer_No_VZEROUPPER
if AVX512ER is available.  It works with current and future Xeon Phi
and non-Xeon Phi processors.

	* 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.
This commit is contained in:
H.J. Lu 2017-04-18 08:27:22 -07:00
parent cef9b65376
commit 1c53cb49de
3 changed files with 42 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
ChangeLog
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@ -1,3 +1,24 @@
2017-04-18 H.J. Lu <hongjiu.lu@intel.com>
* 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.
2017-04-18 Florian Weimer <fweimer@redhat.com>
* elf/dl-misc.c (_dl_sysdep_read_whole_file): Assume that

8
sysdeps/x86/cpu-features.c
View File

@ -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]

15
sysdeps/x86/cpu-features.h
View File

@ -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