x86-64: Add ifunc-avx2.h functions with 256-bit EVEX

Update ifunc-avx2.h, strchr.c, strcmp.c, strncmp.c and wcsnlen.c to
select the function optimized with 256-bit EVEX instructions using
YMM16-YMM31 registers to avoid RTM abort with usable AVX512VL, AVX512BW
and BMI2 since VZEROUPPER isn't needed at function exit.

For strcmp/strncmp, prefer AVX2 strcmp/strncmp if Prefer_AVX2_STRCMP
is set.

1 files changed, 81 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
index 1be5dd0323..3bf10d3714 100644
--- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c
@@ -43,6 +43,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __memchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, memchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __memchr_evex)
 	      IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/memcmp.c.  */
@@ -121,6 +126,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, memrchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __memrchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, memrchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)),
+			      __memrchr_evex)
+
 	      IFUNC_IMPL_ADD (array, i, memrchr, 1, __memrchr_sse2))
 
 #ifdef SHARED
@@ -179,6 +189,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, rawmemchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __rawmemchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, rawmemchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __rawmemchr_evex)
 	      IFUNC_IMPL_ADD (array, i, rawmemchr, 1, __rawmemchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/strlen.c.  */
@@ -186,6 +201,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strlen,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strlen_avx2)
+	      IFUNC_IMPL_ADD (array, i, strlen,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)),
+			      __strlen_evex)
 	      IFUNC_IMPL_ADD (array, i, strlen, 1, __strlen_sse2))
 
   /* Support sysdeps/x86_64/multiarch/strnlen.c.  */
@@ -193,6 +212,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strnlen,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strnlen_avx2)
+	      IFUNC_IMPL_ADD (array, i, strnlen,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)),
+			      __strnlen_evex)
 	      IFUNC_IMPL_ADD (array, i, strnlen, 1, __strnlen_sse2))
 
   /* Support sysdeps/x86_64/multiarch/stpncpy.c.  */
@@ -255,6 +278,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, strchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __strchr_evex)
 	      IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2_no_bsf)
 	      IFUNC_IMPL_ADD (array, i, strchr, 1, __strchr_sse2))
 
@@ -263,6 +291,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strchrnul,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strchrnul_avx2)
+	      IFUNC_IMPL_ADD (array, i, strchrnul,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __strchrnul_evex)
 	      IFUNC_IMPL_ADD (array, i, strchrnul, 1, __strchrnul_sse2))
 
   /* Support sysdeps/x86_64/multiarch/strrchr.c.  */
@@ -270,6 +303,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strrchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strrchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, strrchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)),
+			      __strrchr_evex)
 	      IFUNC_IMPL_ADD (array, i, strrchr, 1, __strrchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/strcmp.c.  */
@@ -277,6 +314,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strcmp,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strcmp_avx2)
+	      IFUNC_IMPL_ADD (array, i, strcmp,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __strcmp_evex)
 	      IFUNC_IMPL_ADD (array, i, strcmp, CPU_FEATURE_USABLE (SSE4_2),
 			      __strcmp_sse42)
 	      IFUNC_IMPL_ADD (array, i, strcmp, CPU_FEATURE_USABLE (SSSE3),
@@ -370,6 +412,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wcschr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcschr_avx2)
+	      IFUNC_IMPL_ADD (array, i, wcschr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcschr_evex)
 	      IFUNC_IMPL_ADD (array, i, wcschr, 1, __wcschr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wcsrchr.c.  */
@@ -377,6 +424,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wcsrchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcsrchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, wcsrchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcsrchr_evex)
 	      IFUNC_IMPL_ADD (array, i, wcsrchr, 1, __wcsrchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wcscmp.c.  */
@@ -384,6 +436,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wcscmp,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcscmp_avx2)
+	      IFUNC_IMPL_ADD (array, i, wcscmp,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcscmp_evex)
 	      IFUNC_IMPL_ADD (array, i, wcscmp, 1, __wcscmp_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wcsncmp.c.  */
@@ -391,6 +448,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wcsncmp,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcsncmp_avx2)
+	      IFUNC_IMPL_ADD (array, i, wcsncmp,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcsncmp_evex)
 	      IFUNC_IMPL_ADD (array, i, wcsncmp, 1, __wcsncmp_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wcscpy.c.  */
@@ -404,6 +466,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wcslen,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcslen_avx2)
+	      IFUNC_IMPL_ADD (array, i, wcslen,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcslen_evex)
 	      IFUNC_IMPL_ADD (array, i, wcslen, 1, __wcslen_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wcsnlen.c.  */
@@ -412,6 +479,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wcsnlen_avx2)
 	      IFUNC_IMPL_ADD (array, i, wcsnlen,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wcsnlen_evex)
+	      IFUNC_IMPL_ADD (array, i, wcsnlen,
 			      CPU_FEATURE_USABLE (SSE4_1),
 			      __wcsnlen_sse4_1)
 	      IFUNC_IMPL_ADD (array, i, wcsnlen, 1, __wcsnlen_sse2))
@@ -421,6 +493,11 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, wmemchr,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __wmemchr_avx2)
+	      IFUNC_IMPL_ADD (array, i, wmemchr,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)
+			       && CPU_FEATURE_USABLE (BMI2)),
+			      __wmemchr_evex)
 	      IFUNC_IMPL_ADD (array, i, wmemchr, 1, __wmemchr_sse2))
 
   /* Support sysdeps/x86_64/multiarch/wmemcmp.c.  */
@@ -568,6 +645,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 	      IFUNC_IMPL_ADD (array, i, strncmp,
 			      CPU_FEATURE_USABLE (AVX2),
 			      __strncmp_avx2)
+	      IFUNC_IMPL_ADD (array, i, strncmp,
+			      (CPU_FEATURE_USABLE (AVX512VL)
+			       && CPU_FEATURE_USABLE (AVX512BW)),
+			      __strncmp_evex)
 	      IFUNC_IMPL_ADD (array, i, strncmp, CPU_FEATURE_USABLE (SSE4_2),
 			      __strncmp_sse42)
 	      IFUNC_IMPL_ADD (array, i, strncmp, CPU_FEATURE_USABLE (SSSE3),