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authorStefan Liebler <stli@linux.ibm.com>2019-03-22 11:14:08 +0100
committerStefan Liebler <stli@linux.ibm.com>2019-03-22 11:14:08 +0100
commit6f47401bd5fc71209219779a0426170a9a7395b0 (patch)
tree2051a4e99c19afffe4e58521aca5bded7c913a73 /sysdeps/s390/multiarch
parent96fbb9a328232e42814334d6e29a9a9c7995c01d (diff)
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S390: Add arch13 strstr ifunc variant.
This patch introduces the new arch13 ifunc variant for strstr.
For needles longer than 9 charachters it is relying on the common-code
implementation.  For shorter needles it is using the new vstrs instruction
which is able to search a substring within a vector register.

ChangeLog:

	* sysdeps/s390/Makefile (sysdep_routines): Add strstr-arch13.
	* sysdeps/s390/ifunc-strstr.h (HAVE_STRSTR_ARCH13, STRSTR_ARCH13,
	STRSTR_Z13_ONLY_USED_AS_FALLBACK, HAVE_STRSTR_IFUNC_AND_ARCH13_SUPPORT):
	New defines.
	* sysdeps/s390/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add ifunc variant for arch13 strstr.
	* sysdeps/s390/strstr-arch13.S: New file.
	* sysdeps/s390/strstr-vx.c: Omit GI symbol for z13 strstr ifunc variant
	if it is only used as fallback.
	* sysdeps/s390/strstr.c (strstr): Add arch13 variant in ifunc selector.
Diffstat (limited to 'sysdeps/s390/multiarch')
-rw-r--r--sysdeps/s390/multiarch/ifunc-impl-list.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
index d742d66a6a..75289b582b 100644
--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
@@ -186,6 +186,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
 
 #if HAVE_STRSTR_IFUNC
     IFUNC_IMPL (i, name, strstr,
+# if HAVE_STRSTR_ARCH13
+		IFUNC_IMPL_ADD (array, i, strstr,
+				dl_hwcap & HWCAP_S390_VXRS_EXT2, STRSTR_ARCH13)
+# endif
 # if HAVE_STRSTR_Z13
 		IFUNC_IMPL_ADD (array, i, strstr,
 				dl_hwcap & HWCAP_S390_VX, STRSTR_Z13)