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authorH.J. Lu <hjl.tools@gmail.com>2017-06-09 05:45:43 -0700
committerH.J. Lu <hjl.tools@gmail.com>2017-06-09 05:45:52 -0700
commitd2538b91568af2a63c9d8649ce11756d4dfbdac3 (patch)
tree22cc8602e6ab159f296651224be8a6c3460f2581 /ChangeLog
parent5ac7aa1d7cce8580f8225c33c819991abca102b9 (diff)
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x86-64: Optimize strrchr/wcsrchr with AVX2
Optimize strrchr/wcsrchr with AVX2 to check 32 bytes with vector
instructions.  It is as fast as SSE2 version for small data sizes
and up to 1X faster for large data sizes on Haswell.  Select AVX2
version on AVX2 machines where vzeroupper is preferred and AVX
unaligned load is fast.

	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	strrchr-sse2, strrchr-avx2, wcsrchr-sse2 and wcsrchr-avx2.
	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
	(__libc_ifunc_impl_list): Add tests for __strrchr_avx2,
	__strrchr_sse2, __wcsrchr_avx2 and __wcsrchr_sse2.
	* sysdeps/x86_64/multiarch/strrchr-avx2.S: New file.
	* sysdeps/x86_64/multiarch/strrchr-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strrchr.c: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr-avx2.S: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/wcsrchr.c: Likewise.
Diffstat (limited to 'ChangeLog')
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diff --git a/ChangeLog b/ChangeLog
index 8fea821f91..d45f71d5f8 100644
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+++ b/ChangeLog
@@ -1,6 +1,20 @@
 2017-06-09  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
+	strrchr-sse2, strrchr-avx2, wcsrchr-sse2 and wcsrchr-avx2.
+	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
+	(__libc_ifunc_impl_list): Add tests for __strrchr_avx2,
+	__strrchr_sse2, __wcsrchr_avx2 and __wcsrchr_sse2.
+	* sysdeps/x86_64/multiarch/strrchr-avx2.S: New file.
+	* sysdeps/x86_64/multiarch/strrchr-sse2.S: Likewise.
+	* sysdeps/x86_64/multiarch/strrchr.c: Likewise.
+	* sysdeps/x86_64/multiarch/wcsrchr-avx2.S: Likewise.
+	* sysdeps/x86_64/multiarch/wcsrchr-sse2.S: Likewise.
+	* sysdeps/x86_64/multiarch/wcsrchr.c: Likewise.
+
+2017-06-09  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
 	memrchr-sse2 and memrchr-avx2.
 	* sysdeps/x86_64/multiarch/ifunc-impl-list.c
 	(__libc_ifunc_impl_list): Add tests for __memrchr_avx2 and