From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Fri, 24 Jun 2022 16:42:12 +0000 (-0700)
Subject: x86: Align entry for memrchr to 64-bytes.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17d929ab2eea5fe34e8fc459f1baf28ae8a15ad5;p=thirdparty%2Fglibc.git

x86: Align entry for memrchr to 64-bytes.

The function was tuned around 64-byte entry alignment and performs
better for all sizes with it.

As well different code boths where explicitly written to touch the
minimum number of cache line i.e sizes <= 32 touch only the entry
cache line.

(cherry picked from commit 227afaa67213efcdce6a870ef5086200f1076438)
---

diff --git a/sysdeps/x86_64/multiarch/memrchr-avx2.S b/sysdeps/x86_64/multiarch/memrchr-avx2.S
index 5f8e0be18cf..edd8180ba1e 100644
--- a/sysdeps/x86_64/multiarch/memrchr-avx2.S
+++ b/sysdeps/x86_64/multiarch/memrchr-avx2.S
@@ -35,7 +35,7 @@
 # define VEC_SIZE			32
 # define PAGE_SIZE			4096
 	.section SECTION(.text), "ax", @progbits
-ENTRY(MEMRCHR)
+ENTRY_P2ALIGN(MEMRCHR, 6)
 # ifdef __ILP32__
 	/* Clear upper bits.  */
 	and	%RDX_LP, %RDX_LP