From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Thu, 20 Oct 2022 02:13:37 +0000 (-0700)
Subject: x86: Use `testb` for case-locale check in str{n}casecmp-sse42
X-Git-Tag: glibc-2.37~233
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f04f8373ddd71794050b904174fb06967be6393f;p=thirdparty%2Fglibc.git

x86: Use `testb` for case-locale check in str{n}casecmp-sse42

`testb` saves a bit of code size is the imm-operand can be encoded
1-bytes.

Tested on x86-64.
---

diff --git a/sysdeps/x86_64/multiarch/strcmp-sse4_2.S b/sysdeps/x86_64/multiarch/strcmp-sse4_2.S
index dc6fc90e14a..6b540ff894b 100644
--- a/sysdeps/x86_64/multiarch/strcmp-sse4_2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-sse4_2.S
@@ -119,7 +119,7 @@ STRCMP:
 #  else
 	mov	(%rdx), %RAX_LP
 #  endif
-	testl	$1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	testb	$1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
 	jne	__strcasecmp_l_nonascii
 # endif
 # ifdef USE_AS_STRNCASECMP_L
@@ -130,7 +130,7 @@ STRCMP:
 #  else
 	mov	(%rcx), %RAX_LP
 #  endif
-	testl	$1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
+	testb	$1, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES(%rax)
 	jne	__strncasecmp_l_nonascii
 # endif