From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Thu, 20 Oct 2022 02:13:35 +0000 (-0700)
Subject: x86: Use `testb` for case-locale check in str{n}casecmp-avx2
X-Git-Tag: glibc-2.37~235
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b6d02d64570e83bedfdb946cb1bdf0c9fd6d3eb0;p=thirdparty%2Fglibc.git

x86: Use `testb` for case-locale check in str{n}casecmp-avx2

`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-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index 4c01d664e87..a24f886a278 100644
--- a/sysdeps/x86_64/multiarch/strcmp-avx2.S
+++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S
@@ -214,7 +214,7 @@ STRCMP:
 #  else
 	mov	(%LOCALE_REG), %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
 	leaq	_nl_C_LC_CTYPE_tolower + 128 * 4(%rip), TOLOWER_BASE
 # endif