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From: Noah Goldstein <nwg@sourceware.org>
To: glibc-cvs@sourceware.org
Subject: [glibc] x86: Use `testb` for case-locale check in str{n}casecmp-avx2
Date: Thu, 20 Oct 2022 19:04:05 +0000 (GMT)	[thread overview]
Message-ID: <20221020190405.688A1384D171@sourceware.org> (raw)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6d02d64570e83bedfdb946cb1bdf0c9fd6d3eb0

commit b6d02d64570e83bedfdb946cb1bdf0c9fd6d3eb0
Author: Noah Goldstein <goldstein.w.n@gmail.com>
Date:   Wed Oct 19 19:13:35 2022 -0700

    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:
---
 sysdeps/x86_64/multiarch/strcmp-avx2.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S
index 4c01d664e8..a24f886a27 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

                 reply	other threads:[~2022-10-20 19:04 UTC|newest]

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