From: Noah Goldstein <goldstein.w.n@gmail.com>
To: libc-alpha@sourceware.org
Cc: goldstein.w.n@gmail.com, hjl.tools@gmail.com, carlos@systemhalted.org
Subject: [PATCH v1 1/4] x86: Use `testb` for case-locale check in str{n}casecmp-avx2
Date: Wed, 19 Oct 2022 19:13:35 -0700 [thread overview]
Message-ID: <20221020021338.3394281-1-goldstein.w.n@gmail.com> (raw)
`testb` saves a bit of code size is the imm-operand can be encoded
1-bytes.
Tested on x86-64.
---
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
--
2.34.1
next reply other threads:[~2022-10-20 2:14 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 2:13 Noah Goldstein [this message]
2022-10-20 2:13 ` [PATCH v1 2/4] x86: Use `testb` for case-locale check in str{n}casecmp-sse2 Noah Goldstein
2022-10-20 17:03 ` H.J. Lu
2022-10-20 2:13 ` [PATCH v1 3/4] x86: Use `testb` for case-locale check in str{n}casecmp-sse42 Noah Goldstein
2022-10-20 17:03 ` H.J. Lu
2022-10-20 2:13 ` [PATCH v1 4/4] x86: Use `testb` for FSRM check in memmove-vec-unaligned-erms Noah Goldstein
2022-10-20 17:03 ` H.J. Lu
2022-10-20 17:02 ` [PATCH v1 1/4] x86: Use `testb` for case-locale check in str{n}casecmp-avx2 H.J. Lu
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