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Message-ID: <174293932910.14745.11013941982683227927.tip-bot2@tip-bot2>
Date: Tue, 25 Mar 2025 21:48:49 -0000
From: "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>, Ingo Molnar <mingo@...nel.org>,
Andy Lutomirski <luto@...nel.org>, Brian Gerst <brgerst@...il.com>,
Juergen Gross <jgross@...e.com>, "H. Peter Anvin" <hpa@...or.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/asm] x86/bitops: Use TZCNT mnemonic in <asm/bitops.h>
The following commit has been merged into the x86/asm branch of tip:
Commit-ID: 0717b1392dc7e3f350e5a5d25ea794aa92210684
Gitweb: https://git.kernel.org/tip/0717b1392dc7e3f350e5a5d25ea794aa92210684
Author: Uros Bizjak <ubizjak@...il.com>
AuthorDate: Tue, 25 Mar 2025 18:52:01 +01:00
Committer: Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 25 Mar 2025 22:38:29 +01:00
x86/bitops: Use TZCNT mnemonic in <asm/bitops.h>
Current minimum required version of binutils is 2.25,
which supports TZCNT instruction mnemonic.
Replace "REP; BSF" in variable__{ffs,ffz}() function
with this proper mnemonic.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20250325175215.330659-1-ubizjak@gmail.com
---
arch/x86/include/asm/bitops.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
index 100413a..bbaf75e 100644
--- a/arch/x86/include/asm/bitops.h
+++ b/arch/x86/include/asm/bitops.h
@@ -248,7 +248,7 @@ arch_test_bit_acquire(unsigned long nr, const volatile unsigned long *addr)
static __always_inline unsigned long variable__ffs(unsigned long word)
{
- asm("rep; bsf %1,%0"
+ asm("tzcnt %1,%0"
: "=r" (word)
: ASM_INPUT_RM (word));
return word;
@@ -267,7 +267,7 @@ static __always_inline unsigned long variable__ffs(unsigned long word)
static __always_inline unsigned long variable_ffz(unsigned long word)
{
- asm("rep; bsf %1,%0"
+ asm("tzcnt %1,%0"
: "=r" (word)
: "r" (~word));
return word;
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