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From: Alexey Dobriyan <adobriyan@gmail.com>
To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] x86: drop REG_OUT macro from hweight functions
Date: Sun, 28 Jul 2019 14:51:40 +0300	[thread overview]
Message-ID: <20190728115140.GA32463@avx2> (raw)

Output register is always RAX/EAX.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---

 arch/x86/include/asm/arch_hweight.h |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/arch/x86/include/asm/arch_hweight.h
+++ b/arch/x86/include/asm/arch_hweight.h
@@ -6,10 +6,8 @@
 
 #ifdef CONFIG_64BIT
 #define REG_IN "D"
-#define REG_OUT "a"
 #else
 #define REG_IN "a"
-#define REG_OUT "a"
 #endif
 
 static __always_inline unsigned int __arch_hweight32(unsigned int w)
@@ -17,7 +15,7 @@ static __always_inline unsigned int __arch_hweight32(unsigned int w)
 	unsigned int res;
 
 	asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
-			 : "="REG_OUT (res)
+			 : "=a" (res)
 			 : REG_IN (w));
 
 	return res;
@@ -45,7 +43,7 @@ static __always_inline unsigned long __arch_hweight64(__u64 w)
 	unsigned long res;
 
 	asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
-			 : "="REG_OUT (res)
+			 : "=a" (res)
 			 : REG_IN (w));
 
 	return res;

             reply	other threads:[~2019-07-28 11:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-28 11:51 Alexey Dobriyan [this message]
2019-07-29  9:43 ` Peter Zijlstra
2019-07-29 10:04   ` Peter Zijlstra
2019-07-29 20:44     ` Alexey Dobriyan
2019-07-30  8:08       ` Peter Zijlstra
2019-07-30 13:42         ` hpa

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