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| author | Uros Bizjak <ubizjak@gmail.com> | 2018-10-14 22:23:54 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2018-11-05 10:42:32 +0100 |
| commit | 566b62a3676caed1f8c626e26066ff3ae3a38918 (patch) | |
| tree | a3fa577164533cb0fb2af5e3c1aaff9fa8f71a94 /arch/x86/include/asm/arch_hweight.h | |
| parent | Linux 4.20-rc1 (diff) | |
| download | linux-566b62a3676caed1f8c626e26066ff3ae3a38918.tar.xz linux-566b62a3676caed1f8c626e26066ff3ae3a38918.zip | |
x86: Use POPCNT mnemonics in arch_hweight.h
Recently, the minimum required version of binutils was changed to
2.20, which supports POPCNT instruction mnemonics.
Replace the byte-wise specification of POPCNT with those proper
mnemonics.
[ bp: massage commit message and remove line breaks. ]
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: Ingo Molnar <mingo@redhat.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20181014202354.21281-1-ubizjak@gmail.com
Diffstat (limited to 'arch/x86/include/asm/arch_hweight.h')
| -rw-r--r-- | arch/x86/include/asm/arch_hweight.h | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/x86/include/asm/arch_hweight.h b/arch/x86/include/asm/arch_hweight.h index 34a10b2d5b73..fc0693569f7a 100644 --- a/arch/x86/include/asm/arch_hweight.h +++ b/arch/x86/include/asm/arch_hweight.h @@ -5,15 +5,9 @@ #include <asm/cpufeatures.h> #ifdef CONFIG_64BIT -/* popcnt %edi, %eax */ -#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7" -/* popcnt %rdi, %rax */ -#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7" #define REG_IN "D" #define REG_OUT "a" #else -/* popcnt %eax, %eax */ -#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0" #define REG_IN "a" #define REG_OUT "a" #endif @@ -24,7 +18,7 @@ static __always_inline unsigned int __arch_hweight32(unsigned int w) { unsigned int res; - asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT) + asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT) : "="REG_OUT (res) : REG_IN (w)); @@ -52,7 +46,7 @@ static __always_inline unsigned long __arch_hweight64(__u64 w) { unsigned long res; - asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT) + asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT) : "="REG_OUT (res) : REG_IN (w)); |