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| author | David Daney <david.daney@cavium.com> | 2013-04-25 19:48:53 +0400 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-04-26 19:18:24 +0400 |
| commit | 3d39019a1655d195a60a86ebf38f9da30bd83d03 (patch) | |
| tree | 3865e565fe49f2da4d9e690c8fdf63d7c04dbfa3 | |
| parent | e01961ceea5453ba93c386adf49fff6d1b811e74 (diff) | |
| download | linux-3d39019a1655d195a60a86ebf38f9da30bd83d03.tar.xz | |
MIPS: Remove redundant instructions from arch_spin_{,try}lock.
We were doing:
SRL $r,$?,16
ANDI $r,$r,0xffff
The logical right shift by 16 leaves the upper 16 bits clear, so the
subsequent masking out of those bits is redundant, and can safely be
removed.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/include/asm/spinlock.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h index 0b1dbd22e6f8..78d201fb6c87 100644 --- a/arch/mips/include/asm/spinlock.h +++ b/arch/mips/include/asm/spinlock.h @@ -71,7 +71,6 @@ static inline void arch_spin_lock(arch_spinlock_t *lock) " nop \n" " srl %[my_ticket], %[ticket], 16 \n" " andi %[ticket], %[ticket], 0xffff \n" - " andi %[my_ticket], %[my_ticket], 0xffff \n" " bne %[ticket], %[my_ticket], 4f \n" " subu %[ticket], %[my_ticket], %[ticket] \n" "2: \n" @@ -105,7 +104,6 @@ static inline void arch_spin_lock(arch_spinlock_t *lock) " beqz %[my_ticket], 1b \n" " srl %[my_ticket], %[ticket], 16 \n" " andi %[ticket], %[ticket], 0xffff \n" - " andi %[my_ticket], %[my_ticket], 0xffff \n" " bne %[ticket], %[my_ticket], 4f \n" " subu %[ticket], %[my_ticket], %[ticket] \n" "2: \n" @@ -153,7 +151,6 @@ static inline unsigned int arch_spin_trylock(arch_spinlock_t *lock) " \n" "1: ll %[ticket], %[ticket_ptr] \n" " srl %[my_ticket], %[ticket], 16 \n" - " andi %[my_ticket], %[my_ticket], 0xffff \n" " andi %[now_serving], %[ticket], 0xffff \n" " bne %[my_ticket], %[now_serving], 3f \n" " addu %[ticket], %[ticket], %[inc] \n" @@ -178,7 +175,6 @@ static inline unsigned int arch_spin_trylock(arch_spinlock_t *lock) " \n" "1: ll %[ticket], %[ticket_ptr] \n" " srl %[my_ticket], %[ticket], 16 \n" - " andi %[my_ticket], %[my_ticket], 0xffff \n" " andi %[now_serving], %[ticket], 0xffff \n" " bne %[my_ticket], %[now_serving], 3f \n" " addu %[ticket], %[ticket], %[inc] \n" |