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authorDavid Daney <david.daney@cavium.com>2013-04-25 15:48:53 +0000
committerRalf Baechle <ralf@linux-mips.org>2013-04-26 17:18:24 +0200
commit3d39019a1655d195a60a86ebf38f9da30bd83d03 (patch)
tree3865e565fe49f2da4d9e690c8fdf63d7c04dbfa3
parente01961ceea5453ba93c386adf49fff6d1b811e74 (diff)
downloadvexpress-lsk-3d39019a1655d195a60a86ebf38f9da30bd83d03.tar.gz
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.h4
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index 0b1dbd22e6f..78d201fb6c8 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"