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authorJan Beulich <JBeulich@suse.com>2012-01-20 16:22:04 +0000
committerH. Peter Anvin <hpa@linux.intel.com>2012-01-20 17:29:49 -0800
commitcb8095bba6d24118135a5683a956f4f4fb5f17bb (patch)
tree25eff3732e8471e314591d0bc6ea41d96857c18b
parent819165fb34b9777f852429f2c6d6f79fbb71b9eb (diff)
downloadlinux-cb8095bba6d24118135a5683a956f4f4fb5f17bb.tar.bz2
x86: atomic64 assembly improvements
In the "xchg" implementation, %ebx and %ecx don't need to be copied into %eax and %edx respectively (this is only necessary when desiring to only read the stored value). In the "add_unless" implementation, swapping the use of %ecx and %esi for passing arguments allows %esi to become an input only (i.e. permitting the register to be re-used to address the same object without reload). In "{add,sub}_return", doing the initial read64 through the passed in %ecx decreases a register dependency. In "inc_not_zero", a branch can be eliminated by or-ing together the two halves of the current (64-bit) value, and code size can be further reduced by adjusting the arithmetic slightly. v2: Undo the folding of "xchg" and "set". Signed-off-by: Jan Beulich <jbeulich@suse.com> Link: http://lkml.kernel.org/r/4F19A2BC020000780006E0DC@nat28.tlf.novell.com Cc: Luca Barbieri <luca@luca-barbieri.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
-rw-r--r--arch/x86/include/asm/atomic64_32.h5
-rw-r--r--arch/x86/lib/atomic64_386_32.S6
-rw-r--r--arch/x86/lib/atomic64_cx8_32.S29
3 files changed, 16 insertions, 24 deletions
diff --git a/arch/x86/include/asm/atomic64_32.h b/arch/x86/include/asm/atomic64_32.h
index 908303f68bba..198119910da5 100644
--- a/arch/x86/include/asm/atomic64_32.h
+++ b/arch/x86/include/asm/atomic64_32.h
@@ -288,9 +288,8 @@ static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
unsigned low = (unsigned)u;
unsigned high = (unsigned)(u >> 32);
alternative_atomic64(add_unless,
- ASM_OUTPUT2("+A" (a), "+c" (v),
- "+S" (low), "+D" (high)),
- ASM_NO_INPUT_CLOBBER("memory"));
+ ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
+ "S" (v) : "memory");
return (int)a;
}
diff --git a/arch/x86/lib/atomic64_386_32.S b/arch/x86/lib/atomic64_386_32.S
index e8e7e0d06f42..00933d5e992f 100644
--- a/arch/x86/lib/atomic64_386_32.S
+++ b/arch/x86/lib/atomic64_386_32.S
@@ -137,13 +137,13 @@ BEGIN(dec_return)
RET_ENDP
#undef v
-#define v %ecx
+#define v %esi
BEGIN(add_unless)
- addl %eax, %esi
+ addl %eax, %ecx
adcl %edx, %edi
addl (v), %eax
adcl 4(v), %edx
- cmpl %eax, %esi
+ cmpl %eax, %ecx
je 3f
1:
movl %eax, (v)
diff --git a/arch/x86/lib/atomic64_cx8_32.S b/arch/x86/lib/atomic64_cx8_32.S
index 391a083674b4..f5cc9eb1d51b 100644
--- a/arch/x86/lib/atomic64_cx8_32.S
+++ b/arch/x86/lib/atomic64_cx8_32.S
@@ -55,8 +55,6 @@ ENDPROC(atomic64_set_cx8)
ENTRY(atomic64_xchg_cx8)
CFI_STARTPROC
- movl %ebx, %eax
- movl %ecx, %edx
1:
LOCK_PREFIX
cmpxchg8b (%esi)
@@ -78,7 +76,7 @@ ENTRY(atomic64_\func\()_return_cx8)
movl %edx, %edi
movl %ecx, %ebp
- read64 %ebp
+ read64 %ecx
1:
movl %eax, %ebx
movl %edx, %ecx
@@ -159,23 +157,22 @@ ENTRY(atomic64_add_unless_cx8)
SAVE ebx
/* these just push these two parameters on the stack */
SAVE edi
- SAVE esi
+ SAVE ecx
- movl %ecx, %ebp
- movl %eax, %esi
+ movl %eax, %ebp
movl %edx, %edi
- read64 %ebp
+ read64 %esi
1:
cmpl %eax, 0(%esp)
je 4f
2:
movl %eax, %ebx
movl %edx, %ecx
- addl %esi, %ebx
+ addl %ebp, %ebx
adcl %edi, %ecx
LOCK_PREFIX
- cmpxchg8b (%ebp)
+ cmpxchg8b (%esi)
jne 1b
movl $1, %eax
@@ -199,13 +196,13 @@ ENTRY(atomic64_inc_not_zero_cx8)
read64 %esi
1:
- testl %eax, %eax
- je 4f
-2:
+ movl %eax, %ecx
+ orl %edx, %ecx
+ jz 3f
movl %eax, %ebx
- movl %edx, %ecx
+ xorl %ecx, %ecx
addl $1, %ebx
- adcl $0, %ecx
+ adcl %edx, %ecx
LOCK_PREFIX
cmpxchg8b (%esi)
jne 1b
@@ -214,9 +211,5 @@ ENTRY(atomic64_inc_not_zero_cx8)
3:
RESTORE ebx
ret
-4:
- testl %edx, %edx
- jne 2b
- jmp 3b
CFI_ENDPROC
ENDPROC(atomic64_inc_not_zero_cx8)