diff options
| author | Jan Beulich <JBeulich@suse.com> | 2012-01-20 16:22:04 +0000 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-01-20 17:29:49 -0800 |
| commit | cb8095bba6d24118135a5683a956f4f4fb5f17bb (patch) | |
| tree | 25eff3732e8471e314591d0bc6ea41d96857c18b /arch/x86/lib/atomic64_386_32.S | |
| parent | 819165fb34b9777f852429f2c6d6f79fbb71b9eb (diff) | |
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>
Diffstat (limited to 'arch/x86/lib/atomic64_386_32.S')
| -rw-r--r-- | arch/x86/lib/atomic64_386_32.S | 6 |
1 files changed, 3 insertions, 3 deletions
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) |