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Prefer r0 as TOS when performing virtual frame dup on ARM

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Review URL: http://codereview.chromium.org/1956004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4590 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
sgjesse@chromium.org 2010-05-05 09:11:21 +00:00
parent cbcec49cd7
commit f2751effa4
1 changed files with 6 additions and 2 deletions
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8
src/arm/virtual-frame-arm.cc
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@ -505,21 +505,25 @@ void VirtualFrame::Dup() {
break;
case R0_TOS:
__ mov(r1, r0);
// r0 and r1 contains the same value. Prefer a state with r0 holding TOS.
top_of_stack_state_ = R0_R1_TOS;
break;
case R1_TOS:
__ mov(r0, r1);
// r0 and r1 contains the same value. Prefer a state with r0 holding TOS.
top_of_stack_state_ = R0_R1_TOS;
break;
case R0_R1_TOS:
__ push(r1);
__ mov(r1, r0);
// No need to change state as r0 and r1 now contains the same value.
// r0 and r1 contains the same value. Prefer a state with r0 holding TOS.
top_of_stack_state_ = R0_R1_TOS;
break;
case R1_R0_TOS:
__ push(r0);
__ mov(r0, r1);
// No need to change state as r0 and r1 now contains the same value.
// r0 and r1 contains the same value. Prefer a state with r0 holding TOS.
top_of_stack_state_ = R0_R1_TOS;
break;
default:
UNREACHABLE();