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MIPS: Use loop to initialize locals when optimizing for size.

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Port r17465 (9f3f3d1)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/59853002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17505 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
plind44@gmail.com 2013-11-05 17:52:47 +00:00
parent 9f80c8d72e
commit ebc5445912
1 changed files with 14 additions and 2 deletions
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14
src/mips/full-codegen-mips.cc
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@ -180,8 +180,20 @@ void FullCodeGenerator::Generate() {
ASSERT(!info->function()->is_generator() || locals_count == 0);
if (locals_count > 0) {
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
// Emit a loop to initialize stack cells for locals when optimizing for
// size. Otherwise, unroll the loop for maximum performance.
__ LoadRoot(t5, Heap::kUndefinedValueRootIndex);
if (FLAG_optimize_for_size && locals_count > 4) {
Label loop;
__ li(a2, Operand(locals_count));
__ bind(&loop);
__ Subu(a2, a2, 1);
__ push(t5);
__ Branch(&loop, gt, a2, Operand(zero_reg));
} else {
for (int i = 0; i < locals_count; i++) {
__ push(at);
__ push(t5);
}
}
}
}