Revision: 17505
Author: [email protected]
Date: Tue Nov 5 17:52:47 2013 UTC
Log: MIPS: Use loop to initialize locals when optimizing for size.
Port r17465 (9f3f3d1)
BUG=
[email protected]
Review URL: https://codereview.chromium.org/59853002
Patch from Balazs Kilvady <[email protected]>.
http://code.google.com/p/v8/source/detail?r=17505
Modified:
/branches/bleeding_edge/src/mips/full-codegen-mips.cc
=======================================
--- /branches/bleeding_edge/src/mips/full-codegen-mips.cc Tue Nov 5
09:54:59 2013 UTC
+++ /branches/bleeding_edge/src/mips/full-codegen-mips.cc Tue Nov 5
17:52:47 2013 UTC
@@ -180,8 +180,20 @@
ASSERT(!info->function()->is_generator() || locals_count == 0);
if (locals_count > 0) {
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
- for (int i = 0; i < locals_count; i++) {
- __ push(at);
+ // 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(t5);
+ }
}
}
}
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