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Bug 1174230 - Limit the complexity of regalloc bundles which can be merged together, r=sunfish.

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This commit is contained in:
Brian Hackett 2015-07-01 15:47:35 -07:00
parent daff2bcdc0
commit 563944c0c2
1 changed files with 8 additions and 0 deletions
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8
js/src/jit/BacktrackingAllocator.cpp
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@ -900,9 +900,17 @@ BacktrackingAllocator::tryMergeBundles(LiveBundle* bundle0, LiveBundle* bundle1)
}
}
// Limit the number of times we compare ranges if there are many ranges in
// one of the bundles, to avoid quadratic behavior.
static const size_t MAX_RANGES = 200;
// Make sure that ranges in the bundles do not overlap.
LiveRange::BundleLinkIterator iter0 = bundle0->rangesBegin(), iter1 = bundle1->rangesBegin();
size_t count = 0;
while (iter0 && iter1) {
if (++count >= MAX_RANGES)
return true;
LiveRange* range0 = LiveRange::get(*iter0);
LiveRange* range1 = LiveRange::get(*iter1);