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Prefill allocated objects with one word fillers if we do not use allocation folding.

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BUG=
R=mstarzinger@chromium.org, titzer@chromium.org

Review URL: https://codereview.chromium.org/22903027

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16357 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
hpayer@chromium.org 2013-08-27 12:03:56 +00:00
parent 7fea193609
commit 9f8f0c6d45
1 changed files with 9 additions and 2 deletions
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11
src/hydrogen-instructions.h
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@ -5172,8 +5172,15 @@ class HAllocate V8_FINAL : public HTemplateInstruction<2> {
? ALLOCATE_IN_OLD_POINTER_SPACE : ALLOCATE_IN_OLD_DATA_SPACE)
: ALLOCATE_IN_NEW_SPACE;
if (instance_type == FIXED_DOUBLE_ARRAY_TYPE) {
flags_ = static_cast<HAllocate::Flags>(flags_ |
ALLOCATE_DOUBLE_ALIGNED);
flags_ = static_cast<HAllocate::Flags>(flags_ | ALLOCATE_DOUBLE_ALIGNED);
}
// We have to fill the allocated object with one word fillers if we do
// not use allocation folding since some allocations may depend on each
// other, i.e., have a pointer to each other. A GC in between these
// allocations may leave such objects behind in a not completely initialized
// state.
if (!FLAG_use_gvn || !FLAG_use_allocation_folding) {
flags_ = static_cast<HAllocate::Flags>(flags_ | PREFILL_WITH_FILLER);
}
}