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Bug 1413096 - Remove unnecessary call to ffs. r=njn

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Comparing ffs(x) == ffs(y), when x and y are guaranteed to be powers of
2 (or 0, or 1), is the same as x == y.

--HG--
extra : rebase_source : d6cc3399d85fa9fda2559435e99adbfb82ac8da0
This commit is contained in:
Mike Hommey 2017-10-30 17:57:55 +09:00
parent 3c71490814
commit 331ef2d1a6
1 changed files with 2 additions and 2 deletions
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4
memory/build/mozjemalloc.cpp
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@ -3680,8 +3680,8 @@ arena_ralloc(void* aPtr, size_t aSize, size_t aOldSize, arena_t* aArena)
// Try to avoid moving the allocation.
if (aSize < small_min) {
if (aOldSize < small_min &&
ffs((int)(RoundUpPow2(aSize) >> (TINY_MIN_2POW + 1))) ==
ffs((int)(RoundUpPow2(aOldSize) >> (TINY_MIN_2POW + 1)))) {
(RoundUpPow2(aSize) >> (TINY_MIN_2POW + 1) ==
RoundUpPow2(aOldSize) >> (TINY_MIN_2POW + 1))) {
goto IN_PLACE; // Same size class.
}
} else if (aSize <= small_max) {