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BBVectorize, when using VTTI, should not form types that will be split.

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This is needed so that perl's SHA can be compiled (otherwise
BBVectorize takes far too long to find its fixed point).

I'll try to come up with a reduced test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-10-25 23:47:16 +00:00
parent 12413ae7cb
commit 82149a9106
1 changed files with 19 additions and 0 deletions
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19
lib/Transforms/Vectorize/BBVectorize.cpp
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@ -817,6 +817,15 @@ namespace {
IAddressSpace);
if (VCost > ICost + JCost)
return false;
// FIXME: We don't want to fuse to a type that will be split, even
// if the two input types will also be split and there is no other
// associated cost. This check depends on the fact
// that the current implementation of getMemoryOpCost returns only
// the type-splitting cost.
if (VCost > 1)
return false;
CostSavings = ICost + JCost - VCost;
}
} else {
@ -831,6 +840,16 @@ namespace {
if (VCost > ICost + JCost)
return false;
// FIXME: We don't want to fuse to a type that will be split, even
// if the two input types will also be split and there is no other
// associated cost. This check depends on the fact
// that the current implementation of getMemoryOpCost returns only
// the type-splitting cost (and does nothing else).
unsigned VTypeCost = VTTI->getMemoryOpCost(I->getOpcode(), VT1, 0, 0);
if (VTypeCost > 1)
return false;
CostSavings = ICost + JCost - VCost;
}