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BBVectorize: Check the input types of shuffles for legality

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This fixes a bug where shuffles were being fused such that the
resulting input types were not legal on the target. This would
occur only when both inputs and dependencies were also foldable
operations (such as other shuffles) and there were other connected
pairs in the same block.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167731 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2012-11-12 14:50:59 +00:00
parent dece7039dd
commit 8b9796f4f8
2 changed files with 31 additions and 3 deletions
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lib/Transforms/Vectorize/BBVectorize.cpp
+6 -3
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@@ -483,6 +483,8 @@ namespace {
if (SelectInst *SI = dyn_cast<SelectInst>(I)) {
T2 = SI->getCondition()->getType();
} else if (ShuffleVectorInst *SI = dyn_cast<ShuffleVectorInst>(I)) {
T2 = SI->getOperand(0)->getType();
}
}
@@ -987,10 +989,11 @@ namespace {
// 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.
unsigned VParts = VTTI->getNumberOfParts(VT1);
if (VParts > 1)
unsigned VParts1 = VTTI->getNumberOfParts(VT1),
VParts2 = VTTI->getNumberOfParts(VT2);
if (VParts1 > 1 || VParts2 > 1)
return false;
else if (!VParts && VCost == ICost + JCost)
else if ((!VParts1 || !VParts2) && VCost == ICost + JCost)
return false;
CostSavings = ICost + JCost - VCost;