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BBVectorize: Only some insert element operand pairs are free.

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This fixes another infinite recursion case when using target costs.
We can only replace insert element input chains that are pure (end
with inserting into an undef).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167784 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2012-11-12 23:55:36 +00:00
parent 5090b2d377
commit b2b2469a91
2 changed files with 102 additions and 13 deletions
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lib/Transforms/Vectorize/BBVectorize.cpp
+17 -13
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@@ -677,6 +677,19 @@ assert(n < 10 && "hrmm, really?");
return false;
}
bool isPureIEChain(InsertElementInst *IE) {
InsertElementInst *IENext = IE;
do {
if (!isa<UndefValue>(IENext->getOperand(0)) &&
!isa<InsertElementInst>(IENext->getOperand(0))) {
return false;
}
} while ((IENext =
dyn_cast<InsertElementInst>(IENext->getOperand(0))));
return true;
}
};
// This function implements one vectorization iteration on the provided
@@ -1854,7 +1867,9 @@ assert(n < 10 && "hrmm, really?");
// folded with other operations.
if (Ty1 == Ty2) {
// If both are insert elements, then both can be widened.
if (isa<InsertElementInst>(O1) && isa<InsertElementInst>(O2))
InsertElementInst *IEO1 = dyn_cast<InsertElementInst>(O1),
*IEO2 = dyn_cast<InsertElementInst>(O2);
if (IEO1 && IEO2 && isPureIEChain(IEO1) && isPureIEChain(IEO2))
continue;
// If both are extract elements, and both have the same input
// type, then they can be replaced with a shuffle
@@ -2126,18 +2141,7 @@ assert(n < 10 && "hrmm, really?");
if (InsertElementInst *LIE = dyn_cast<InsertElementInst>(LOp)) {
// If we have a pure insertelement chain, then this can be rewritten
// into a chain that directly builds the larger type.
bool PureChain = true;
InsertElementInst *LIENext = LIE;
do {
if (!isa<UndefValue>(LIENext->getOperand(0)) &&
!isa<InsertElementInst>(LIENext->getOperand(0))) {
PureChain = false;
break;
}
} while ((LIENext =
dyn_cast<InsertElementInst>(LIENext->getOperand(0))));
if (PureChain) {
if (isPureIEChain(LIE)) {
SmallVector<Value *, 8> VectElemts(numElemL,
UndefValue::get(ArgTypeL->getScalarType()));
InsertElementInst *LIENext = LIE;