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Fix a bug in calculating shufflevector indices when constructing vectors from other vectors.

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If I can find it again, I will check in a testcase.

llvm-svn: 85032
This commit is contained in:
Nate Begeman
2009-10-25 02:26:01 +00:00
parent 964020b8ba
commit b8326be4d9
1 changed files with 3 additions and 4 deletions
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7
clang/lib/CodeGen/CGExprScalar.cpp
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@@ -678,14 +678,13 @@ Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
// If the initializer is an ExtVecEltExpr (a swizzle), and the swizzle's
// input is the same width as the vector being constructed, generate an
// optimized shuffle of the swizzle input into the result.
unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
if (isa<ExtVectorElementExpr>(IE)) {
llvm::ShuffleVectorInst *SVI = cast<llvm::ShuffleVectorInst>(Init);
Value *SVOp = SVI->getOperand(0);
const llvm::VectorType *OpTy = cast<llvm::VectorType>(SVOp->getType());
if (OpTy->getNumElements() == ResElts) {
unsigned Offset = (CurIdx == 0) ? 0 : ResElts;
for (unsigned j = 0; j != CurIdx; ++j) {
// If the current vector initializer is a shuffle with undef, merge
// this shuffle directly into it.
@@ -717,13 +716,13 @@ Value *ScalarExprEmitter::VisitInitListExpr(InitListExpr *E) {
Args.push_back(llvm::UndefValue::get(I32Ty));
llvm::Constant *Mask = llvm::ConstantVector::get(&Args[0], ResElts);
Init = Builder.CreateShuffleVector(Init, llvm::UndefValue::get(VVT),
Mask, "vecext");
Mask, "vext");
Args.clear();
for (unsigned j = 0; j != CurIdx; ++j)
Args.push_back(llvm::ConstantInt::get(I32Ty, j));
for (unsigned j = 0; j != InitElts; ++j)
Args.push_back(llvm::ConstantInt::get(I32Ty, j+ResElts));
Args.push_back(llvm::ConstantInt::get(I32Ty, j+Offset));
for (unsigned j = CurIdx + InitElts; j != ResElts; ++j)
Args.push_back(llvm::UndefValue::get(I32Ty));
}