Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.471 -> 1.472
---
Log message:
Add support for inserting undef into a vector. This implements
Transforms/InstCombine/vec_insert_to_shuffle.ll
---
Diffs of the changes: (+14 -3)
InstructionCombining.cpp | 17 ++++++++++++++---
1 files changed, 14 insertions(+), 3 deletions(-)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.471
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.472
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.471 Thu Apr 20
10:41:37 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Thu Apr 27 16:14:21 2006
@@ -6959,12 +6959,23 @@
Value *ScalarOp = IEI->getOperand(1);
Value *IdxOp = IEI->getOperand(2);
- if (ExtractElementInst *EI = dyn_cast<ExtractElementInst>(ScalarOp)) {
- if (isa<ConstantInt>(EI->getOperand(1)) && isa<ConstantInt>(IdxOp) &&
+ if (!isa<ConstantInt>(IdxOp))
+ return false;
+ unsigned InsertedIdx = cast<ConstantInt>(IdxOp)->getRawValue();
+
+ if (isa<UndefValue>(ScalarOp)) { // inserting undef into vector.
+ // Okay, we can handle this if the vector we are insertinting into is
+ // transitively ok.
+ if (CollectSingleShuffleElements(VecOp, LHS, RHS, Mask)) {
+ // If so, update the mask to reflect the inserted undef.
+ Mask[InsertedIdx] = UndefValue::get(Type::UIntTy);
+ return true;
+ }
+ } else if (ExtractElementInst *EI =
dyn_cast<ExtractElementInst>(ScalarOp)){
+ if (isa<ConstantInt>(EI->getOperand(1)) &&
EI->getOperand(0)->getType() == V->getType()) {
unsigned ExtractedIdx =
cast<ConstantInt>(EI->getOperand(1))->getRawValue();
- unsigned InsertedIdx = cast<ConstantInt>(IdxOp)->getRawValue();
// This must be extracting from either LHS or RHS.
if (EI->getOperand(0) == LHS || EI->getOperand(0) == RHS) {
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