maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Clarify a comment. 

llvm-svn: 52212
This commit is contained in:
Matthijs Kooijman 2008-06-11 09:00:12 +00:00
parent 9f25c1d219
commit 3453c7bcb5
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -10613,7 +10613,6 @@ static Value *FindScalarElement(Value *V, unsigned EltNo) {
}
Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
// If vector val is undef, replace extract with scalar undef.
if (isa<UndefValue>(EI.getOperand(0)))
return ReplaceInstUsesWith(EI, UndefValue::get(EI.getType()));
@ -10623,8 +10622,9 @@ Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
return ReplaceInstUsesWith(EI, Constant::getNullValue(EI.getType()));
if (ConstantVector *C = dyn_cast<ConstantVector>(EI.getOperand(0))) {
// If vector val is constant with uniform operands, replace EI
// with that operand
// If vector val is constant with all elements the same, replace EI with
// that element. When the elements are not identical, we cannot replace yet
// (we do that below, but only when the index is constant).
Constant *op0 = C->getOperand(0);
for (unsigned i = 1; i < C->getNumOperands(); ++i)
if (C->getOperand(i) != op0) {