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Simplify the logic of getting hold of a PHI predecessor block.

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There is now a direct way from value-use-iterator to incoming block in PHINode's API.
This way we avoid the iterator->index->iterator trip, and especially the costly
getOperandNo() invocation. Additionally there is now an assertion that the iterator
really refers to one of the PHI's Uses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62869 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif
2009-01-23 19:40:15 +00:00
parent 60789e419e
commit a36791da41
6 changed files with 14 additions and 12 deletions
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6
lib/Transforms/Utils/LCSSA.cpp
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@@ -175,8 +175,7 @@ void LCSSA::ProcessInstruction(Instruction *Instr,
UI != E;) {
BasicBlock *UserBB = cast<Instruction>(*UI)->getParent();
if (PHINode *P = dyn_cast<PHINode>(*UI)) {
unsigned OperandNo = UI.getOperandNo();
UserBB = P->getIncomingBlock(OperandNo/2);
UserBB = P->getIncomingBlock(UI);
}
// If the user is in the loop, don't rewrite it!
@@ -212,8 +211,7 @@ void LCSSA::getLoopValuesUsedOutsideLoop(Loop *L,
++UI) {
BasicBlock *UserBB = cast<Instruction>(*UI)->getParent();
if (PHINode* p = dyn_cast<PHINode>(*UI)) {
unsigned OperandNo = UI.getOperandNo();
UserBB = p->getIncomingBlock(OperandNo/2);
UserBB = p->getIncomingBlock(UI);
}
if (*BB != UserBB && !inLoop(UserBB)) {