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tidy up 

llvm-svn: 122190
This commit is contained in:
Chris Lattner 2010-12-19 20:24:28 +00:00
parent c37bb023b1
commit b6252a376a
1 changed files with 17 additions and 18 deletions
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31
llvm/lib/Transforms/Scalar/GVN.cpp
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@ -1918,36 +1918,35 @@ bool GVN::processInstruction(Instruction *I,
// Allocations are always uniquely numbered, so we can save time and memory
// by fast failing them.
if (isa<AllocaInst>(I) || isa<TerminatorInst>(I)) {
if (isa<AllocaInst>(I) || isa<TerminatorInst>(I) || isa<PHINode>(I)) {
insert_table(Num, I);
return false;
}
if (isa<PHINode>(I)) {
insert_table(Num, I);
// If the number we were assigned was a brand new VN, then we don't
// need to do a lookup to see if the number already exists
// somewhere in the domtree: it can't!
} else if (Num == NextNum) {
if (Num == NextNum) {
insert_table(Num, I);
return false;
}
// Perform fast-path value-number based elimination of values inherited from
// dominators.
} else if (Value *repl = lookupNumber(I->getParent(), Num)) {
// Remove it!
VN.erase(I);
I->replaceAllUsesWith(repl);
if (MD && repl->getType()->isPointerTy())
MD->invalidateCachedPointerInfo(repl);
toErase.push_back(I);
return true;
} else {
Value *repl = lookupNumber(I->getParent(), Num);
if (repl == 0) {
// Failure, just remember this instance for future use.
insert_table(Num, I);
return false;
}
return false;
// Remove it!
VN.erase(I);
I->replaceAllUsesWith(repl);
if (MD && repl->getType()->isPointerTy())
MD->invalidateCachedPointerInfo(repl);
toErase.push_back(I);
return true;
}
/// runOnFunction - This is the main transformation entry point for a function.