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Change SplitBlock to increment a BasicBlock::iterator, not an Instruction*. Apparently they do different things :)

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This fixes a testcase that nate reduced from spass.

Also included are a couple minor code changes that don't affect the generated
code at all.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26235 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-16 19:36:22 +00:00
parent 77dea9b3c3
commit 10cd9bbde7
1 changed files with 27 additions and 23 deletions
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50
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -397,9 +397,10 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val,Loop *L){
/// the loop info is updated.
///
BasicBlock *LoopUnswitch::SplitBlock(BasicBlock *Old, Instruction *SplitPt) {
while (isa<PHINode>(SplitPt))
++SplitPt;
BasicBlock *New = Old->splitBasicBlock(SplitPt, Old->getName()+".split");
BasicBlock::iterator SplitIt = SplitPt;
while (isa<PHINode>(SplitIt))
++SplitIt;
BasicBlock *New = Old->splitBasicBlock(SplitIt, Old->getName()+".split");
// The new block lives in whichever loop the old one did.
if (Loop *L = LI->getLoopFor(Old))
@ -703,27 +704,30 @@ void LoopUnswitch::RewriteLoopBodyWithConditionConstant(Loop *L, Value *LIC,
// Haha, this loop could be unswitched. Get it? The unswitch pass could
// unswitch itself. Amazing.
for (unsigned i = 0, e = Users.size(); i != e; ++i)
if (Instruction *U = cast<Instruction>(Users[i]))
if (L->contains(U->getParent()))
if (IsEqual) {
U->replaceUsesOfWith(LIC, Val);
} else if (NotVal) {
U->replaceUsesOfWith(LIC, NotVal);
} else {
// If we know that LIC is not Val, use this info to simplify code.
if (SwitchInst *SI = dyn_cast<SwitchInst>(U)) {
for (unsigned i = 1, e = SI->getNumCases(); i != e; ++i) {
if (SI->getCaseValue(i) == Val) {
// Found a dead case value. Don't remove PHI nodes in the
// successor if they become single-entry, those PHI nodes may
// be in the Users list.
SI->getSuccessor(i)->removePredecessor(SI->getParent(), true);
SI->removeCase(i);
break;
}
if (Instruction *U = cast<Instruction>(Users[i])) {
if (!L->contains(U->getParent()))
continue;
if (IsEqual) {
U->replaceUsesOfWith(LIC, Val);
} else if (NotVal) {
U->replaceUsesOfWith(LIC, NotVal);
} else {
// If we know that LIC is not Val, use this info to simplify code.
if (SwitchInst *SI = dyn_cast<SwitchInst>(U)) {
for (unsigned i = 1, e = SI->getNumCases(); i != e; ++i) {
if (SI->getCaseValue(i) == Val) {
// Found a dead case value. Don't remove PHI nodes in the
// successor if they become single-entry, those PHI nodes may
// be in the Users list.
SI->getSuccessor(i)->removePredecessor(SI->getParent(), true);
SI->removeCase(i);
break;
}
}
// TODO: We could simplify stuff like X == C.
}
// TODO: We could simplify stuff like X == C.
}
}
}