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llvm::SplitEdge should refuse to split an edge from an indirectbr.

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Fix CodeGenPrepare to not try to split edges from indirectbr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85690 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-10-31 22:04:43 +00:00
parent 07d236ba88
commit a4b04210d4
2 changed files with 4 additions and 1 deletions
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3
lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@ -318,6 +318,7 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum,
if (Invoke->getSuccessor(1) == Dest)
return;
}
// As a hack, never split backedges of loops. Even though the copy for any
// PHIs inserted on the backedge would be dead for exits from the loop, we
@ -852,7 +853,7 @@ bool CodeGenPrepare::OptimizeBlock(BasicBlock &BB) {
// Split all critical edges where the dest block has a PHI.
TerminatorInst *BBTI = BB.getTerminator();
if (BBTI->getNumSuccessors() > 1) {
if (BBTI->getNumSuccessors() > 1 && !isa<IndirectBrInst>(BBTI)) {
for (unsigned i = 0, e = BBTI->getNumSuccessors(); i != e; ++i) {
BasicBlock *SuccBB = BBTI->getSuccessor(i);
if (isa<PHINode>(SuccBB->begin()) && isCriticalEdge(BBTI, i, true))

2
lib/Transforms/Utils/BasicBlockUtils.cpp
View File

@ -271,6 +271,8 @@ void llvm::RemoveSuccessor(TerminatorInst *TI, unsigned SuccNum) {
/// SplitEdge - Split the edge connecting specified block. Pass P must
/// not be NULL.
BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
assert(!isa<IndirectBrInst>(BB->getTerminator()) &&
"Cannot split an edge from an IndirectBrInst");
TerminatorInst *LatchTerm = BB->getTerminator();
unsigned SuccNum = 0;
#ifndef NDEBUG