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Fix CorrectExtraCFGEdges to allow for multiple LandingPad targets. 

llvm-svn: 37394
This commit is contained in:
Dale Johannesen 2007-06-02 00:08:15 +00:00
parent 9746e3a22b
commit 6e7cdce773
1 changed files with 6 additions and 9 deletions
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15
llvm/lib/CodeGen/BranchFolding.cpp
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@ -675,6 +675,9 @@ bool BranchFolder::OptimizeBranches(MachineFunction &MF) {
/// CFG to be inserted. If we have proven that MBB can only branch to DestA and /// CFG to be inserted. If we have proven that MBB can only branch to DestA and
/// DestB, remove any other MBB successors from the CFG. DestA and DestB can /// DestB, remove any other MBB successors from the CFG. DestA and DestB can
/// be null. /// be null.
/// Besides DestA and DestB, retain other edges leading to LandingPads (currently
/// there can be only one; we don't check or require that here).
/// Note it is possible that DestA and/or DestB are LandingPads.
static bool CorrectExtraCFGEdges(MachineBasicBlock &MBB, static bool CorrectExtraCFGEdges(MachineBasicBlock &MBB,
MachineBasicBlock *DestA, MachineBasicBlock *DestA,
MachineBasicBlock *DestB, MachineBasicBlock *DestB,
@ -700,25 +703,19 @@ static bool CorrectExtraCFGEdges(MachineBasicBlock &MBB,
} }
MachineBasicBlock::succ_iterator SI = MBB.succ_begin(); MachineBasicBlock::succ_iterator SI = MBB.succ_begin();
bool foundPad = false; MachineBasicBlock *OrigDestA = DestA, *OrigDestB = DestB;
while (SI != MBB.succ_end()) { while (SI != MBB.succ_end()) {
if (*SI == DestA && DestA == DestB) { if (*SI == DestA && DestA == DestB) {
DestA = DestB = 0; DestA = DestB = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI; ++SI;
} else if (*SI == DestA) { } else if (*SI == DestA) {
DestA = 0; DestA = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI; ++SI;
} else if (*SI == DestB) { } else if (*SI == DestB) {
DestB = 0; DestB = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI; ++SI;
} else if ((*SI)->isLandingPad() && !foundPad) { } else if ((*SI)->isLandingPad() &&
foundPad = true; *SI!=OrigDestA && *SI!=OrigDestB) {
++SI; ++SI;
} else { } else {
// Otherwise, this is a superfluous edge, remove it. // Otherwise, this is a superfluous edge, remove it.