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Fix CorrectExtraCFGEdges to allow for multiple LandingPad targets.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37394 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2007-06-02 00:08:15 +00:00
parent b468163869
commit 8e63bf375d
1 changed files with 6 additions and 9 deletions
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15
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
/// DestB, remove any other MBB successors from the CFG. DestA and DestB can
/// 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,
MachineBasicBlock *DestA,
MachineBasicBlock *DestB,
@ -700,25 +703,19 @@ static bool CorrectExtraCFGEdges(MachineBasicBlock &MBB,
}
MachineBasicBlock::succ_iterator SI = MBB.succ_begin();
bool foundPad = false;
MachineBasicBlock *OrigDestA = DestA, *OrigDestB = DestB;
while (SI != MBB.succ_end()) {
if (*SI == DestA && DestA == DestB) {
DestA = DestB = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI;
} else if (*SI == DestA) {
DestA = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI;
} else if (*SI == DestB) {
DestB = 0;
if ((*SI)->isLandingPad())
foundPad = true;
++SI;
} else if ((*SI)->isLandingPad() && !foundPad) {
foundPad = true;
} else if ((*SI)->isLandingPad() &&
*SI!=OrigDestA && *SI!=OrigDestB) {
++SI;
} else {
// Otherwise, this is a superfluous edge, remove it.