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Commit fix for generating conditional branch pseudo instructions that

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avoids dereferencing the end() iterator when selecting the fallthrough
block.  This requires an ilist change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22212 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-06-15 18:22:43 +00:00
parent 0203a31808
commit 439009c81e
1 changed files with 8 additions and 3 deletions
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11
lib/Target/PowerPC/PPCISelPattern.cpp
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@ -1232,9 +1232,9 @@ void ISel::SelectBranchCC(SDOperand N)
Select(N.getOperand(0)); //chain
CCReg = SelectCC(N.getOperand(1), Opc, Inv, Idx);
// Iterate to the next basic block, unless we're already at the end of the
ilist<MachineBasicBlock>::iterator It = BB, E = BB->getParent()->end();
if (++It == E) It = BB;
// Iterate to the next basic block
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// If this is a two way branch, then grab the fallthrough basic block argument
// and build a PowerPC branch pseudo-op, suitable for long branch conversion
@ -1256,6 +1256,11 @@ void ISel::SelectBranchCC(SDOperand N)
}
}
} else {
// If the fallthrough path is off the end of the function, which would be
// undefined behavior, set it to be the same as the current block because
// we have nothing better to set it to, and leaving it alone will cause the
// PowerPC Branch Selection pass to crash.
if (It == BB->getParent()->end()) It = Dest;
BuildMI(BB, PPC::COND_BRANCH, 4).addReg(CCReg).addImm(Opc)
.addMBB(Dest).addMBB(It);
}