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Implement support for branch reversal, fix a bug in branch analysis.

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This provides stuff like:

        cmpw cr0, r15, r29
        mr r14, r15
-       bge cr0, LBB3_111       ;bb656
-       b LBB3_90       ;bb501
+       blt cr0, LBB3_90        ;bb501
 LBB3_111:      ;bb656
        lwz r18, 68(r1)

which is particularly good for dispatch group formation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31101 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-10-21 06:03:11 +00:00
parent a2d799531a
commit 7c4fe259f8
1 changed files with 5 additions and 2 deletions
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7
lib/Target/PowerPC/PPCInstrInfo.cpp
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@ -186,7 +186,7 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
TBB = LastInst->getOperand(2).getMachineBasicBlock();
Cond.push_back(LastInst->getOperand(0));
Cond.push_back(LastInst->getOperand(1));
return true;
return false;
}
// Otherwise, don't know what this is.
return true;
@ -261,5 +261,8 @@ void PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
bool PPCInstrInfo::
ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
return true;
assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
// Leave the CR# the same, but invert the condition.
Cond[1].setImm(invertPPCBranchOpcode(Cond[1].getImm()));
return false;
}