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Handle blocks with 2 unconditional branches in AnalyzeBranch.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37571 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2007-06-13 17:59:52 +00:00
parent ea632439d4
commit 13e8b51e3e
4 changed files with 40 additions and 0 deletions
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10
lib/Target/ARM/ARMInstrInfo.cpp
View File

@ -345,6 +345,16 @@ bool ARMInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
return false;
}
// If the block ends with two B's or tB's, handle it. The second one is not
// executed, so remove it.
if ((SecondLastOpc == ARM::B || SecondLastOpc==ARM::tB) &&
(LastOpc == ARM::B || LastOpc == ARM::tB)) {
TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
I = LastInst;
I->eraseFromParent();
return false;
}
// Otherwise, can't handle this.
return true;
}

10
lib/Target/Alpha/AlphaInstrInfo.cpp
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@ -200,6 +200,16 @@ bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TB
return false;
}
// If the block ends with two Alpha::BRs, handle it. The second one is not
// executed, so remove it.
if (SecondLastInst->getOpcode() == Alpha::BR &&
LastInst->getOpcode() == Alpha::BR) {
TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
I = LastInst;
I->eraseFromParent();
return false;
}
// Otherwise, can't handle this.
return true;
}

10
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -220,6 +220,16 @@ bool PPCInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
return false;
}
// If the block ends with two PPC:Bs, handle it. The second one is not
// executed, so remove it.
if (SecondLastInst->getOpcode() == PPC::B &&
LastInst->getOpcode() == PPC::B) {
TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
I = LastInst;
I->eraseFromParent();
return false;
}
// Otherwise, can't handle this.
return true;
}

10
lib/Target/X86/X86InstrInfo.cpp
View File

@ -427,6 +427,16 @@ bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
return false;
}
// If the block ends with two X86::JMPs, handle it. The second one is not
// executed, so remove it.
if (SecondLastInst->getOpcode() == X86::JMP &&
LastInst->getOpcode() == X86::JMP) {
TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
I = LastInst;
I->eraseFromParent();
return false;
}
// Otherwise, can't handle this.
return true;
}