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Don't pollute the meaning of isUnpredicatedTerminator.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-07-26 17:32:14 +00:00
parent 77baf8e80e
commit 85dce6cf78
1 changed files with 12 additions and 7 deletions
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19
lib/Target/X86/X86InstrInfo.cpp
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@ -402,11 +402,7 @@ X86::CondCode X86::GetOppositeBranchCondition(X86::CondCode CC) {
}
}
// For purposes of branch analysis do not count FP_REG_KILL as a terminator.
bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
if (MI->getOpcode() == X86::FP_REG_KILL)
return false;
const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
if (TID->Flags & M_TERMINATOR_FLAG) {
// Conditional branch is a special case.
@ -419,20 +415,28 @@ bool X86InstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
return false;
}
// For purposes of branch analysis do not count FP_REG_KILL as a terminator.
static bool isBrAnalysisUnpredicatedTerminator(const MachineInstr *MI,
const X86InstrInfo &TII) {
if (MI->getOpcode() == X86::FP_REG_KILL)
return false;
return TII.isUnpredicatedTerminator(MI);
}
bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
std::vector<MachineOperand> &Cond) const {
// If the block has no terminators, it just falls into the block after it.
MachineBasicBlock::iterator I = MBB.end();
if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
if (I == MBB.begin() || !isBrAnalysisUnpredicatedTerminator(--I, *this))
return false;
// Get the last instruction in the block.
MachineInstr *LastInst = I;
// If there is only one terminator instruction, process it.
if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
if (I == MBB.begin() || !isBrAnalysisUnpredicatedTerminator(--I, *this)) {
if (!isBranch(LastInst->getOpcode()))
return true;
@ -457,7 +461,8 @@ bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
MachineInstr *SecondLastInst = I;
// If there are three terminators, we don't know what sort of block this is.
if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(--I))
if (SecondLastInst && I != MBB.begin() &&
isBrAnalysisUnpredicatedTerminator(--I, *this))
return true;
// If the block ends with X86::JMP and a conditional branch, handle it.