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Implement support for branch condition reversal. 

llvm-svn: 31099
This commit is contained in:
Chris Lattner 2006-10-21 05:52:40 +00:00
parent 3ca52185af
commit 3a897f31fa
2 changed files with 33 additions and 2 deletions
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30
llvm/lib/Target/X86/X86InstrInfo.cpp
View File

@ -290,6 +290,31 @@ unsigned X86::GetCondBranchFromCond(X86::CondCode CC) {
}
}
/// GetOppositeBranchCondition - Return the inverse of the specified condition,
/// e.g. turning COND_E to COND_NE.
X86::CondCode X86::GetOppositeBranchCondition(X86::CondCode CC) {
switch (CC) {
default: assert(0 && "Illegal condition code!");
case X86::COND_E: return X86::COND_NE;
case X86::COND_NE: return X86::COND_E;
case X86::COND_L: return X86::COND_GE;
case X86::COND_LE: return X86::COND_G;
case X86::COND_G: return X86::COND_LE;
case X86::COND_GE: return X86::COND_L;
case X86::COND_B: return X86::COND_AE;
case X86::COND_BE: return X86::COND_A;
case X86::COND_A: return X86::COND_BE;
case X86::COND_AE: return X86::COND_B;
case X86::COND_S: return X86::COND_NS;
case X86::COND_NS: return X86::COND_S;
case X86::COND_P: return X86::COND_NP;
case X86::COND_NP: return X86::COND_P;
case X86::COND_O: return X86::COND_NO;
case X86::COND_NO: return X86::COND_O;
}
}
bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
@ -397,8 +422,9 @@ void X86InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
bool X86InstrInfo::
ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
// TODO: IMPLEMENT.
return true;
assert(Cond.size() == 1 && "Invalid X86 branch condition!");
Cond[0].setImm(GetOppositeBranchCondition((X86::CondCode)Cond[0].getImm()));
return false;
}
const TargetRegisterClass *X86InstrInfo::getPointerRegClass() const {

5
llvm/lib/Target/X86/X86InstrInfo.h
View File

@ -46,6 +46,11 @@ namespace X86 {
// Turn condition code into conditional branch opcode.
unsigned GetCondBranchFromCond(CondCode CC);
/// GetOppositeBranchCondition - Return the inverse of the specified cond,
/// e.g. turning COND_E to COND_NE.
CondCode GetOppositeBranchCondition(X86::CondCode CC);
}
/// X86II - This namespace holds all of the target specific flags that