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Move PPC getSwappedPredicate for reuse

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The getSwappedPredicate function can be used in other places (such as in
improvements to the PPCCTRLoops pass). Instead of trapping it as a static
function in PPCInstrInfo, move it into PPCPredicates with other
predicate-related things.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2013-04-20 05:16:26 +00:00
parent 456ca048af
commit abe64dc6f7
3 changed files with 20 additions and 17 deletions
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15
lib/Target/PowerPC/MCTargetDesc/PPCPredicates.cpp
View File

@ -29,3 +29,18 @@ PPC::Predicate PPC::InvertPredicate(PPC::Predicate Opcode) {
}
llvm_unreachable("Unknown PPC branch opcode!");
}
PPC::Predicate PPC::getSwappedPredicate(PPC::Predicate Opcode) {
switch (Opcode) {
case PPC::PRED_EQ: return PPC::PRED_EQ;
case PPC::PRED_NE: return PPC::PRED_NE;
case PPC::PRED_LT: return PPC::PRED_GT;
case PPC::PRED_GE: return PPC::PRED_LE;
case PPC::PRED_GT: return PPC::PRED_LT;
case PPC::PRED_LE: return PPC::PRED_GE;
case PPC::PRED_NU: return PPC::PRED_NU;
case PPC::PRED_UN: return PPC::PRED_UN;
}
llvm_unreachable("Unknown PPC branch opcode!");
}

4
lib/Target/PowerPC/MCTargetDesc/PPCPredicates.h
View File

@ -37,6 +37,10 @@ namespace PPC {
/// Invert the specified predicate. != -> ==, < -> >=.
Predicate InvertPredicate(Predicate Opcode);
/// Assume the condition register is set by MI(a,b), return the predicate if
/// we modify the instructions such that condition register is set by MI(b,a).
Predicate getSwappedPredicate(Predicate Opcode);
}
}

18
lib/Target/PowerPC/PPCInstrInfo.cpp
View File

@ -1087,22 +1087,6 @@ bool PPCInstrInfo::analyzeCompare(const MachineInstr *MI,
}
}
/// Assume the flags are set by MI(a,b), return the condition code if we modify
/// the instructions such that flags are set by MI(b,a).
PPC::Predicate static getSwappedPredicate(PPC::Predicate Opcode) {
switch (Opcode) {
case PPC::PRED_EQ: return PPC::PRED_EQ;
case PPC::PRED_NE: return PPC::PRED_NE;
case PPC::PRED_LT: return PPC::PRED_GT;
case PPC::PRED_GE: return PPC::PRED_LE;
case PPC::PRED_GT: return PPC::PRED_LT;
case PPC::PRED_LE: return PPC::PRED_GE;
case PPC::PRED_NU: return PPC::PRED_NU;
case PPC::PRED_UN: return PPC::PRED_UN;
}
llvm_unreachable("Unknown PPC branch opcode!");
}
bool PPCInstrInfo::optimizeCompareInstr(MachineInstr *CmpInstr,
unsigned SrcReg, unsigned SrcReg2,
int Mask, int Value,
@ -1320,7 +1304,7 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr *CmpInstr,
Pred == PPC::PRED_EQ || Pred == PPC::PRED_NE) &&
"Invalid predicate for equality-only optimization");
PredsToUpdate.push_back(std::make_pair(&((*I).getOperand(0)),
getSwappedPredicate(Pred)));
PPC::getSwappedPredicate(Pred)));
} else if (UseMI->getOpcode() == PPC::ISEL ||
UseMI->getOpcode() == PPC::ISEL8) {
unsigned NewSubReg = UseMI->getOperand(3).getSubReg();