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[NFC][PowerPC] code refactor: split IsReassociable to fma and add.

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Reviewed By: jsji

Differential Revision: https://reviews.llvm.org/D92070
This commit is contained in:
Chen Zheng 2020-11-24 21:50:39 -05:00
parent 7a3eb287f6
commit c19797f647
1 changed files with 27 additions and 15 deletions
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42
lib/Target/PowerPC/PPCInstrInfo.cpp
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@ -339,16 +339,9 @@ bool PPCInstrInfo::getFMAPatterns(
return true;
};
auto IsReassociable = [&](const MachineInstr &Instr, int16_t &AddOpIdx,
bool IsLeaf, bool IsAdd) {
int16_t Idx = -1;
if (!IsAdd) {
Idx = getFMAOpIdxInfo(Instr.getOpcode());
if (Idx < 0)
return false;
} else if (Instr.getOpcode() !=
FMAOpIdxInfo[getFMAOpIdxInfo(Root.getOpcode())]
[InfoArrayIdxFAddInst])
auto IsReassociableAdd = [&](const MachineInstr &Instr) {
if (Instr.getOpcode() !=
FMAOpIdxInfo[getFMAOpIdxInfo(Root.getOpcode())][InfoArrayIdxFAddInst])
return false;
// Instruction can be reassociated.
@ -361,7 +354,26 @@ bool PPCInstrInfo::getFMAPatterns(
if (!IsAllOpsVirtualReg(Instr))
return false;
if (IsAdd && IsLeaf)
return true;
};
auto IsReassociableFMA = [&](const MachineInstr &Instr, int16_t &AddOpIdx,
bool IsLeaf) {
int16_t Idx = getFMAOpIdxInfo(Instr.getOpcode());
if (Idx < 0)
return false;
// Instruction can be reassociated.
// fast math flags may prohibit reassociation.
if (!(Instr.getFlag(MachineInstr::MIFlag::FmReassoc) &&
Instr.getFlag(MachineInstr::MIFlag::FmNsz)))
return false;
// Instruction operands are virtual registers for reassociation.
if (!IsAllOpsVirtualReg(Instr))
return false;
if (IsLeaf)
return true;
AddOpIdx = FMAOpIdxInfo[Idx][InfoArrayIdxAddOpIdx];
@ -379,7 +391,7 @@ bool PPCInstrInfo::getFMAPatterns(
int16_t AddOpIdx = -1;
// Root must be a valid FMA like instruction.
if (!IsReassociable(Root, AddOpIdx, false, false))
if (!IsReassociableFMA(Root, AddOpIdx, false))
return false;
assert((AddOpIdx >= 0) && "add operand index not right!");
@ -389,7 +401,7 @@ bool PPCInstrInfo::getFMAPatterns(
// Prev must be a valid FMA like instruction.
AddOpIdx = -1;
if (!IsReassociable(*Prev, AddOpIdx, false, false))
if (!IsReassociableFMA(*Prev, AddOpIdx, false))
return false;
assert((AddOpIdx >= 0) && "add operand index not right!");
@ -397,11 +409,11 @@ bool PPCInstrInfo::getFMAPatterns(
Register RegA = Prev->getOperand(AddOpIdx).getReg();
MachineInstr *Leaf = MRI.getUniqueVRegDef(RegA);
AddOpIdx = -1;
if (IsReassociable(*Leaf, AddOpIdx, true, false)) {
if (IsReassociableFMA(*Leaf, AddOpIdx, true)) {
Patterns.push_back(MachineCombinerPattern::REASSOC_XMM_AMM_BMM);
return true;
}
if (IsReassociable(*Leaf, AddOpIdx, true, true)) {
if (IsReassociableAdd(*Leaf)) {
Patterns.push_back(MachineCombinerPattern::REASSOC_XY_AMM_BMM);
return true;
}