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[PowerPC] Correct commutable indices for VSX FMA instructions

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Although the first two operands are the ones that can be swapped, the tied
input operand is listed before them, so we need to adjust for that.

I have a test case for this, but it goes along with an upcoming commit (so it
will come soon).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204748 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2014-03-25 19:26:43 +00:00
parent fba0a057a2
commit 7e77dabbd0
2 changed files with 18 additions and 0 deletions
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15
lib/Target/PowerPC/PPCInstrInfo.cpp
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@ -282,6 +282,21 @@ PPCInstrInfo::commuteInstruction(MachineInstr *MI, bool NewMI) const {
return MI;
}
bool PPCInstrInfo::findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
unsigned &SrcOpIdx2) const {
// For VSX A-Type FMA instructions, it is the first two operands that can be
// commuted, however, because the non-encoded tied input operand is listed
// first, the operands to swap are actually the second and third.
int AltOpc = PPC::getAltVSXFMAOpcode(MI->getOpcode());
if (AltOpc == -1)
return TargetInstrInfo::findCommutedOpIndices(MI, SrcOpIdx1, SrcOpIdx2);
SrcOpIdx1 = 2;
SrcOpIdx2 = 3;
return true;
}
void PPCInstrInfo::insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const {
// This function is used for scheduling, and the nop wanted here is the type

3
lib/Target/PowerPC/PPCInstrInfo.h
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@ -119,6 +119,9 @@ public:
// rotate amt is zero. We also have to munge the immediates a bit.
virtual MachineInstr *commuteInstruction(MachineInstr *MI, bool NewMI) const;
virtual bool findCommutedOpIndices(MachineInstr *MI, unsigned &SrcOpIdx1,
unsigned &SrcOpIdx2) const;
virtual void insertNoop(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const;