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Use findCommutedOpIndices to find the operands to commute.

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llvm-svn: 75312
This commit is contained in:
Evan Cheng 2009-07-10 23:26:12 +00:00
parent 88593195a0
commit 84a8e5aadc
1 changed files with 13 additions and 3 deletions
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16
lib/CodeGen/TargetInstrInfoImpl.cpp
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@ -18,16 +18,26 @@
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
// commuteInstruction - The default implementation of this method just exchanges
// operand 1 and 2.
// the two operands returned by findCommutedOpIndices.
MachineInstr *TargetInstrInfoImpl::commuteInstruction(MachineInstr *MI,
bool NewMI) const {
const TargetInstrDesc &TID = MI->getDesc();
bool HasDef = TID.getNumDefs();
unsigned Idx1 = HasDef ? 1 : 0;
unsigned Idx2 = HasDef ? 2 : 1;
if (HasDef && !MI->getOperand(0).isReg())
// No idea how to commute this instruction. Target should implement its own.
return 0;
unsigned Idx1, Idx2;
if (!findCommutedOpIndices(MI, Idx1, Idx2)) {
std::string msg;
raw_string_ostream Msg(msg);
Msg << "Don't know how to commute: " << *MI;
llvm_report_error(Msg.str());
}
assert(MI->getOperand(Idx1).isReg() && MI->getOperand(Idx2).isReg() &&
"This only knows how to commute register operands so far");