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GlobalISel: Directly expose getDefSrcRegIgnoringCopies utility 

It's useful to get both the instruction and register at the same time.
This commit is contained in:
Matt Arsenault 2020-11-11 10:24:23 -05:00
parent 8741a76f5d
commit c67e1a985f
2 changed files with 14 additions and 9 deletions
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12
llvm/include/llvm/CodeGen/GlobalISel/Utils.h
View File

@ -151,6 +151,18 @@ const ConstantFP* getConstantFPVRegVal(Register VReg,
MachineInstr *getOpcodeDef(unsigned Opcode, Register Reg,
const MachineRegisterInfo &MRI);
/// Simple struct used to hold a Register value and the instruction which
/// defines it.
struct DefinitionAndSourceRegister {
MachineInstr *MI;
Register Reg;
};
/// Find the def instruction for \p Reg, and underlying value Register folding
/// away any copies.
Optional<DefinitionAndSourceRegister>
getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI);
/// Find the def instruction for \p Reg, folding away any trivial copies. May
/// return nullptr if \p Reg is not a generic virtual register.
MachineInstr *getDefIgnoringCopies(Register Reg,

11
llvm/lib/CodeGen/GlobalISel/Utils.cpp
View File

@ -351,15 +351,8 @@ llvm::getConstantFPVRegVal(Register VReg, const MachineRegisterInfo &MRI) {
return MI->getOperand(1).getFPImm();
}
namespace {
struct DefinitionAndSourceRegister {
MachineInstr *MI;
Register Reg;
};
} // namespace
static Optional<DefinitionAndSourceRegister>
getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI) {
Optional<DefinitionAndSourceRegister>
llvm::getDefSrcRegIgnoringCopies(Register Reg, const MachineRegisterInfo &MRI) {
Register DefSrcReg = Reg;
auto *DefMI = MRI.getVRegDef(Reg);
auto DstTy = MRI.getType(DefMI->getOperand(0).getReg());