Add a TargetRegisterInfo::composeSubRegIndices hook with a default
implementation that is correct for most targets. Tablegen will override where
needed.
Add MachineOperand::subst{Virt,Phys}Reg methods that correctly handle existing
subreg indices when sustituting registers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104985 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp
index e54cd5c..ce0c5e6 100644
--- a/lib/CodeGen/MachineInstr.cpp
+++ b/lib/CodeGen/MachineInstr.cpp
@@ -111,6 +111,25 @@
Contents.Reg.RegNo = Reg;
}
+void MachineOperand::substVirtReg(unsigned Reg, unsigned SubIdx,
+ const TargetRegisterInfo &TRI) {
+ assert(TargetRegisterInfo::isVirtualRegister(Reg));
+ if (SubIdx && getSubReg())
+ SubIdx = TRI.composeSubRegIndices(SubIdx, getSubReg());
+ setReg(Reg);
+ setSubReg(SubIdx);
+}
+
+void MachineOperand::substPhysReg(unsigned Reg, const TargetRegisterInfo &TRI) {
+ assert(TargetRegisterInfo::isPhysicalRegister(Reg));
+ if (getSubReg()) {
+ Reg = TRI.getSubReg(Reg, getSubReg());
+ assert(Reg && "Invalid SubReg for physical register");
+ setSubReg(0);
+ }
+ setReg(Reg);
+}
+
/// ChangeToImmediate - Replace this operand with a new immediate operand of
/// the specified value. If an operand is known to be an immediate already,
/// the setImm method should be used.