Clean up sub-register implementation by moving subReg information back to
MachineOperand auxInfo. Previous clunky implementation uses an external map
to track sub-register uses. That works because register allocator uses
a new virtual register for each spilled use. With interval splitting (coming
soon), we may have multiple uses of the same register some of which are
of using different sub-registers from others. It's too fragile to constantly
update the information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44104 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index ac5fc8c..833868a 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -670,12 +670,8 @@
unsigned RegI = Reg;
if (Reg == 0 || MRegisterInfo::isPhysicalRegister(Reg))
continue;
- bool isSubReg = RegMap->isSubRegister(Reg);
- unsigned SubIdx = 0;
- if (isSubReg) {
- SubIdx = RegMap->getSubRegisterIndex(Reg);
- Reg = RegMap->getSuperRegister(Reg);
- }
+ unsigned SubIdx = mop.getSubReg();
+ bool isSubReg = SubIdx != 0;
if (Reg != li.reg)
continue;
@@ -710,8 +706,6 @@
// Create a new virtual register for the spill interval.
unsigned NewVReg = RegMap->createVirtualRegister(rc);
vrm.grow();
- if (isSubReg)
- RegMap->setIsSubRegister(NewVReg, NewVReg, SubIdx);
// Scan all of the operands of this instruction rewriting operands
// to use NewVReg instead of li.reg as appropriate. We do this for