6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-15 05:24:01 +00:00
Code Issues Projects Releases Wiki Activity

Clean up sub-register implementation by moving subReg information back to

Browse Source 
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
This commit is contained in:
Evan Cheng
2007-11-14 07:59:08 +00:00
parent f9572a4c2b
commit c498b0281f
9 changed files with 53 additions and 63 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -670,12 +670,8 @@ rewriteInstructionForSpills(const LiveInterval &li,
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 @@ rewriteInstructionForSpills(const LiveInterval &li,
// 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