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

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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
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2
lib/CodeGen/MachineInstr.cpp
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@ -39,6 +39,7 @@ void MachineInstr::addImplicitDefUseOperands() {
Op.IsKill = false;
Op.IsDead = false;
Op.contents.RegNo = *ImpDefs;
Op.auxInfo.subReg = 0;
Operands.push_back(Op);
}
if (TID->ImplicitUses)
@ -50,6 +51,7 @@ void MachineInstr::addImplicitDefUseOperands() {
Op.IsKill = false;
Op.IsDead = false;
Op.contents.RegNo = *ImpUses;
Op.auxInfo.subReg = 0;
Operands.push_back(Op);
}
}