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Remove one of the fixmes that I put in there. From Evan:

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No need to go up more levels. A def of a register also sets its sub-registers
(so if PhysRegInfo[SuperReg] is NULL, it means SuperReg's super registers are
not previously defined).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47399 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-02-20 20:56:45 +00:00
parent e18bc08fbc
commit c927cc8731
1 changed files with 3 additions and 2 deletions
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5
lib/CodeGen/LiveVariables.cpp
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@ -258,8 +258,9 @@ void LiveVariables::HandlePhysRegUse(unsigned Reg, MachineInstr *MI) {
bool HasPrevDef = PhysRegInfo[SuperReg] != NULL;
if (!HasPrevDef)
// FIXME: This only goes back one level of super-registers. It might miss
// some.
// No need to go up more levels. A def of a register also sets its sub-
// registers. So if PhysRegInfo[SuperReg] is NULL, it means SuperReg's
// super-registers are not previously defined.
for (const unsigned *SSRegs = RegInfo->getSuperRegisters(SuperReg);
unsigned SSReg = *SSRegs; ++SSRegs)
if (PhysRegInfo[SSReg] != NULL) {