diff options
| author | Bill Wendling <isanbard@gmail.com> | 2008-02-20 20:56:45 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2008-02-20 20:56:45 +0000 |
| commit | c927cc8731724a91733781c816b89d234c265d8c (patch) | |
| tree | 6e793a87115d920c1202765eebd5cb97a1ba1034 /lib/CodeGen/LiveVariables.cpp | |
| parent | e18bc08fbc674584fe3a3a0c6b866a5aea201a91 (diff) | |
Remove one of the fixmes that I put in there. From Evan:
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
Diffstat (limited to 'lib/CodeGen/LiveVariables.cpp')
| -rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index 809048e8ef..4b428d6f31 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -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) { |