diff options
| author | Chris Lattner <sabre@nondot.org> | 2004-02-09 01:43:23 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-02-09 01:43:23 +0000 |
| commit | 499487742ec4299852f7ae8962acebf7bc2a22a4 (patch) | |
| tree | f6522c90f2b24350b57be26b3e599dc731acff51 /lib/CodeGen/LiveVariables.cpp | |
| parent | 96aef893383a6ffcc6d6955c5d969f0fd57831c2 (diff) | |
Ugh, perform an optimization that GCC should be able to do itself. This
speeds up livevar from .48/.32s -> .45/.31s in LLC on perlbmk
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11217 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/LiveVariables.cpp')
| -rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index eafbb1c18a..a8627396cc 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -146,14 +146,15 @@ void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) { for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg); *AliasSet; ++AliasSet) { - if (MachineInstr *LastUse = PhysRegInfo[*AliasSet]) { - if (PhysRegUsed[*AliasSet]) - RegistersKilled.insert(std::make_pair(LastUse, *AliasSet)); + unsigned Alias = *AliasSet; + if (MachineInstr *LastUse = PhysRegInfo[Alias]) { + if (PhysRegUsed[Alias]) + RegistersKilled.insert(std::make_pair(LastUse, Alias)); else - RegistersDead.insert(std::make_pair(LastUse, *AliasSet)); + RegistersDead.insert(std::make_pair(LastUse, Alias)); } - PhysRegInfo[*AliasSet] = MI; - PhysRegUsed[*AliasSet] = false; + PhysRegInfo[Alias] = MI; + PhysRegUsed[Alias] = false; } } |