From 499487742ec4299852f7ae8962acebf7bc2a22a4 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 9 Feb 2004 01:43:23 +0000 Subject: [PATCH] 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 --- lib/CodeGen/LiveVariables.cpp | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index eafbb1c18a3..a8627396ccc 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; } }