From a618e13c8390040521e3bd55cfd072d3afd3f7d0 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Mon, 19 Jul 2004 05:55:50 +0000 Subject: Two changes, both very significant: * vreg <-> vreg joining now works, enable it unconditionally when joining is enabled (which is the default). * Fix a serious pessimization of spill code where we were saying that a spilled DEF operand was live into the subsequent instruction. This allows for substantially better code when spilling starts to happen. llvm-svn: 14993 --- llvm/lib/CodeGen/LiveIntervals.cpp | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) (limited to 'llvm/lib/CodeGen') diff --git a/llvm/lib/CodeGen/LiveIntervals.cpp b/llvm/lib/CodeGen/LiveIntervals.cpp index 9687e589812..ee988b10a40 100644 --- a/llvm/lib/CodeGen/LiveIntervals.cpp +++ b/llvm/lib/CodeGen/LiveIntervals.cpp @@ -60,11 +60,6 @@ namespace { EnableJoining("join-liveintervals", cl::desc("Join compatible live intervals"), cl::init(true)); - - cl::opt - EnableVirtVirtJoining("join-liveintervals-virtvirtjoining", - cl::desc("Join live intervals for virtreg pairs (buggy)"), - cl::init(false)); }; void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const @@ -251,7 +246,7 @@ std::vector LiveIntervals::addIntervalsForSpills( // use of the next instruction. Otherwise we end // after the use of this instruction. unsigned end = 1 + (mop.isDef() ? - getUseIndex(index+InstrSlots::NUM) : + getStoreIndex(index) : getUseIndex(index)); // create a new register for this spill @@ -545,11 +540,7 @@ void LiveIntervals::joinIntervals() Intervals::iterator intB = r2iB->second; // both A and B are virtual registers - - // FIXME: coallescing two virtual registers together is - // apparently broken. - if (EnableVirtVirtJoining && - MRegisterInfo::isVirtualRegister(intA->reg) && + if (MRegisterInfo::isVirtualRegister(intA->reg) && MRegisterInfo::isVirtualRegister(intB->reg)) { const TargetRegisterClass *rcA, *rcB; -- cgit v1.2.3