From 0fb215a154a5f9f54eea1ce8b006ba9bce5defa1 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Mon, 11 Apr 2011 18:08:10 +0000 Subject: Don't add live ranges for sub-registers when clobbering a physical register. Both coalescing and register allocation already check aliases for interference, so these extra segments are only slowing us down. This speeds up both linear scan and the greedy register allocator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129283 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/LiveIntervalAnalysis.cpp | 7 ------- 1 file changed, 7 deletions(-) (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp') diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index c77ae1b7a7..7a8ca63ce7 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -578,13 +578,6 @@ void LiveIntervals::handleRegisterDef(MachineBasicBlock *MBB, CopyMI = MI; handlePhysicalRegisterDef(MBB, MI, MIIdx, MO, getOrCreateInterval(MO.getReg()), CopyMI); - // Def of a register also defines its sub-registers. - for (const unsigned* AS = tri_->getSubRegisters(MO.getReg()); *AS; ++AS) - // If MI also modifies the sub-register explicitly, avoid processing it - // more than once. Do not pass in TRI here so it checks for exact match. - if (!MI->definesRegister(*AS)) - handlePhysicalRegisterDef(MBB, MI, MIIdx, MO, - getOrCreateInterval(*AS), 0); } } -- cgit v1.2.3-70-g09d2