From 04764deac8a05a74ff9399cf406f5525ff68543d Mon Sep 17 00:00:00 2001 From: Owen Anderson Date: Wed, 8 Oct 2008 04:30:51 +0000 Subject: [PATCH] Fix the case where an instruction is not properly marked as using all registers that alias its inputs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57286 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/RegAllocLocal.cpp | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/RegAllocLocal.cpp b/lib/CodeGen/RegAllocLocal.cpp index 82691baf3db..479245224ea 100644 --- a/lib/CodeGen/RegAllocLocal.cpp +++ b/lib/CodeGen/RegAllocLocal.cpp @@ -575,8 +575,26 @@ void RALocal::ComputeLocalLiveness(MachineBasicBlock& MBB) { // them for later. Also, we have to process these // _before_ processing the defs, since an instr // uses regs before it defs them. - if (MO.isReg() && MO.getReg() && MO.isUse()) + if (MO.isReg() && MO.getReg() && MO.isUse()) { LastUseDef[MO.getReg()] = std::make_pair(I, i); + + + if (TargetRegisterInfo::isVirtualRegister(MO.getReg())) continue; + + const unsigned* subregs = TRI->getAliasSet(MO.getReg()); + if (subregs) { + while (*subregs) { + DenseMap >::iterator + alias = LastUseDef.find(*subregs); + + if (alias != LastUseDef.end() && + alias->second.first != I) + LastUseDef[*subregs] = std::make_pair(I, i); + + ++subregs; + } + } + } } for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {