From 19b6486d3891c8a02a301aa1b44348a420772fcf Mon Sep 17 00:00:00 2001 From: Alkis Evlogimenos Date: Tue, 13 Jan 2004 06:24:30 +0000 Subject: Correctly compute live variable information for physical registers when an implicitely defined register is later used by an alias. For example: call foo %reg1024 = mov %AL The call implicitely defines EAX but only AL is used. Before this fix no information was available on AL. Now EAX and all its aliases except AL get defined and die at the call instruction whereas AL lives to be killed by the assignment. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10813 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/LiveIntervalAnalysis.cpp | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp') diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index fe47a3661d..f8c83f18ea 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -261,6 +261,8 @@ void LiveIntervals::handleRegisterDef(MachineBasicBlock* mbb, if (reg < MRegisterInfo::FirstVirtualRegister) { if (allocatableRegisters_[reg]) { handlePhysicalRegisterDef(mbb, mi, reg); + for (const unsigned* as = mri_->getAliasSet(reg); *as; ++as) + handlePhysicalRegisterDef(mbb, mi, *as); } } else { @@ -300,10 +302,8 @@ void LiveIntervals::computeIntervals() instr->print(std::cerr, *tm_);); // handle implicit defs - for (const unsigned* id = tid.ImplicitDefs; *id; ++id) { - unsigned physReg = *id; - handlePhysicalRegisterDef(mbb, mi, physReg); - } + for (const unsigned* id = tid.ImplicitDefs; *id; ++id) + handleRegisterDef(mbb, mi, *id); // handle explicit defs for (int i = instr->getNumOperands() - 1; i >= 0; --i) { @@ -312,14 +312,9 @@ void LiveIntervals::computeIntervals() if (!mop.isRegister()) continue; - unsigned reg = mop.getAllocatedRegNum(); // handle defs - build intervals - if (mop.isDef()) { - if (reg < MRegisterInfo::FirstVirtualRegister) - handlePhysicalRegisterDef(mbb, mi, reg); - else - handleVirtualRegisterDef(mbb, mi, reg); - } + if (mop.isDef()) + handleRegisterDef(mbb, mi, mop.getAllocatedRegNum()); } } } -- cgit v1.2.3-18-g5258