From 8eea48a43da9e861841abe869c5f3215c1f42d27 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Mon, 15 Feb 2010 22:03:29 +0000 Subject: Fix PR6300. A virtual register can be used before it is defined in the same MBB if the MBB is part of a loop. Teach the implicit-def pass about this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96279 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/ProcessImplicitDefs.cpp | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'lib/CodeGen/ProcessImplicitDefs.cpp') diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp index e3df2e4..d7179b3 100644 --- a/lib/CodeGen/ProcessImplicitDefs.cpp +++ b/lib/CodeGen/ProcessImplicitDefs.cpp @@ -205,10 +205,9 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) { // Process each use instruction once. for (MachineRegisterInfo::use_iterator UI = mri_->use_begin(Reg), UE = mri_->use_end(); UI != UE; ++UI) { - MachineInstr *RMI = &*UI; - MachineBasicBlock *RMBB = RMI->getParent(); - if (RMBB == MBB) + if (UI.getOperand().isUndef()) continue; + MachineInstr *RMI = &*UI; if (ModInsts.insert(RMI)) RUses.push_back(RMI); } -- cgit v1.1