From 504c0cda91a6c6c8828c5a55f1516881b6f99e8c Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Wed, 16 Jun 2010 18:01:31 +0000 Subject: [PATCH] Improve comment to include that the use of a preg is also verboten in this situation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106119 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/MachineSink.cpp | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp index 61334fc1790..e2152d43a86 100644 --- a/lib/CodeGen/MachineSink.cpp +++ b/lib/CodeGen/MachineSink.cpp @@ -282,9 +282,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI, bool &SawStore) { if (MI->getParent() == SuccToSinkTo) return false; - // If the instruction to move defines a dead physical register which is live - // when leaving the basic block, don't move it because it could turn into a - // "zombie" define of that preg. E.g., EFLAGS. () + // If the instruction to move defines or uses a dead physical register which + // is live when leaving the basic block, don't move it because it could turn + // into a zombie define or misuse of that preg. E.g., EFLAGS. + // () for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) { const MachineOperand &MO = MI->getOperand(I); if (!MO.isReg()) continue; -- 2.34.1