From 31b9c44cc13bb686010cf6bfbeef8745c39939b9 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Tue, 11 May 2010 00:20:03 +0000 Subject: It's not safe eliminate copies where src and dst have different sub-register indices. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/ProcessImplicitDefs.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'lib/CodeGen/ProcessImplicitDefs.cpp') diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp index 75875d2835..62f525fa1d 100644 --- a/lib/CodeGen/ProcessImplicitDefs.cpp +++ b/lib/CodeGen/ProcessImplicitDefs.cpp @@ -46,7 +46,7 @@ bool ProcessImplicitDefs::CanTurnIntoImplicitDef(MachineInstr *MI, const TargetInstrInfo *tii_) { unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) && - Reg == SrcReg) + Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) return true; if (OpIdx == 2 && MI->isSubregToReg()) @@ -220,7 +220,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) { // Turn a copy use into an implicit_def. unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) && - Reg == SrcReg) { + Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) { RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF)); bool isKill = false; -- cgit v1.2.3-70-g09d2