From ed2185e171a86b8c0e166803fd4066383a6cff08 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Tue, 6 Jul 2010 23:26:25 +0000 Subject: Convert INSERT_SUBREG to COPY in TwoAddressInstructionPass. INSERT_SUBREG will now only appear in SSA machine instructions. Fix the handling of partial redefs in ProcessImplicitDefs. This is now relevant since partial redef COPY instructions appear. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107726 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/TwoAddressInstructionPass.cpp | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'lib/CodeGen/TwoAddressInstructionPass.cpp') diff --git a/lib/CodeGen/TwoAddressInstructionPass.cpp b/lib/CodeGen/TwoAddressInstructionPass.cpp index 4d4318df0d..efe14e6b28 100644 --- a/lib/CodeGen/TwoAddressInstructionPass.cpp +++ b/lib/CodeGen/TwoAddressInstructionPass.cpp @@ -1218,6 +1218,19 @@ bool TwoAddressInstructionPass::runOnMachineFunction(MachineFunction &MF) { DEBUG(dbgs() << "\t\trewrite to:\t" << *mi); } + // Rewrite INSERT_SUBREG as COPY now that we no longer need SSA form. + if (mi->isInsertSubreg()) { + // From %reg = INSERT_SUBREG %reg, %subreg, subidx + // To %reg:subidx = COPY %subreg + unsigned SubIdx = mi->getOperand(3).getImm(); + mi->RemoveOperand(3); + assert(mi->getOperand(0).getSubReg() == 0 && "Unexpected subreg idx"); + mi->getOperand(0).setSubReg(SubIdx); + mi->RemoveOperand(1); + mi->setDesc(TII->get(TargetOpcode::COPY)); + DEBUG(dbgs() << "\t\tconvert to:\t" << *mi); + } + // Clear TiedOperands here instead of at the top of the loop // since most instructions do not have tied operands. TiedOperands.clear(); -- cgit v1.2.3