From 0be054b63d7413355c9e162a6f84d3130def1478 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Wed, 9 Feb 2011 00:25:36 +0000 Subject: [PATCH] Set an allocation hint when rematting before a COPY. This almost guarantees that the COPY will be coalesced. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125140 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/InlineSpiller.cpp | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/lib/CodeGen/InlineSpiller.cpp b/lib/CodeGen/InlineSpiller.cpp index 00ca3d5bb6..a1bd972d38 100644 --- a/lib/CodeGen/InlineSpiller.cpp +++ b/lib/CodeGen/InlineSpiller.cpp @@ -154,6 +154,10 @@ bool InlineSpiller::reMaterializeFor(MachineBasicBlock::iterator MI) { LiveInterval &NewLI = edit_->create(mri_, lis_, vrm_); NewLI.markNotSpillable(); + // Rematting for a copy: Set allocation hint to be the destination register. + if (MI->isCopy()) + mri_.setRegAllocationHint(NewLI.reg, 0, MI->getOperand(0).getReg()); + // Finally we can rematerialize OrigMI before MI. SlotIndex DefIdx = edit_->rematerializeAt(*MI->getParent(), MI, NewLI.reg, RM, lis_, tii_, tri_); -- 2.11.4.GIT