From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Tue, 6 Mar 2012 02:48:17 +0000 (+0000)
Subject: Add <imp-def> operands when reloading into physregs.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=3247af294996ff8588077c06505b64966ad41542;p=oota-llvm.git

Add <imp-def> operands when reloading into physregs.

When an instruction only writes sub-registers, it is still necessary to
add an <imp-def> operand for the super-register.  When reloading into a
virtual register, rewriting will add the operand, but when loading
directly into a virtual register, the <imp-def> operand is still
necessary.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152095 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 75b796e9e26..7a9de93268c 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -935,6 +935,8 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
         MIB = AddDReg(MIB, DestReg, ARM::dsub_1, RegState::DefineNoRead, TRI);
         MIB = AddDReg(MIB, DestReg, ARM::dsub_2, RegState::DefineNoRead, TRI);
         MIB = AddDReg(MIB, DestReg, ARM::dsub_3, RegState::DefineNoRead, TRI);
+        if (TargetRegisterInfo::isPhysicalRegister(DestReg))
+          MIB.addReg(DestReg, RegState::ImplicitDefine);
       }
     } else
       llvm_unreachable("Unknown reg class!");
@@ -953,6 +955,8 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
       MIB = AddDReg(MIB, DestReg, ARM::dsub_5, RegState::DefineNoRead, TRI);
       MIB = AddDReg(MIB, DestReg, ARM::dsub_6, RegState::DefineNoRead, TRI);
       MIB = AddDReg(MIB, DestReg, ARM::dsub_7, RegState::DefineNoRead, TRI);
+      if (TargetRegisterInfo::isPhysicalRegister(DestReg))
+        MIB.addReg(DestReg, RegState::ImplicitDefine);
     } else
       llvm_unreachable("Unknown reg class!");
     break;
diff --git a/test/CodeGen/ARM/neon_spill.ll b/test/CodeGen/ARM/neon_spill.ll
index 677b9c2aa14..277bd05ba3b 100644
--- a/test/CodeGen/ARM/neon_spill.ll
+++ b/test/CodeGen/ARM/neon_spill.ll
@@ -1,4 +1,5 @@
 ; RUN: llc < %s -verify-machineinstrs
+; RUN: llc < %s -verify-machineinstrs -O0
 ; PR12177
 ;
 ; This test case spills a QQQQ register.