From 728cde2865815411056bed202befbe86bb81628d Mon Sep 17 00:00:00 2001
From: Matt Arsenault <Matthew.Arsenault@amd.com>
Date: Fri, 25 Sep 2015 22:21:19 +0000
Subject: [PATCH] AMDGPU: Construct new buffer instruction when moving SMRD

It's easier to understand creating a full instruction
than the current situation where sometimes a new
instruction is created and sometimes it is awkwardly
mutated in place.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248627 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/AMDGPU/SIInstrInfo.cpp | 67 +++++++++++++++++++++------------------
 lib/Target/AMDGPU/SIInstrInfo.h   |  3 +-
 2 files changed, 39 insertions(+), 31 deletions(-)

diff --git a/lib/Target/AMDGPU/SIInstrInfo.cpp b/lib/Target/AMDGPU/SIInstrInfo.cpp
index 865e5cc6b64..63fc0c7f74c 100644
--- a/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -2057,7 +2057,9 @@ void SIInstrInfo::splitSMRD(MachineInstr *MI,
     .addImm(SubHi);
 }
 
-void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI) const {
+void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI,
+                                 MachineRegisterInfo &MRI,
+                                 SmallVectorImpl<MachineInstr *> &Worklist) const {
   MachineBasicBlock *MBB = MI->getParent();
   int DstIdx = AMDGPU::getNamedOperandIdx(MI->getOpcode(), AMDGPU::OpName::dst);
   assert(DstIdx != -1);
@@ -2109,32 +2111,36 @@ void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI) con
       BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::S_MOV_B32), DWord3)
               .addImm(RsrcDataFormat >> 32);
       BuildMI(*MBB, MI, MI->getDebugLoc(), get(AMDGPU::REG_SEQUENCE), SRsrc)
-              .addReg(DWord0)
-              .addImm(AMDGPU::sub0)
-              .addReg(DWord1)
-              .addImm(AMDGPU::sub1)
-              .addReg(DWord2)
-              .addImm(AMDGPU::sub2)
-              .addReg(DWord3)
-              .addImm(AMDGPU::sub3);
-      MI->setDesc(get(NewOpcode));
-      if (MI->getOperand(2).isReg()) {
-        MI->getOperand(2).setReg(SRsrc);
-      } else {
-        MI->getOperand(2).ChangeToRegister(SRsrc, false);
-      }
-      MI->addOperand(*MBB->getParent(), MachineOperand::CreateImm(0));
-      MI->addOperand(*MBB->getParent(), MachineOperand::CreateImm(ImmOffset));
-      MI->addOperand(*MBB->getParent(), MachineOperand::CreateImm(0)); // glc
-      MI->addOperand(*MBB->getParent(), MachineOperand::CreateImm(0)); // slc
-      MI->addOperand(*MBB->getParent(), MachineOperand::CreateImm(0)); // tfe
-
-      const TargetRegisterClass *NewDstRC =
-          RI.getRegClass(get(NewOpcode).OpInfo[0].RegClass);
-
-      unsigned DstReg = MI->getOperand(0).getReg();
+        .addReg(DWord0)
+        .addImm(AMDGPU::sub0)
+        .addReg(DWord1)
+        .addImm(AMDGPU::sub1)
+        .addReg(DWord2)
+        .addImm(AMDGPU::sub2)
+        .addReg(DWord3)
+        .addImm(AMDGPU::sub3);
+
+      const MCInstrDesc &NewInstDesc = get(NewOpcode);
+      const TargetRegisterClass *NewDstRC
+        = RI.getRegClass(NewInstDesc.OpInfo[0].RegClass);
       unsigned NewDstReg = MRI.createVirtualRegister(NewDstRC);
+      unsigned DstReg = MI->getOperand(0).getReg();
       MRI.replaceRegWith(DstReg, NewDstReg);
+
+      MachineInstr *NewInst =
+        BuildMI(*MBB, MI, MI->getDebugLoc(), NewInstDesc, NewDstReg)
+        .addOperand(MI->getOperand(1)) // sbase
+        .addReg(SRsrc)
+        .addImm(0)
+        .addImm(ImmOffset)
+        .addImm(0) // glc
+        .addImm(0) // slc
+        .addImm(0) // tfe
+        .setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
+      MI->eraseFromParent();
+
+      legalizeOperands(NewInst);
+      addUsersToMoveToVALUWorklist(NewDstReg, MRI, Worklist);
       break;
     }
     case 32: {
@@ -2142,8 +2148,8 @@ void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI) con
       splitSMRD(MI, &AMDGPU::SReg_128RegClass, AMDGPU::S_LOAD_DWORDX4_IMM,
                 AMDGPU::S_LOAD_DWORDX4_SGPR, Lo, Hi);
       MI->eraseFromParent();
-      moveSMRDToVALU(Lo, MRI);
-      moveSMRDToVALU(Hi, MRI);
+      moveSMRDToVALU(Lo, MRI, Worklist);
+      moveSMRDToVALU(Hi, MRI, Worklist);
       break;
     }
 
@@ -2152,8 +2158,8 @@ void SIInstrInfo::moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI) con
       splitSMRD(MI, &AMDGPU::SReg_256RegClass, AMDGPU::S_LOAD_DWORDX8_IMM,
                 AMDGPU::S_LOAD_DWORDX8_SGPR, Lo, Hi);
       MI->eraseFromParent();
-      moveSMRDToVALU(Lo, MRI);
-      moveSMRDToVALU(Hi, MRI);
+      moveSMRDToVALU(Lo, MRI, Worklist);
+      moveSMRDToVALU(Hi, MRI, Worklist);
       break;
     }
   }
@@ -2175,7 +2181,8 @@ void SIInstrInfo::moveToVALU(MachineInstr &TopInst) const {
     switch (Opcode) {
     default:
       if (isSMRD(Inst->getOpcode())) {
-        moveSMRDToVALU(Inst, MRI);
+        moveSMRDToVALU(Inst, MRI, Worklist);
+        continue;
       }
       break;
     case AMDGPU::S_AND_B64:
diff --git a/lib/Target/AMDGPU/SIInstrInfo.h b/lib/Target/AMDGPU/SIInstrInfo.h
index c12caa7a21a..d1d964fd16b 100644
--- a/lib/Target/AMDGPU/SIInstrInfo.h
+++ b/lib/Target/AMDGPU/SIInstrInfo.h
@@ -305,7 +305,8 @@ public:
                  unsigned HalfImmOp, unsigned HalfSGPROp,
                  MachineInstr *&Lo, MachineInstr *&Hi) const;
 
-  void moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI) const;
+  void moveSMRDToVALU(MachineInstr *MI, MachineRegisterInfo &MRI,
+                      SmallVectorImpl<MachineInstr *> &Worklist) const;
 
   /// \brief Replace this instruction's opcode with the equivalent VALU
   /// opcode.  This function will also move the users of \p MI to the
-- 
2.11.0