From 03cd75eedb8d26847464e4fdb815e4ca2a556676 Mon Sep 17 00:00:00 2001
From: Christian Konig <christian.koenig@amd.com>
Date: Tue, 26 Mar 2013 14:03:50 +0000
Subject: [PATCH] R600/SI: replace WQM intrinsic
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Just enable WQM when we see an LDS interpolation instruction.

Signed-off-by: Christian König <christian.koenig@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178019 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/R600/SIISelLowering.cpp     | 13 -------------
 lib/Target/R600/SIISelLowering.h       |  3 ---
 lib/Target/R600/SIInstructions.td      | 11 -----------
 lib/Target/R600/SIIntrinsics.td        |  1 -
 lib/Target/R600/SILowerControlFlow.cpp | 14 ++++++++++++++
 5 files changed, 14 insertions(+), 28 deletions(-)

diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
index 93f8c38a3ac..c4cdccc8eab 100644
--- a/lib/Target/R600/SIISelLowering.cpp
+++ b/lib/Target/R600/SIISelLowering.cpp
@@ -208,28 +208,15 @@ SDValue SITargetLowering::LowerFormalArguments(
 
 MachineBasicBlock * SITargetLowering::EmitInstrWithCustomInserter(
     MachineInstr * MI, MachineBasicBlock * BB) const {
-  MachineRegisterInfo & MRI = BB->getParent()->getRegInfo();
-  MachineBasicBlock::iterator I = MI;
 
   switch (MI->getOpcode()) {
   default:
     return AMDGPUTargetLowering::EmitInstrWithCustomInserter(MI, BB);
   case AMDGPU::BRANCH: return BB;
-  case AMDGPU::SI_WQM:
-    LowerSI_WQM(MI, *BB, I, MRI);
-    break;
   }
   return BB;
 }
 
-void SITargetLowering::LowerSI_WQM(MachineInstr *MI, MachineBasicBlock &BB,
-    MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const {
-  BuildMI(BB, I, BB.findDebugLoc(I), TII->get(AMDGPU::S_WQM_B64), AMDGPU::EXEC)
-          .addReg(AMDGPU::EXEC);
-
-  MI->eraseFromParent();
-}
-
 EVT SITargetLowering::getSetCCResultType(EVT VT) const {
   return MVT::i1;
 }
diff --git a/lib/Target/R600/SIISelLowering.h b/lib/Target/R600/SIISelLowering.h
index d65622526f2..5ad2f40f0f3 100644
--- a/lib/Target/R600/SIISelLowering.h
+++ b/lib/Target/R600/SIISelLowering.h
@@ -24,9 +24,6 @@ class SITargetLowering : public AMDGPUTargetLowering {
   const SIInstrInfo * TII;
   const TargetRegisterInfo * TRI;
 
-  void LowerSI_WQM(MachineInstr *MI, MachineBasicBlock &BB,
-              MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const;
-
   SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
   SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const;
 
diff --git a/lib/Target/R600/SIInstructions.td b/lib/Target/R600/SIInstructions.td
index dc75f012495..edd5e46be36 100644
--- a/lib/Target/R600/SIInstructions.td
+++ b/lib/Target/R600/SIInstructions.td
@@ -1067,17 +1067,6 @@ def LOAD_CONST : AMDGPUShaderInst <
   [(set GPRF32:$dst, (int_AMDGPU_load_const imm:$src))]
 >;
 
-let usesCustomInserter = 1 in {
-
-def SI_WQM : InstSI <
-  (outs),
-  (ins),
-  "SI_WQM",
-  [(int_SI_wqm)]
->;
-
-} // end usesCustomInserter 
-
 // SI Psuedo instructions. These are used by the CFG structurizer pass
 // and should be lowered to ISA instructions prior to codegen.
 
diff --git a/lib/Target/R600/SIIntrinsics.td b/lib/Target/R600/SIIntrinsics.td
index 33bb8157b43..a489d65935b 100644
--- a/lib/Target/R600/SIIntrinsics.td
+++ b/lib/Target/R600/SIIntrinsics.td
@@ -18,7 +18,6 @@ let TargetPrefix = "SI", isTarget = 1 in {
   def int_SI_export : Intrinsic <[], [llvm_i32_ty, llvm_i32_ty, llvm_i32_ty, llvm_i32_ty, llvm_i32_ty, llvm_float_ty, llvm_float_ty, llvm_float_ty, llvm_float_ty], []>;
   def int_SI_load_const : Intrinsic <[llvm_float_ty], [llvm_v16i8_ty, llvm_i32_ty], [IntrReadMem]>;
   def int_SI_vs_load_input : Intrinsic <[llvm_v4f32_ty], [llvm_v16i8_ty, llvm_i16_ty, llvm_i32_ty], [IntrReadMem]> ;
-  def int_SI_wqm : Intrinsic <[], [], []>;
 
   class Sample : Intrinsic <[llvm_v4f32_ty], [llvm_i32_ty, llvm_anyvector_ty, llvm_v32i8_ty, llvm_v16i8_ty, llvm_i32_ty], [IntrReadMem]>;
 
diff --git a/lib/Target/R600/SILowerControlFlow.cpp b/lib/Target/R600/SILowerControlFlow.cpp
index 6b3f6261dfa..2b60eb9fb37 100644
--- a/lib/Target/R600/SILowerControlFlow.cpp
+++ b/lib/Target/R600/SILowerControlFlow.cpp
@@ -410,6 +410,7 @@ void SILowerControlFlowPass::IndirectDst(MachineInstr &MI) {
 bool SILowerControlFlowPass::runOnMachineFunction(MachineFunction &MF) {
 
   bool HaveKill = false;
+  bool NeedWQM = false;
   unsigned Depth = 0;
 
   for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
@@ -479,9 +480,22 @@ bool SILowerControlFlowPass::runOnMachineFunction(MachineFunction &MF) {
         case AMDGPU::SI_INDIRECT_DST_V16:
           IndirectDst(MI);
           break;
+
+        case AMDGPU::V_INTERP_P1_F32:
+        case AMDGPU::V_INTERP_P2_F32:
+        case AMDGPU::V_INTERP_MOV_F32:
+          NeedWQM = true;
+          break;
+
       }
     }
   }
 
+  if (NeedWQM) {
+    MachineBasicBlock &MBB = MF.front();
+    BuildMI(MBB, MBB.getFirstNonPHI(), DebugLoc(), TII->get(AMDGPU::S_WQM_B64),
+            AMDGPU::EXEC).addReg(AMDGPU::EXEC);
+  }
+
   return true;
 }