R600/SI: Add an s_mov_b32 to patterns which use the M0RegClass

[oota-llvm.git] / lib / Target / R600 / SIInstrInfo.cpp

diff --git a/lib/Target/R600/SIInstrInfo.cpp b/lib/Target/R600/SIInstrInfo.cpp
index 8343362d116c499de2d9314d320b9f0d707ccec1..1a0010c03dcf47bf3ad80ca38c4ca1d9938847a6 100644 (file)
--- a/lib/Target/R600/SIInstrInfo.cpp
+++ b/lib/Target/R600/SIInstrInfo.cpp
@@ -326,26 +326,6 @@ SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
   unsigned Opcode;
   const int16_t *SubIndices;
 
-  if (AMDGPU::M0 == DestReg) {
-    // Check if M0 isn't already set to this value
-    for (MachineBasicBlock::reverse_iterator E = MBB.rend(),
-      I = MachineBasicBlock::reverse_iterator(MI); I != E; ++I) {
-
-      if (!I->definesRegister(AMDGPU::M0))
-        continue;
-
-      unsigned Opc = I->getOpcode();
-      if (Opc != TargetOpcode::COPY && Opc != AMDGPU::S_MOV_B32)
-        break;
-
-      if (!I->readsRegister(SrcReg))
-        break;
-
-      // The copy isn't necessary
-      return;
-    }
-  }
-
   if (AMDGPU::SReg_32RegClass.contains(DestReg)) {
     assert(AMDGPU::SReg_32RegClass.contains(SrcReg));
     BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), DestReg)