[llvm] r361167 - R600: Fix unconditional return in loop

[Matt Arsenault via llvm-commits]

Author: arsenm
Date: Mon May 20 09:22:11 2019
New Revision: 361167

URL: http://llvm.org/viewvc/llvm-project?rev=361167&view=rev
Log:
R600: Fix unconditional return in loop

Modified:
    llvm/trunk/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp

Modified: llvm/trunk/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp?rev=361167&r1=361166&r2=361167&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/R600OptimizeVectorRegisters.cpp Mon May 20 09:22:11 2019
@@ -56,17 +56,12 @@ using namespace llvm;
 
 #define DEBUG_TYPE "vec-merger"
 
-static bool
-isImplicitlyDef(MachineRegisterInfo &MRI, unsigned Reg) {
-  for (MachineRegisterInfo::def_instr_iterator It = MRI.def_instr_begin(Reg),
-      E = MRI.def_instr_end(); It != E; ++It) {
-    return (*It).isImplicitDef();
-  }
-  if (MRI.isReserved(Reg)) {
+static bool isImplicitlyDef(MachineRegisterInfo &MRI, unsigned Reg) {
+  assert(MRI.isSSA());
+  if (TargetRegisterInfo::isPhysicalRegister(Reg))
     return false;
-  }
-  llvm_unreachable("Reg without a def");
-  return false;
+  const MachineInstr *MI = MRI.getUniqueVRegDef(Reg);
+  return MI && MI->isImplicitDef();
 }
 
 namespace {