[AMDGPU] Simplify vcc handling in copyPhysReg. NFC. (llvm#163340)

Author: jayfoad

llvm/lib/Target/AMDGPU/SIInstrInfo.cpp

@@ -865,22 +865,16 @@ void SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
       return;
     }
 
-    if (DestReg == AMDGPU::VCC_LO) {
-      if (AMDGPU::SReg_32RegClass.contains(SrcReg)) {
-        BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B32), AMDGPU::VCC_LO)
-          .addReg(SrcReg, getKillRegState(KillSrc));
-      } else {
+    if (!AMDGPU::SReg_32RegClass.contains(SrcReg)) {
+      if (DestReg == AMDGPU::VCC_LO) {
         // FIXME: Hack until VReg_1 removed.
         assert(AMDGPU::VGPR_32RegClass.contains(SrcReg));
         BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
-          .addImm(0)
-          .addReg(SrcReg, getKillRegState(KillSrc));
+            .addImm(0)
+            .addReg(SrcReg, getKillRegState(KillSrc));
+        return;
       }
 
-      return;
-    }
-
-    if (!AMDGPU::SReg_32RegClass.contains(SrcReg)) {
       reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
       return;
     }
@@ -898,22 +892,16 @@ void SIInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
       return;
     }
 
-    if (DestReg == AMDGPU::VCC) {
-      if (AMDGPU::SReg_64_EncodableRegClass.contains(SrcReg)) {
-        BuildMI(MBB, MI, DL, get(AMDGPU::S_MOV_B64), AMDGPU::VCC)
-          .addReg(SrcReg, getKillRegState(KillSrc));
-      } else {
+    if (!AMDGPU::SReg_64_EncodableRegClass.contains(SrcReg)) {
+      if (DestReg == AMDGPU::VCC) {
         // FIXME: Hack until VReg_1 removed.
         assert(AMDGPU::VGPR_32RegClass.contains(SrcReg));
         BuildMI(MBB, MI, DL, get(AMDGPU::V_CMP_NE_U32_e32))
-          .addImm(0)
-          .addReg(SrcReg, getKillRegState(KillSrc));
+            .addImm(0)
+            .addReg(SrcReg, getKillRegState(KillSrc));
+        return;
       }
 
-      return;
-    }
-
-    if (!AMDGPU::SReg_64_EncodableRegClass.contains(SrcReg)) {
       reportIllegalCopy(this, MBB, MI, DL, DestReg, SrcReg, KillSrc);
       return;
     }