Streamline getRegUsedAsCallDest()

Author: atrosinenko

bolt/lib/Target/AArch64/AArch64MCPlusBuilder.cpp

@@ -284,23 +284,6 @@ class AArch64MCPlusBuilder : public MCPlusBuilder {
     IsAuthenticatedInternally = false;
 
     switch (Inst.getOpcode()) {
-    case AArch64::B:
-    case AArch64::BL:
-      assert(Inst.getOperand(0).isExpr());
-      return getNoRegister();
-    case AArch64::Bcc:
-    case AArch64::CBNZW:
-    case AArch64::CBNZX:
-    case AArch64::CBZW:
-    case AArch64::CBZX:
-      assert(Inst.getOperand(1).isExpr());
-      return getNoRegister();
-    case AArch64::TBNZW:
-    case AArch64::TBNZX:
-    case AArch64::TBZW:
-    case AArch64::TBZX:
-      assert(Inst.getOperand(2).isExpr());
-      return getNoRegister();
     case AArch64::BR:
     case AArch64::BLR:
       return Inst.getOperand(0).getReg();
@@ -315,7 +298,9 @@ class AArch64MCPlusBuilder : public MCPlusBuilder {
       IsAuthenticatedInternally = true;
       return Inst.getOperand(0).getReg();
     default:
-      llvm_unreachable("Unhandled call instruction");
+      if (isIndirectCall(Inst) || isIndirectBranch(Inst))
+        llvm_unreachable("Unhandled indirect branch");
+      return getNoRegister();
     }
   }