PPC: [wasm] Int64Lowering of Int64Sub.

src/ppc/disasm-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Disassembler object is used to disassemble a block of code instruction by
 // instruction. The default implementation of the NameConverter object can be
 // overriden to modify register names or to do symbol lookup on addresses.
 //
 // The example below will disassemble a block of code and print it to stdout.
 //
@@ skipping 639 matching lines @@
 #if V8_TARGET_ARCH_PPC64
     case SLDX: {
       Format(instr, "sld'.   'ra, 'rs, 'rb");
       return;
     }
 #endif
     case SUBFCX: {
       Format(instr, "subfc'. 'rt, 'ra, 'rb");
       return;
     }
+    case SUBFEX: {
+      Format(instr, "subfe'. 'rt, 'ra, 'rb");
+      return;
+    }
     case ADDCX: {
       Format(instr, "addc'.   'rt, 'ra, 'rb");
       return;
     }
     case ADDEX: {
       Format(instr, "adde'.   'rt, 'ra, 'rb");
       return;
     }
     case CNTLZWX: {
       Format(instr, "cntlzw'. 'ra, 'rs");
@@ skipping 789 matching lines @@
     pc += d.InstructionDecode(buffer, pc);
     v8::internal::PrintF(f, "%p    %08x      %s\n", prev_pc,
                          *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_PPC