S390: Use FIEBRA/FIDBRA for FP Floor/Ceil

src/s390/disasm-s390.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 290 matching lines @@
     }
   }
 
   UNREACHABLE();
   return -1;
 }
 
 int Decoder::FormatMask(Instruction* instr, const char* format) {
   DCHECK(format[0] == 'm');
   int32_t value = 0;
-  if ((format[1] == '1')) {  // prints the mask format in bit 8-12
+  if ((format[1] == '1')) {  // prints the mask format in bits 8-12
     value = reinterpret_cast<RRInstruction*>(instr)->R1Value();
     out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", value);
     return 2;
-  } else if (format[1] == '2') {  // mask format in bit 16 - 19
+  } else if (format[1] == '2') {  // mask format in bits 16-19
     value = reinterpret_cast<RXInstruction*>(instr)->B2Value();
     out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", value);
     return 2;
+  } else if (format[1] == '3') {  // mask format in bits 20-23
+    value = reinterpret_cast<RRFInstruction*>(instr)->M4Value();
+    out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", value);
+    return 2;
   }
 
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", value);
   return 2;
 }
 
 int Decoder::FormatDisplacement(Instruction* instr, const char* format) {
   DCHECK(format[0] == 'd');
 
   if (format[1] == '1') {  // displacement in 20-31
@@ skipping 655 matching lines @@
       break;
     case MADBR:
       Format(instr, "madbr\t'f3,'f5,'f6");
       break;
     case MSDBR:
       Format(instr, "msdbr\t'f3,'f5,'f6");
       break;
     case FLOGR:
       Format(instr, "flogr\t'r5,'r6");
       break;
+    case FIEBRA:
+      Format(instr, "fiebra\t'f5,'m2,'f6,'m3");
+      break;
+    case FIDBRA:
+      Format(instr, "fidbra\t'f5,'m2,'f6,'m3");
+      break;
     // TRAP4 is used in calling to native function. it will not be generated
     // in native code.
     case TRAP4: {
       Format(instr, "trap4");
       break;
     }
     default:
       return false;
   }
   return true;
@@ skipping 398 matching lines @@
     byte* prev_pc = pc;
     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_S390