s390: exploit new mul in TF

src/s390/simulator-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.
 
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #if V8_TARGET_ARCH_S390
 
@@ skipping 1282 matching lines @@
   EvalTable[CGF] = &Simulator::Evaluate_CGF;
   EvalTable[CLGF] = &Simulator::Evaluate_CLGF;
   EvalTable[LTGF] = &Simulator::Evaluate_LTGF;
   EvalTable[CGH] = &Simulator::Evaluate_CGH;
   EvalTable[PFD] = &Simulator::Evaluate_PFD;
   EvalTable[STRV] = &Simulator::Evaluate_STRV;
   EvalTable[STRVH] = &Simulator::Evaluate_STRVH;
   EvalTable[BCTG] = &Simulator::Evaluate_BCTG;
   EvalTable[STY] = &Simulator::Evaluate_STY;
   EvalTable[MSY] = &Simulator::Evaluate_MSY;
+  EvalTable[MSC] = &Simulator::Evaluate_MSC;
   EvalTable[NY] = &Simulator::Evaluate_NY;
   EvalTable[CLY] = &Simulator::Evaluate_CLY;
   EvalTable[OY] = &Simulator::Evaluate_OY;
   EvalTable[XY] = &Simulator::Evaluate_XY;
   EvalTable[LY] = &Simulator::Evaluate_LY;
   EvalTable[CY] = &Simulator::Evaluate_CY;
   EvalTable[AY] = &Simulator::Evaluate_AY;
   EvalTable[SY] = &Simulator::Evaluate_SY;
   EvalTable[MFY] = &Simulator::Evaluate_MFY;
   EvalTable[ALY] = &Simulator::Evaluate_ALY;
@@ skipping 6837 matching lines @@
   DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
   int64_t b2_val = (b2 == 0) ? 0 : get_register(b2);
   int64_t x2_val = (x2 == 0) ? 0 : get_register(x2);
   intptr_t d2_val = d2;
   int32_t mem_val = ReadW(b2_val + d2_val + x2_val, instr);
   int32_t r1_val = get_low_register<int32_t>(r1);
   set_low_register(r1, mem_val * r1_val);
   return length;
 }
 
+EVALUATE(MSC) {
+  DCHECK_OPCODE(MSC);
+  DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
+  int64_t b2_val = (b2 == 0) ? 0 : get_register(b2);
+  int64_t x2_val = (x2 == 0) ? 0 : get_register(x2);
+  intptr_t d2_val = d2;
+  int32_t mem_val = ReadW(b2_val + d2_val + x2_val, instr);
+  int32_t r1_val = get_low_register<int32_t>(r1);
+  int64_t result64 =
+      static_cast<int64_t>(r1_val) * static_cast<int64_t>(mem_val);
+  int32_t result32 = static_cast<int32_t>(result64);
+  bool isOF = (static_cast<int64_t>(result32) != result64);
+  SetS390ConditionCode<int32_t>(result32, 0);
+  SetS390OverflowCode(isOF);
+  set_low_register(r1, result32);
+  set_low_register(r1, mem_val * r1_val);
+  return length;
+}
+
 EVALUATE(NY) {
   DCHECK_OPCODE(NY);
   DECODE_RXY_A_INSTRUCTION(r1, x2, b2, d2);
   int64_t x2_val = (x2 == 0) ? 0 : get_register(x2);
   int64_t b2_val = (b2 == 0) ? 0 : get_register(b2);
   int32_t alu_out = get_low_register<int32_t>(r1);
   int32_t mem_val = ReadW(b2_val + x2_val + d2, instr);
   alu_out &= mem_val;
   SetS390BitWiseConditionCode<uint32_t>(alu_out);
   set_low_register(r1, alu_out);
@@ skipping 1655 matching lines @@
   return 0;
 }
 
 #undef EVALUATE
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // USE_SIMULATOR
 #endif  // V8_TARGET_ARCH_S390