s390: add new mul support on branches and deopts

src/compiler/s390/instruction-selector-s390.cc

 // Copyright 2015 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 "src/base/adapters.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 #include "src/s390/frames-s390.h"
 
@@ skipping 2032 matching lines @@
             switch (node->opcode()) {
               case IrOpcode::kInt32AddWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitWord32BinOp(selector, node, kS390_Add32,
                                         AddOperandMode, cont);
               case IrOpcode::kInt32SubWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitWord32BinOp(selector, node, kS390_Sub32,
                                         SubOperandMode, cont);
               case IrOpcode::kInt32MulWithOverflow:
-                cont->OverwriteAndNegateIfEqual(kNotEqual);
-                return VisitWord32BinOp(
-                    selector, node, kS390_Mul32WithOverflow,
-                    OperandMode::kInt32Imm | OperandMode::kAllowDistinctOps,
-                    cont);
+                if (CpuFeatures::IsSupported(MISC_INSTR_EXT2)) {
+                  cont->OverwriteAndNegateIfEqual(kOverflow);
+                  return VisitWord32BinOp(
+                      selector, node, kS390_Mul32,
+                      OperandMode::kAllowRRR | OperandMode::kAllowRM, cont);
+                } else {
+                  cont->OverwriteAndNegateIfEqual(kNotEqual);
+                  return VisitWord32BinOp(
+                      selector, node, kS390_Mul32WithOverflow,
+                      OperandMode::kInt32Imm | OperandMode::kAllowDistinctOps,
+                      cont);
+                }
               case IrOpcode::kInt32AbsWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitWord32UnaryOp(selector, node, kS390_Abs32,
                                           OperandMode::kNone, cont);
 #if V8_TARGET_ARCH_S390X
               case IrOpcode::kInt64AbsWithOverflow:
                 cont->OverwriteAndNegateIfEqual(kOverflow);
                 return VisitWord64UnaryOp(selector, node, kS390_Abs64,
                                           OperandMode::kNone, cont);
               case IrOpcode::kInt64AddWithOverflow:
@@ skipping 426 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8