S390: [builtins] Migrate Math.log to TurboFan.

src/compiler/s390/code-generator-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/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1201 matching lines @@
                 v8::internal::Assembler::FIDBRA_ROUND_TOWARD_POS_INF);
       break;
     case kS390_TruncateFloat:
       __ fiebra(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
                 v8::internal::Assembler::FIDBRA_ROUND_TOWARD_0);
       break;
     //  Double operations
     case kS390_ModDouble:
       ASSEMBLE_FLOAT_MODULO();
       break;
+    case kS390_LogDouble: {
+      // TODO(bmeurer): We should really get rid of this special instruction,
+      // and generate a CallAddress instruction instead.
+      FrameScope scope(masm(), StackFrame::MANUAL);
+      __ PrepareCallCFunction(0, 1, kScratchReg);
+      __ MovToFloatParameter(i.InputDoubleRegister(0));
+      __ CallCFunction(ExternalReference::math_log_double_function(isolate()),
+                       0, 1);
+      // Move the result in the double result register.
+      __ MovFromFloatResult(i.OutputDoubleRegister());
+      break;
+    }
     case kS390_Neg:
       __ LoadComplementRR(i.OutputRegister(), i.InputRegister(0));
       break;
     case kS390_MaxDouble:
       ASSEMBLE_FLOAT_MAX(kScratchDoubleReg, kScratchReg);
       break;
     case kS390_MinDouble:
       ASSEMBLE_FLOAT_MIN(kScratchDoubleReg, kScratchReg);
       break;
     case kS390_AbsDouble:
@@ skipping 922 matching lines @@
       padding_size -= 2;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8