PPC/s390: [builtins] Introduce proper Float64Tan operator.

src/crankshaft/s390/lithium-codegen-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 "src/crankshaft/s390/lithium-codegen-s390.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 5186 matching lines @@
   DoubleRegister value_reg = ToDoubleRegister(instr->value());
   Register result_reg = ToRegister(instr->result());
   __ lgdr(result_reg, value_reg);
   if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
     __ srlg(result_reg, result_reg, Operand(32));
   } else {
     __ llgfr(result_reg, result_reg);
   }
 }
 
-void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
-  Register hi_reg = ToRegister(instr->hi());
-  Register lo_reg = ToRegister(instr->lo());
-  DoubleRegister result_reg = ToDoubleRegister(instr->result());
-  Register scratch = scratch0();
-
-  // Combine hi_reg:lo_reg into a single 64-bit register.
-  __ sllg(scratch, hi_reg, Operand(32));
-  __ lr(scratch, lo_reg);
-
-  // Bitwise convert from GPR to FPR
-  __ ldgr(result_reg, scratch);
-}
-
 void LCodeGen::DoAllocate(LAllocate* instr) {
   class DeferredAllocate final : public LDeferredCode {
    public:
     DeferredAllocate(LCodeGen* codegen, LAllocate* instr)
         : LDeferredCode(codegen), instr_(instr) {}
     void Generate() override { codegen()->DoDeferredAllocate(instr_); }
     LInstruction* instr() override { return instr_; }
 
    private:
     LAllocate* instr_;
@@ skipping 470 matching lines @@
   __ LoadP(result,
            FieldMemOperand(scratch, FixedArray::kHeaderSize - kPointerSize));
   __ bind(deferred->exit());
   __ bind(&done);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8