[builtins] Introduce proper Float64Exp operator.

src/mips64/codegen-mips64.cc

Index: src/mips64/codegen-mips64.cc
diff --git a/src/mips64/codegen-mips64.cc b/src/mips64/codegen-mips64.cc
index 678f606cb5716135c0e66a135f35da0c3d390473..a8f58904014b0f6f5a1cd2ea99ecdd992973ecae 100644
--- a/src/mips64/codegen-mips64.cc
+++ b/src/mips64/codegen-mips64.cc
@@ -17,59 +17,6 @@ namespace internal {
 #define __ masm.
 
 
-#if defined(USE_SIMULATOR)
-byte* fast_exp_mips_machine_code = nullptr;
-double fast_exp_simulator(double x, Isolate* isolate) {
-  return Simulator::current(isolate)->CallFP(fast_exp_mips_machine_code, x, 0);
-}
-#endif
-
-
-UnaryMathFunctionWithIsolate CreateExpFunction(Isolate* isolate) {
-  size_t actual_size;
-  byte* buffer =
-      static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
-  if (buffer == nullptr) return nullptr;
-  ExternalReference::InitializeMathExpData();
-
-  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
-                      CodeObjectRequired::kNo);
-
-  {
-    DoubleRegister input = f12;
-    DoubleRegister result = f0;
-    DoubleRegister double_scratch1 = f4;
-    DoubleRegister double_scratch2 = f6;
-    Register temp1 = a4;
-    Register temp2 = a5;
-    Register temp3 = a6;
-
-    __ MovFromFloatParameter(input);
-    __ Push(temp3, temp2, temp1);
-    MathExpGenerator::EmitMathExp(
-        &masm, input, result, double_scratch1, double_scratch2,
-        temp1, temp2, temp3);
-    __ Pop(temp3, temp2, temp1);
-    __ MovToFloatResult(result);
-    __ Ret();
-  }
-
-  CodeDesc desc;
-  masm.GetCode(&desc);
-  DCHECK(!RelocInfo::RequiresRelocation(desc));
-
-  Assembler::FlushICache(isolate, buffer, actual_size);
-  base::OS::ProtectCode(buffer, actual_size);
-
-#if !defined(USE_SIMULATOR)
-  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
-#else
-  fast_exp_mips_machine_code = buffer;
-  return &fast_exp_simulator;
-#endif
-}
-
-
 #if defined(V8_HOST_ARCH_MIPS)
 MemCopyUint8Function CreateMemCopyUint8Function(Isolate* isolate,
                                                 MemCopyUint8Function stub) {
@@ -1090,94 +1037,6 @@ void StringCharLoadGenerator::Generate(MacroAssembler* masm,
   __ bind(&done);
 }
 
-
-static MemOperand ExpConstant(int index, Register base) {
-  return MemOperand(base, index * kDoubleSize);
-}
-
-
-void MathExpGenerator::EmitMathExp(MacroAssembler* masm,
-                                   DoubleRegister input,
-                                   DoubleRegister result,
-                                   DoubleRegister double_scratch1,
-                                   DoubleRegister double_scratch2,
-                                   Register temp1,
-                                   Register temp2,
-                                   Register temp3) {
-  DCHECK(!input.is(result));
-  DCHECK(!input.is(double_scratch1));
-  DCHECK(!input.is(double_scratch2));
-  DCHECK(!result.is(double_scratch1));
-  DCHECK(!result.is(double_scratch2));
-  DCHECK(!double_scratch1.is(double_scratch2));
-  DCHECK(!temp1.is(temp2));
-  DCHECK(!temp1.is(temp3));
-  DCHECK(!temp2.is(temp3));
-  DCHECK(ExternalReference::math_exp_constants(0).address() != NULL);
-  DCHECK(!masm->serializer_enabled());  // External references not serializable.
-
-  Label zero, infinity, done;
-  __ li(temp3, Operand(ExternalReference::math_exp_constants(0)));
-
-  __ ldc1(double_scratch1, ExpConstant(0, temp3));
-  __ BranchF(&zero, NULL, ge, double_scratch1, input);
-
-  __ ldc1(double_scratch2, ExpConstant(1, temp3));
-  __ BranchF(&infinity, NULL, ge, input, double_scratch2);
-
-  __ ldc1(double_scratch1, ExpConstant(3, temp3));
-  __ ldc1(result, ExpConstant(4, temp3));
-  __ mul_d(double_scratch1, double_scratch1, input);
-  __ add_d(double_scratch1, double_scratch1, result);
-  __ FmoveLow(temp2, double_scratch1);
-  __ sub_d(double_scratch1, double_scratch1, result);
-  __ ldc1(result, ExpConstant(6, temp3));
-  __ ldc1(double_scratch2, ExpConstant(5, temp3));
-  __ mul_d(double_scratch1, double_scratch1, double_scratch2);
-  __ sub_d(double_scratch1, double_scratch1, input);
-  __ sub_d(result, result, double_scratch1);
-  __ mul_d(double_scratch2, double_scratch1, double_scratch1);
-  __ mul_d(result, result, double_scratch2);
-  __ ldc1(double_scratch2, ExpConstant(7, temp3));
-  __ mul_d(result, result, double_scratch2);
-  __ sub_d(result, result, double_scratch1);
-  // Mov 1 in double_scratch2 as math_exp_constants_array[8] == 1.
-  DCHECK(*reinterpret_cast<double*>
-         (ExternalReference::math_exp_constants(8).address()) == 1);
-  __ Move(double_scratch2, 1.);
-  __ add_d(result, result, double_scratch2);
-  __ dsrl(temp1, temp2, 11);
-  __ Ext(temp2, temp2, 0, 11);
-  __ Daddu(temp1, temp1, Operand(0x3ff));
-
-  // Must not call ExpConstant() after overwriting temp3!
-  __ li(temp3, Operand(ExternalReference::math_exp_log_table()));
-  __ Dlsa(temp3, temp3, temp2, 3);
-  __ lwu(temp2, MemOperand(temp3, Register::kMantissaOffset));
-  __ lwu(temp3, MemOperand(temp3, Register::kExponentOffset));
-  // The first word is loaded is the lower number register.
-  if (temp2.code() < temp3.code()) {
-    __ dsll(at, temp1, 20);
-    __ Or(temp1, temp3, at);
-    __ Move(double_scratch1, temp2, temp1);
-  } else {
-    __ dsll(at, temp1, 20);
-    __ Or(temp1, temp2, at);
-    __ Move(double_scratch1, temp3, temp1);
-  }
-  __ mul_d(result, result, double_scratch1);
-  __ BranchShort(&done);
-
-  __ bind(&zero);
-  __ Move(result, kDoubleRegZero);
-  __ BranchShort(&done);
-
-  __ bind(&infinity);
-  __ ldc1(result, ExpConstant(2, temp3));
-
-  __ bind(&done);
-}
-
 #ifdef DEBUG
 // nop(CODE_AGE_MARKER_NOP)
 static const uint32_t kCodeAgePatchFirstInstruction = 0x00010180;