PPC/s390: [builtins] Introduce proper Float64Exp operator.

src/ppc/codegen-ppc.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/ppc/codegen-ppc.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/macro-assembler.h"
 #include "src/ppc/simulator-ppc.h"
 
 namespace v8 {
 namespace internal {
 
 
 #define __ masm.
 
-
-#if defined(USE_SIMULATOR)
-byte* fast_exp_ppc_machine_code = nullptr;
-double fast_exp_simulator(double x, Isolate* isolate) {
-  return Simulator::current(isolate)
-      ->CallFPReturnsDouble(fast_exp_ppc_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 = d1;
-    DoubleRegister result = d2;
-    DoubleRegister double_scratch1 = d3;
-    DoubleRegister double_scratch2 = d4;
-    Register temp1 = r7;
-    Register temp2 = r8;
-    Register temp3 = r9;
-
-// Called from C
-    __ function_descriptor();
-
-    __ Push(temp3, temp2, temp1);
-    MathExpGenerator::EmitMathExp(&masm, input, result, double_scratch1,
-                                  double_scratch2, temp1, temp2, temp3);
-    __ Pop(temp3, temp2, temp1);
-    __ fmr(d1, result);
-    __ Ret();
-  }
-
-  CodeDesc desc;
-  masm.GetCode(&desc);
-  DCHECK(ABI_USES_FUNCTION_DESCRIPTORS || !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_ppc_machine_code = buffer;
-  return &fast_exp_simulator;
-#endif
-}
-
-
 UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
 #if defined(USE_SIMULATOR)
   return nullptr;
 #else
   size_t actual_size;
   byte* buffer =
       static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
   if (buffer == nullptr) return nullptr;
 
   MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
@@ skipping 421 matching lines @@
   // Two-byte string.
   __ ShiftLeftImm(result, index, Operand(1));
   __ lhzx(result, MemOperand(string, result));
   __ b(&done);
   __ bind(&one_byte);
   // One-byte string.
   __ lbzx(result, MemOperand(string, index));
   __ 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;
-
-  __ mov(temp3, Operand(ExternalReference::math_exp_constants(0)));
-
-  __ lfd(double_scratch1, ExpConstant(0, temp3));
-  __ fcmpu(double_scratch1, input);
-  __ fmr(result, input);
-  __ bunordered(&done);
-  __ bge(&zero);
-
-  __ lfd(double_scratch2, ExpConstant(1, temp3));
-  __ fcmpu(input, double_scratch2);
-  __ bge(&infinity);
-
-  __ lfd(double_scratch1, ExpConstant(3, temp3));
-  __ lfd(result, ExpConstant(4, temp3));
-  __ fmul(double_scratch1, double_scratch1, input);
-  __ fadd(double_scratch1, double_scratch1, result);
-  __ MovDoubleLowToInt(temp2, double_scratch1);
-  __ fsub(double_scratch1, double_scratch1, result);
-  __ lfd(result, ExpConstant(6, temp3));
-  __ lfd(double_scratch2, ExpConstant(5, temp3));
-  __ fmul(double_scratch1, double_scratch1, double_scratch2);
-  __ fsub(double_scratch1, double_scratch1, input);
-  __ fsub(result, result, double_scratch1);
-  __ fmul(double_scratch2, double_scratch1, double_scratch1);
-  __ fmul(result, result, double_scratch2);
-  __ lfd(double_scratch2, ExpConstant(7, temp3));
-  __ fmul(result, result, double_scratch2);
-  __ fsub(result, result, double_scratch1);
-  __ lfd(double_scratch2, ExpConstant(8, temp3));
-  __ fadd(result, result, double_scratch2);
-  __ srwi(temp1, temp2, Operand(11));
-  __ andi(temp2, temp2, Operand(0x7ff));
-  __ addi(temp1, temp1, Operand(0x3ff));
-
-  // Must not call ExpConstant() after overwriting temp3!
-  __ mov(temp3, Operand(ExternalReference::math_exp_log_table()));
-  __ slwi(temp2, temp2, Operand(3));
-#if V8_TARGET_ARCH_PPC64
-  __ ldx(temp2, MemOperand(temp3, temp2));
-  __ sldi(temp1, temp1, Operand(52));
-  __ orx(temp2, temp1, temp2);
-  __ MovInt64ToDouble(double_scratch1, temp2);
-#else
-  __ add(ip, temp3, temp2);
-  __ lwz(temp3, MemOperand(ip, Register::kExponentOffset));
-  __ lwz(temp2, MemOperand(ip, Register::kMantissaOffset));
-  __ slwi(temp1, temp1, Operand(20));
-  __ orx(temp3, temp1, temp3);
-  __ MovInt64ToDouble(double_scratch1, temp3, temp2);
-#endif
-
-  __ fmul(result, result, double_scratch1);
-  __ b(&done);
-
-  __ bind(&zero);
-  __ fmr(result, kDoubleRegZero);
-  __ b(&done);
-
-  __ bind(&infinity);
-  __ lfd(result, ExpConstant(2, temp3));
-
-  __ bind(&done);
-}
-
 #undef __
 
 CodeAgingHelper::CodeAgingHelper(Isolate* isolate) {
   USE(isolate);
   DCHECK(young_sequence_.length() == kNoCodeAgeSequenceLength);
   // Since patcher is a large object, allocate it dynamically when needed,
   // to avoid overloading the stack in stress conditions.
   // DONT_FLUSH is used because the CodeAgingHelper is initialized early in
   // the process, before ARM simulator ICache is setup.
   base::SmartPointer<CodePatcher> patcher(
@@ skipping 57 matching lines @@
     patcher.masm()->Jump(r3);
     for (int i = 0; i < kCodeAgingSequenceNops; i++) {
       patcher.masm()->nop();
     }
   }
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC