Lazily initialize fast_sqrt() and pass an Isolate parameter to it

src/ia32/codegen-ia32.cc

 // Copyright 2012 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/ia32/codegen-ia32.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/codegen.h"
 #include "src/heap/heap.h"
@@ skipping 53 matching lines @@
   CodeDesc desc;
   masm.GetCode(&desc);
   DCHECK(!RelocInfo::RequiresRelocation(desc));
 
   Assembler::FlushICache(isolate, buffer, actual_size);
   base::OS::ProtectCode(buffer, actual_size);
   return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 }
 
 
-UnaryMathFunction CreateSqrtFunction() {
+UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
   size_t actual_size;
   // Allocate buffer in executable space.
   byte* buffer =
       static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true));
-  if (buffer == NULL) return &std::sqrt;
-  MacroAssembler masm(NULL, buffer, static_cast<int>(actual_size),
+  if (buffer == nullptr) return nullptr;
+  MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
                       CodeObjectRequired::kNo);
   // esp[1 * kPointerSize]: raw double input
   // esp[0 * kPointerSize]: return address
   // Move double input into registers.
   {
     __ movsd(xmm0, Operand(esp, 1 * kPointerSize));
     __ sqrtsd(xmm0, xmm0);
     __ movsd(Operand(esp, 1 * kPointerSize), xmm0);
     // Load result into floating point register as return value.
     __ fld_d(Operand(esp, 1 * kPointerSize));
     __ Ret();
   }
 
   CodeDesc desc;
   masm.GetCode(&desc);
   DCHECK(!RelocInfo::RequiresRelocation(desc));
 
-  Assembler::FlushICacheWithoutIsolate(buffer, actual_size);
+  Assembler::FlushICache(isolate, buffer, actual_size);
   base::OS::ProtectCode(buffer, actual_size);
-  return FUNCTION_CAST<UnaryMathFunction>(buffer);
+  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
 }
 
 
 // Helper functions for CreateMemMoveFunction.
 #undef __
 #define __ ACCESS_MASM(masm)
 
 enum Direction { FORWARD, BACKWARD };
 enum Alignment { MOVE_ALIGNED, MOVE_UNALIGNED };
 
@@ skipping 929 matching lines @@
     CodePatcher patcher(sequence, young_length);
     patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32);
   }
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32