src/v8/src/x64/codegen-x64.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.

#if V8_TARGET_ARCH_X64

#include "src/codegen.h"
#include "src/macro-assembler.h"
#include "src/x64/assembler-x64-inl.h"

namespace v8 {
namespace internal {

#define __ masm.

UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
  size_t allocated = 0;
  byte* buffer = AllocatePage(isolate->heap()->GetRandomMmapAddr(), &allocated);
  if (buffer == nullptr) return nullptr;

  MacroAssembler masm(isolate, buffer, static_cast<int>(allocated),
                      CodeObjectRequired::kNo);

  // xmm0: raw double input.
  // Move double input into registers.
  __ Sqrtsd(xmm0, xmm0);
  __ Ret();

  CodeDesc desc;
  masm.GetCode(isolate, &desc);
  DCHECK(!RelocInfo::RequiresRelocation(isolate, desc));

  Assembler::FlushICache(isolate, buffer, allocated);
  CHECK(SetPermissions(buffer, allocated, PageAllocator::kReadExecute));
  return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
}

#undef __

}  // namespace internal
}  // namespace v8

#endif  // V8_TARGET_ARCH_X64