Line data    Source code

       1             : // Copyright 2012 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #if V8_TARGET_ARCH_X64
       6             : 
       7             : #include "src/codegen.h"
       8             : #include "src/macro-assembler.h"
       9             : #include "src/x64/assembler-x64-inl.h"
      10             : 
      11             : namespace v8 {
      12             : namespace internal {
      13             : 
      14             : #define __ masm.
      15             : 
      16             : 
      17           0 : UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) {
      18             :   size_t actual_size;
      19             :   // Allocate buffer in executable space.
      20             :   byte* buffer = static_cast<byte*>(base::OS::Allocate(
      21           0 :       1 * KB, &actual_size, true, isolate->heap()->GetRandomMmapAddr()));
      22           0 :   if (buffer == nullptr) return nullptr;
      23             : 
      24             :   MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size),
      25           0 :                       CodeObjectRequired::kNo);
      26             :   // xmm0: raw double input.
      27             :   // Move double input into registers.
      28           0 :   __ Sqrtsd(xmm0, xmm0);
      29           0 :   __ Ret();
      30             : 
      31             :   CodeDesc desc;
      32           0 :   masm.GetCode(isolate, &desc);
      33             :   DCHECK(!RelocInfo::RequiresRelocation(isolate, desc));
      34             : 
      35           0 :   Assembler::FlushICache(isolate, buffer, actual_size);
      36           0 :   base::OS::SetReadAndExecutable(buffer, actual_size);
      37             :   return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer);
      38             : }
      39             : 
      40             : #undef __
      41             : 
      42             : }  // namespace internal
      43             : }  // namespace v8
      44             : 
      45             : #endif  // V8_TARGET_ARCH_X64