int OS::ActivationFrameAlignment() {
#ifdef _WIN64
return 16; // Windows 64-bit ABI requires the stack to be 16-byte aligned.
+#elif defined(__MINGW32__)
+ // With gcc 4.4 the tree vectorization optimizer can generate code
+ // that requires 16 byte alignment such as movdqa on x86.
+ return 16;
#else
return 8; // Floating-point math runs faster with 8-byte alignment.
#endif
}
+#ifdef __GNUC__
+#define ELEMENT_COUNT 4
+
+void DoSSE2(const v8::FunctionCallbackInfo<v8::Value>& args) {
+ Isolate* isolate = reinterpret_cast<Isolate*>(CcTest::isolate());
+ HandleScope scope(isolate);
+
+ CHECK(args[0]->IsArray());
+ v8::Local<v8::Array> vec = v8::Local<v8::Array>::Cast(args[0]);
+ CHECK_EQ(ELEMENT_COUNT, vec->Length());
+
+ v8::internal::byte buffer[256];
+ Assembler assm(isolate, buffer, sizeof buffer);
+
+ ASSERT(CpuFeatures::IsSupported(SSE2));
+ CpuFeatureScope fscope(&assm, SSE2);
+
+ // Remove return address from the stack for fix stack frame alignment.
+ __ pop(ecx);
+
+ // Store input vector on the stack.
+ for (int i = 0; i < ELEMENT_COUNT; ++i) {
+ __ push(Immediate(vec->Get(i)->Int32Value()));
+ }
+
+ // Read vector into a xmm register.
+ __ pxor(xmm0, xmm0);
+ __ movdqa(xmm0, Operand(esp, 0));
+ // Create mask and store it in the return register.
+ __ movmskps(eax, xmm0);
+
+ // Remove unused data from the stack.
+ __ add(esp, Immediate(ELEMENT_COUNT * sizeof(int32_t)));
+ // Restore return address.
+ __ push(ecx);
+
+ __ ret(0);
+
+ CodeDesc desc;
+ assm.GetCode(&desc);
+
+ Object* code = isolate->heap()->CreateCode(
+ desc,
+ Code::ComputeFlags(Code::STUB),
+ Handle<Code>())->ToObjectChecked();
+ CHECK(code->IsCode());
+
+ F0 f = FUNCTION_CAST<F0>(Code::cast(code)->entry());
+ int res = f();
+ args.GetReturnValue().Set(v8::Integer::New(res));
+}
+
+TEST(StackAlignmentForSSE2) {
+ CcTest::InitializeVM();
+ if (!CpuFeatures::IsSupported(SSE2)) return;
+
+ CHECK_EQ(0, OS::ActivationFrameAlignment() % 16);
+
+ v8::Isolate* isolate = v8::Isolate::GetCurrent();
+ v8::HandleScope handle_scope(isolate);
+ v8::Handle<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
+ global_template->Set(v8_str("do_sse2"), v8::FunctionTemplate::New(DoSSE2));
+
+ LocalContext env(NULL, global_template);
+ CompileRun(
+ "function foo(vec) {"
+ " return do_sse2(vec);"
+ "}");
+
+ v8::Local<v8::Object> global_object = env->Global();
+ v8::Local<v8::Function> foo =
+ v8::Local<v8::Function>::Cast(global_object->Get(v8_str("foo")));
+
+ int32_t vec[ELEMENT_COUNT] = { -1, 1, 1, 1 };
+ v8::Local<v8::Array> v8_vec = v8::Array::New(ELEMENT_COUNT);
+ for (int i = 0; i < ELEMENT_COUNT; i++) {
+ v8_vec->Set(i, v8_num(vec[i]));
+ }
+
+ v8::Local<v8::Value> args[] = { v8_vec };
+ v8::Local<v8::Value> result = foo->Call(global_object, 1, args);
+
+ // The mask should be 0b1000.
+ CHECK_EQ(8, result->Int32Value());
+}
+
+#undef ELEMENT_COUNT
+#endif // __GNUC__
#undef __
using v8::internal::rsi;
using v8::internal::rsp;
using v8::internal::times_1;
+using v8::internal::xmm0;
// Test the x64 assembler by compiling some simple functions into
// a buffer and executing them. These tests do not initialize the
}
+#ifdef __GNUC__
+#define ELEMENT_COUNT 4
+
+void DoSSE2(const v8::FunctionCallbackInfo<v8::Value>& args) {
+ CcTest::InitializeVM();
+ v8::HandleScope scope(CcTest::isolate());
+ v8::internal::byte buffer[1024];
+
+ CHECK(args[0]->IsArray());
+ v8::Local<v8::Array> vec = v8::Local<v8::Array>::Cast(args[0]);
+ CHECK_EQ(ELEMENT_COUNT, vec->Length());
+
+ Isolate* isolate = Isolate::Current();
+ Assembler assm(isolate, buffer, sizeof(buffer));
+
+ // Remove return address from the stack for fix stack frame alignment.
+ __ pop(rcx);
+
+ // Store input vector on the stack.
+ for (int i = 0; i < ELEMENT_COUNT; i++) {
+ __ movl(rax, Immediate(vec->Get(i)->Int32Value()));
+ __ shl(rax, Immediate(0x20));
+ __ or_(rax, Immediate(vec->Get(++i)->Int32Value()));
+ __ push(rax);
+ }
+
+ // Read vector into a xmm register.
+ __ xorps(xmm0, xmm0);
+ __ movdqa(xmm0, Operand(rsp, 0));
+ // Create mask and store it in the return register.
+ __ movmskps(rax, xmm0);
+
+ // Remove unused data from the stack.
+ __ addq(rsp, Immediate(ELEMENT_COUNT * sizeof(int32_t)));
+ // Restore return address.
+ __ push(rcx);
+
+ __ ret(0);
+
+ CodeDesc desc;
+ assm.GetCode(&desc);
+ Code* code = Code::cast(isolate->heap()->CreateCode(
+ desc,
+ Code::ComputeFlags(Code::STUB),
+ v8::internal::Handle<Code>())->ToObjectChecked());
+ CHECK(code->IsCode());
+
+ F0 f = FUNCTION_CAST<F0>(code->entry());
+ int res = f();
+ args.GetReturnValue().Set(v8::Integer::New(res));
+}
+
+TEST(StackAlignmentForSSE2) {
+ CHECK_EQ(0, OS::ActivationFrameAlignment() % 16);
+
+ v8::Isolate* isolate = v8::Isolate::GetCurrent();
+ v8::HandleScope handle_scope(isolate);
+ v8::Handle<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
+ global_template->Set(v8_str("do_sse2"), v8::FunctionTemplate::New(DoSSE2));
+
+ LocalContext env(NULL, global_template);
+ CompileRun(
+ "function foo(vec) {"
+ " return do_sse2(vec);"
+ "}");
+
+ v8::Local<v8::Object> global_object = env->Global();
+ v8::Local<v8::Function> foo =
+ v8::Local<v8::Function>::Cast(global_object->Get(v8_str("foo")));
+
+ int32_t vec[ELEMENT_COUNT] = { -1, 1, 1, 1 };
+ v8::Local<v8::Array> v8_vec = v8::Array::New(ELEMENT_COUNT);
+ for (int i = 0; i < ELEMENT_COUNT; i++) {
+ v8_vec->Set(i, v8_num(vec[i]));
+ }
+
+ v8::Local<v8::Value> args[] = { v8_vec };
+ v8::Local<v8::Value> result = foo->Call(global_object, 1, args);
+
+ // The mask should be 0b1000.
+ CHECK_EQ(8, result->Int32Value());
+}
+
+#undef ELEMENT_COUNT
+#endif // __GNUC__
#undef __
TEST(NumberOfCores) {
CHECK_GT(OS::NumberOfCores(), 0);
}
+
+
+#ifdef __GNUC__
+#define ASM __asm__ __volatile__
+
+#if defined(_M_X64) || defined(__x86_64__)
+#define GET_STACK_POINTER() \
+ static int sp_addr = 0; \
+ do { \
+ ASM("mov %%rsp, %0" : "=g" (sp_addr)); \
+ } while (0)
+#elif defined(_M_IX86) || defined(__i386__)
+#define GET_STACK_POINTER() \
+ static int sp_addr = 0; \
+ do { \
+ ASM("mov %%esp, %0" : "=g" (sp_addr)); \
+ } while (0)
+#elif defined(__ARMEL__)
+#define GET_STACK_POINTER() \
+ static int sp_addr = 0; \
+ do { \
+ ASM("str %%sp, %0" : "=g" (sp_addr)); \
+ } while (0)
+#elif defined(__MIPSEL__)
+#define GET_STACK_POINTER() \
+ static int sp_addr = 0; \
+ do { \
+ ASM("sw $sp, %0" : "=g" (sp_addr)); \
+ } while (0)
+#else
+#error Host architecture was not detected as supported by v8
+#endif
+
+void GetStackPointer(const v8::FunctionCallbackInfo<v8::Value>& args) {
+ GET_STACK_POINTER();
+ args.GetReturnValue().Set(v8_num(sp_addr));
+}
+
+TEST(StackAlignment) {
+ v8::Isolate* isolate = v8::Isolate::GetCurrent();
+ v8::HandleScope handle_scope(isolate);
+ v8::Handle<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
+ global_template->Set(v8_str("get_stack_pointer"),
+ v8::FunctionTemplate::New(GetStackPointer));
+
+ LocalContext env(NULL, global_template);
+ CompileRun(
+ "function foo() {"
+ " return get_stack_pointer();"
+ "}");
+
+ v8::Local<v8::Object> global_object = env->Global();
+ v8::Local<v8::Function> foo =
+ v8::Local<v8::Function>::Cast(global_object->Get(v8_str("foo")));
+
+ v8::Local<v8::Value> result = foo->Call(global_object, 0, NULL);
+ CHECK_EQ(0, result->Int32Value() % OS::ActivationFrameAlignment());
+}
+
+#undef GET_STACK_POINTERS
+#undef ASM
+#endif // __GNUC__
projects / platform / upstream / v8.git / commitdiff