void LCodeGen::DoRandom(LRandom* instr) {
+ class DeferredDoRandom: public LDeferredCode {
+ public:
+ DeferredDoRandom(LCodeGen* codegen, LRandom* instr)
+ : LDeferredCode(codegen), instr_(instr) { }
+ virtual void Generate() { codegen()->DoDeferredRandom(instr_); }
+ virtual LInstruction* instr() { return instr_; }
+ private:
+ LRandom* instr_;
+ };
+
+ DeferredDoRandom* deferred = new DeferredDoRandom(this, instr);
+
// Having marked this instruction as a call we can use any
// registers.
ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
ASSERT(ToRegister(instr->InputAt(0)).is(eax));
+ // Assert that the register size is indeed the size of each seed.
+ static const int kSeedSize = sizeof(uint32_t);
+ STATIC_ASSERT(kPointerSize == kSeedSize);
- __ PrepareCallCFunction(1, ebx);
__ mov(eax, FieldOperand(eax, GlobalObject::kGlobalContextOffset));
- __ mov(Operand(esp, 0), eax);
- __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+ static const int kRandomSeedOffset =
+ FixedArray::kHeaderSize + Context::RANDOM_SEED_INDEX * kPointerSize;
+ __ mov(ebx, FieldOperand(eax, kRandomSeedOffset));
+ // ebx: FixedArray of the global context's random seeds
+
+ // Load state[0].
+ __ mov(ecx, FieldOperand(ebx, ByteArray::kHeaderSize));
+ // If state[0] == 0, call runtime to initialize seeds.
+ __ test(ecx, ecx);
+ __ j(zero, deferred->entry());
+
+ // state[0] = 18273 * (state[0] & 0xFFFF) + (state[0] >> 16)
+ __ movzx_w(edx, ecx);
+ __ imul(edx, edx, 18273);
+ __ shr(ecx, 16);
+ __ add(ecx, edx);
+ __ mov(FieldOperand(ebx, ByteArray::kHeaderSize), ecx);
+
+ // Load state[1].
+ // state[1] = 36969 * (state[1] & 0xFFFF) + (state[1] >> 16);
+ __ mov(eax, FieldOperand(ebx, ByteArray::kHeaderSize + kSeedSize));
+ __ movzx_w(edx, eax);
+ __ imul(edx, edx, 36969);
+ __ shr(eax, 16);
+ __ add(eax, edx);
+ __ mov(FieldOperand(ebx, ByteArray::kHeaderSize + kSeedSize), eax);
+
+ // ecx: state[0]
+ // eax: state[1]
+ // Random bit pattern = (state[0] << 14) + (state[1] & 0x3FFFF)
+ __ shl(ecx, 14);
+ __ and_(eax, Immediate(0x3FFFF));
+ __ add(eax, ecx);
+ __ bind(deferred->exit());
// Convert 32 random bits in eax to 0.(32 random bits) in a double
// by computing:
// ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
}
+void LCodeGen::DoDeferredRandom(LRandom* instr) {
+ __ PrepareCallCFunction(1, ebx);
+ __ mov(Operand(esp, 0), eax);
+ __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+ // Return value is in eax.
+}
+
+
void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
ASSERT(instr->value()->Equals(instr->result()));
XMMRegister input_reg = ToDoubleRegister(instr->value());
--- /dev/null
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#include "v8.h"
+
+#include "cctest.h"
+#include "compiler.h"
+#include "execution.h"
+#include "isolate.h"
+
+
+using namespace v8::internal;
+
+static v8::Persistent<v8::Context> env;
+
+
+void SetSeeds(Handle<ByteArray> seeds, uint32_t state0, uint32_t state1) {
+ for (int i = 0; i < 4; i++) {
+ seeds->set(i, static_cast<byte>(state0 >> (i * kBitsPerByte)));
+ seeds->set(i + 4, static_cast<byte>(state1 >> (i * kBitsPerByte)));
+ }
+}
+
+
+void TestSeeds(Handle<JSFunction> fun,
+ Handle<Context> context,
+ uint32_t state0,
+ uint32_t state1) {
+ bool has_pending_exception;
+ Handle<JSObject> global(context->global());
+ Handle<ByteArray> seeds(context->random_seed());
+
+ SetSeeds(seeds, state0, state1);
+ Handle<Object> value =
+ Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+ CHECK(value->IsHeapNumber());
+ CHECK(fun->IsOptimized());
+ double crankshaft_value = HeapNumber::cast(*value)->value();
+
+ SetSeeds(seeds, state0, state1);
+ V8::FillHeapNumberWithRandom(*value, *context);
+ double runtime_value = HeapNumber::cast(*value)->value();
+ CHECK_EQ(runtime_value, crankshaft_value);
+}
+
+
+TEST(CrankshaftRandom) {
+ if (!FLAG_crankshaft) return;
+
+ if (env.IsEmpty()) env = v8::Context::New();
+ v8::HandleScope scope;
+ env->Enter();
+
+ Handle<Context> context(Isolate::Current()->context());
+ Handle<JSObject> global(context->global());
+ Handle<ByteArray> seeds(context->random_seed());
+ bool has_pending_exception;
+
+ CompileRun("function f() { return Math.random(); }");
+
+ Object* symbol = FACTORY->LookupAsciiSymbol("f")->ToObjectChecked();
+ MaybeObject* fun_object =
+ context->global()->GetProperty(String::cast(symbol));
+ Handle<JSFunction> fun(JSFunction::cast(fun_object->ToObjectChecked()));
+
+ // Optimize function.
+ Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+ Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+ fun->MarkForLazyRecompilation();
+
+ // Test with some random values.
+ TestSeeds(fun, context, 0xC0C0AFFE, 0x31415926);
+ TestSeeds(fun, context, 0x01020304, 0xFFFFFFFF);
+ TestSeeds(fun, context, 0x00000001, 0x00000000);
+
+ // Test that we bail out to runtime when seeds are uninitialized (zeros).
+ SetSeeds(seeds, 0, 0);
+ Handle<Object> value =
+ Execution::Call(fun, global, 0, NULL, &has_pending_exception);
+ CHECK(value->IsHeapNumber());
+ CHECK(fun->IsOptimized());
+ double crankshaft_value = HeapNumber::cast(*value)->value();
+ CHECK_NE(0.0, crankshaft_value);
+}
projects / platform / upstream / v8.git / commitdiff