Port r7868 (constant masking) to x64.

BUG=v8:1374
TEST=test-compiler/SplitConstantsInFullCompiler

Review URL: https://chromiumcodereview.appspot.com/10662045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/full-codegen-ia32.cc

@@ -227,7 +227,7 @@ void FullCodeGenerator::Generate() {
     __ lea(edx,
            Operand(ebp, StandardFrameConstants::kCallerSPOffset + offset));
     __ push(edx);
-    __ SafePush(Immediate(Smi::FromInt(num_parameters)));
+    __ push(Immediate(Smi::FromInt(num_parameters)));
     // Arguments to ArgumentsAccessStub:
     //   function, receiver address, parameter count.
     // The stub will rewrite receiver and parameter count if the previous
@@ -2491,7 +2491,7 @@ void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   SetSourcePosition(expr->position());
 
   // Load function and argument count into edi and eax.
-  __ SafeSet(eax, Immediate(arg_count));
+  __ Set(eax, Immediate(arg_count));
   __ mov(edi, Operand(esp, arg_count * kPointerSize));
 
   // Record call targets in unoptimized code, but not in the snapshot.
@@ -2849,7 +2849,7 @@ void FullCodeGenerator::EmitArguments(CallRuntime* expr) {
   // parameter count in eax.
   VisitForAccumulatorValue(args->at(0));
   __ mov(edx, eax);
-  __ SafeSet(eax, Immediate(Smi::FromInt(info_->scope()->num_parameters())));
+  __ Set(eax, Immediate(Smi::FromInt(info_->scope()->num_parameters())));
   ArgumentsAccessStub stub(ArgumentsAccessStub::READ_ELEMENT);
   __ CallStub(&stub);
   context()->Plug(eax);
@@ -2861,7 +2861,7 @@ void FullCodeGenerator::EmitArgumentsLength(CallRuntime* expr) {
 
   Label exit;
   // Get the number of formal parameters.
-  __ SafeSet(eax, Immediate(Smi::FromInt(info_->scope()->num_parameters())));
+  __ Set(eax, Immediate(Smi::FromInt(info_->scope()->num_parameters())));
 
   // Check if the calling frame is an arguments adaptor frame.
   __ mov(ebx, Operand(ebp, StandardFrameConstants::kCallerFPOffset));

src/x64/full-codegen-x64.cc

@@ -504,12 +504,20 @@ void FullCodeGenerator::EffectContext::Plug(Handle<Object> lit) const {
 
 void FullCodeGenerator::AccumulatorValueContext::Plug(
     Handle<Object> lit) const {
+  if (lit->IsSmi()) {
+    __ SafeMove(result_register(), Smi::cast(*lit));
+  } else {
     __ Move(result_register(), lit);
+  }
 }
 
 
 void FullCodeGenerator::StackValueContext::Plug(Handle<Object> lit) const {
+  if (lit->IsSmi()) {
+    __ SafePush(Smi::cast(*lit));
+  } else {
     __ Push(lit);
+  }
 }
 
 

src/x64/macro-assembler-x64.cc

@@ -892,6 +892,38 @@ void MacroAssembler::Set(const Operand& dst, int64_t x) {
   }
 }
 
+
+bool MacroAssembler::IsUnsafeInt(const int x) {
+  static const int kMaxBits = 17;
+  return !is_intn(x, kMaxBits);
+}
+
+
+void MacroAssembler::SafeMove(Register dst, Smi* src) {
+  ASSERT(!dst.is(kScratchRegister));
+  ASSERT(kSmiValueSize == 32);  // JIT cookie can be converted to Smi.
+  if (IsUnsafeInt(src->value()) && jit_cookie() != 0) {
+    Move(dst, Smi::FromInt(src->value() ^ jit_cookie()));
+    Move(kScratchRegister, Smi::FromInt(jit_cookie()));
+    xor_(dst, kScratchRegister);
+  } else {
+    Move(dst, src);
+  }
+}
+
+
+void MacroAssembler::SafePush(Smi* src) {
+  ASSERT(kSmiValueSize == 32);  // JIT cookie can be converted to Smi.
+  if (IsUnsafeInt(src->value()) && jit_cookie() != 0) {
+    Push(Smi::FromInt(src->value() ^ jit_cookie()));
+    Move(kScratchRegister, Smi::FromInt(jit_cookie()));
+    xor_(Operand(rsp, 0), kScratchRegister);
+  } else {
+    Push(src);
+  }
+}
+
+
 // ----------------------------------------------------------------------------
 // Smi tagging, untagging and tag detection.
 

src/x64/macro-assembler-x64.h

@@ -774,6 +774,11 @@ class MacroAssembler: public Assembler {
   // Move if the registers are not identical.
   void Move(Register target, Register source);
 
+  // Support for constant splitting.
+  bool IsUnsafeInt(const int x);
+  void SafeMove(Register dst, Smi* src);
+  void SafePush(Smi* src);
+
   // Bit-field support.
   void TestBit(const Operand& dst, int bit_index);
 

test/cctest/test-compiler.cc

@@ -406,15 +406,16 @@ static void CheckCodeForUnsafeLiteral(Handle<JSFunction> f) {
     Address end = pc + decode_size;
 
     v8::internal::EmbeddedVector<char, 128> decode_buffer;
+    v8::internal::EmbeddedVector<char, 128> smi_hex_buffer;
+    Smi* smi = Smi::FromInt(12345678);
+    OS::SNPrintF(smi_hex_buffer, "0x%lx", reinterpret_cast<intptr_t>(smi));
     while (pc < end) {
       int num_const = d.ConstantPoolSizeAt(pc);
       if (num_const >= 0) {
         pc += (num_const + 1) * kPointerSize;
       } else {
         pc += d.InstructionDecode(decode_buffer, pc);
-        CHECK(strstr(decode_buffer.start(), "mov eax,0x178c29c") == NULL);
-        CHECK(strstr(decode_buffer.start(), "push 0x178c29c") == NULL);
-        CHECK(strstr(decode_buffer.start(), "0x178c29c") == NULL);
+        CHECK(strstr(decode_buffer.start(), smi_hex_buffer.start()) == NULL);
       }
     }
   }