MIPS: Unroll push loop in r19040 and other push optimizations.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/145973015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19042 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/builtins-mips.cc

@@ -585,8 +585,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // Receiver for constructor call allocated.
     // t4: JSObject
     __ bind(&allocated);
-    __ push(t4);
-    __ push(t4);
+    __ Push(t4, t4);
 
     // Reload the number of arguments from the stack.
     // sp[0]: receiver
@@ -1092,9 +1091,7 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     {
       FrameScope scope(masm, StackFrame::INTERNAL);
       __ sll(a0, a0, kSmiTagSize);  // Smi tagged.
-      __ push(a0);
-
-      __ push(a2);
+      __ Push(a0, a2);
       __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
       __ mov(a2, v0);
 
@@ -1244,9 +1241,8 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
 
     // Push current limit and index.
     __ bind(&okay);
-    __ push(v0);  // Limit.
-    __ mov(a1, zero_reg);  // Initial index.
-    __ push(a1);
+    __ mov(a1, zero_reg);
+    __ Push(v0, a1);  // Limit and initial index.
 
     // Get the receiver.
     __ lw(a0, MemOperand(fp, kRecvOffset));

src/mips/code-stubs-mips.cc

@@ -483,9 +483,12 @@ void HydrogenCodeStub::GenerateLightweightMiss(MacroAssembler* masm) {
     FrameScope scope(masm, StackFrame::INTERNAL);
     ASSERT(descriptor->register_param_count_ == 0 ||
            a0.is(descriptor->register_params_[param_count - 1]));
-    // Push arguments
+    // Push arguments, adjust sp.
+    __ Subu(sp, sp, Operand(param_count * kPointerSize));
     for (int i = 0; i < param_count; ++i) {
-      __ push(descriptor->register_params_[i]);
+      // Store argument to stack.
+      __ sw(descriptor->register_params_[i],
+            MemOperand(sp, (param_count-1-i) * kPointerSize));
     }
     ExternalReference miss = descriptor->miss_handler();
     __ CallExternalReference(miss, descriptor->register_param_count_);

src/mips/full-codegen-mips.cc

@@ -1159,10 +1159,9 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ lw(a2, FieldMemOperand(a2, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
   // Set up the four remaining stack slots.
-  __ push(v0);  // Map.
   __ li(a0, Operand(Smi::FromInt(0)));
-  // Push enumeration cache, enumeration cache length (as smi) and zero.
-  __ Push(a2, a1, a0);
+  // Push map, enumeration cache, enumeration cache length (as smi) and zero.
+  __ Push(v0, a2, a1, a0);
   __ jmp(&loop);
 
   __ bind(&no_descriptors);
@@ -1227,8 +1226,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   // Convert the entry to a string or (smi) 0 if it isn't a property
   // any more. If the property has been removed while iterating, we
   // just skip it.
-  __ push(a1);  // Enumerable.
-  __ push(a3);  // Current entry.
+  __ Push(a1, a3);  // Enumerable and current entry.
   __ InvokeBuiltin(Builtins::FILTER_KEY, CALL_FUNCTION);
   __ mov(a3, result_register());
   __ Branch(loop_statement.continue_label(), eq, a3, Operand(zero_reg));
@@ -2506,19 +2504,17 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
       // able to drill a hole to that function context, even from inside a
       // 'with' context.  We thus bypass the normal static scope lookup for
       // var->IsContextSlot().
-      __ push(v0);
       __ li(a0, Operand(var->name()));
-      __ Push(cp, a0);  // Context and name.
+      __ Push(v0, cp, a0);  // Context and name.
       __ CallRuntime(Runtime::kInitializeConstContextSlot, 3);
     }
 
   } else if (var->mode() == LET && op != Token::INIT_LET) {
     // Non-initializing assignment to let variable needs a write barrier.
     if (var->IsLookupSlot()) {
-      __ push(v0);  // Value.
       __ li(a1, Operand(var->name()));
       __ li(a0, Operand(Smi::FromInt(language_mode())));
-      __ Push(cp, a1, a0);  // Context, name, strict mode.
+      __ Push(v0, cp, a1, a0);  // Value, context, name, strict mode.
       __ CallRuntime(Runtime::kStoreContextSlot, 4);
     } else {
       ASSERT(var->IsStackAllocated() || var->IsContextSlot());
@@ -2563,10 +2559,9 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
       }
     } else {
       ASSERT(var->IsLookupSlot());
-      __ push(v0);  // Value.
       __ li(a1, Operand(var->name()));
       __ li(a0, Operand(Smi::FromInt(language_mode())));
-      __ Push(cp, a1, a0);  // Context, name, strict mode.
+      __ Push(v0, cp, a1, a0);  // Value, context, name, strict mode.
       __ CallRuntime(Runtime::kStoreContextSlot, 4);
     }
   }

src/mips/lithium-codegen-mips.cc

@@ -179,8 +179,7 @@ bool LCodeGen::GeneratePrologue() {
   if (slots > 0) {
     if (FLAG_debug_code) {
       __ Subu(sp,  sp, Operand(slots * kPointerSize));
-      __ push(a0);
-      __ push(a1);
+      __ Push(a0, a1);
       __ Addu(a0, sp, Operand(slots *  kPointerSize));
       __ li(a1, Operand(kSlotsZapValue));
       Label loop;
@@ -188,8 +187,7 @@ bool LCodeGen::GeneratePrologue() {
       __ Subu(a0, a0, Operand(kPointerSize));
       __ sw(a1, MemOperand(a0, 2 * kPointerSize));
       __ Branch(&loop, ne, a0, Operand(sp));
-      __ pop(a1);
-      __ pop(a0);
+      __ Pop(a0, a1);
     } else {
       __ Subu(sp, sp, Operand(slots * kPointerSize));
     }

src/mips/stub-cache-mips.cc

@@ -778,13 +778,15 @@ static void GenerateFastApiCall(MacroAssembler* masm,
                                 int argc,
                                 Register* values) {
   ASSERT(!receiver.is(scratch_in));
-  __ push(receiver);
+  // Preparing to push, adjust sp.
+  __ Subu(sp, sp, Operand((argc + 1) * kPointerSize));
+  __ sw(receiver, MemOperand(sp, argc * kPointerSize));  // Push receiver.
   // Write the arguments to stack frame.
   for (int i = 0; i < argc; i++) {
     Register arg = values[argc-1-i];
     ASSERT(!receiver.is(arg));
     ASSERT(!scratch_in.is(arg));
-    __ push(arg);
+    __ sw(arg, MemOperand(sp, (argc-1-i) * kPointerSize));  // Push arg.
   }
   ASSERT(optimization.is_simple_api_call());
 
@@ -1228,8 +1230,7 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
   // checks.
   ASSERT(holder->IsJSGlobalProxy() || !holder->IsAccessCheckNeeded());
 
-  __ push(receiver());  // Receiver.
-  __ push(holder_reg);
+  __ Push(receiver(), holder_reg);  // Receiver.
   __ li(at, Operand(callback));  // Callback info.
   __ push(at);
   __ li(at, Operand(name));
@@ -1284,8 +1285,7 @@ void StoreStubCompiler::GenerateStoreViaSetter(
 
     if (!setter.is_null()) {
       // Call the JavaScript setter with receiver and value on the stack.
-      __ push(a1);
-      __ push(a0);
+      __ Push(a1, a0);
       ParameterCount actual(1);
       ParameterCount expected(setter);
       __ InvokeFunction(setter, expected, actual,