Support conversion of clamped double values for pixel arrays in Crankshaft.

src/arm/lithium-codegen-arm.cc

 // Copyright 2011 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
@@ skipping 3996 matching lines @@
   Register scratch = scratch0();
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
   __ ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
   __ cmp(scratch, Operand(instr->hydrogen()->map()));
   DeoptimizeIf(ne, instr->environment());
 }
 
 
+void LCodeGen::DoClampDoubleToUint8(LClampDoubleToUint8* instr) {
+  DoubleRegister value_reg = ToDoubleRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  DoubleRegister temp_reg = ToDoubleRegister(instr->TempAt(0));
+  __ ClampDoubleToUint8(result_reg, value_reg, temp_reg);
+}
+
+
+void LCodeGen::DoClampIToUint8(LClampIToUint8* instr) {
+  Register unclamped_reg = ToRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  __ ClampUint8(result_reg, unclamped_reg);
+}
+
+
+void LCodeGen::DoClampTaggedToUint8(LClampTaggedToUint8* instr) {
+  Register scratch = scratch0();
+  Register input_reg = ToRegister(instr->unclamped());
+  Register result_reg = ToRegister(instr->result());
+  DoubleRegister temp_reg = ToDoubleRegister(instr->TempAt(0));
+  Label is_smi, done, heap_number;
+
+  // Both smi and heap number cases are handled.
+  __ JumpIfSmi(input_reg, &is_smi);
+
+  // Check for heap number
+  __ ldr(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
+  __ cmp(scratch, Operand(factory()->heap_number_map()));
+  __ b(eq, &heap_number);
+
+  // Check for undefined. Undefined is converted to zero for clamping
+  // conversions.
+  __ cmp(input_reg, Operand(factory()->undefined_value()));
+  DeoptimizeIf(ne, instr->environment());
+  __ movt(input_reg, 0);
+  __ b(al, &done);
+
+  // Heap number
+  __ bind(&heap_number);
+  __ sub(scratch0(), input_reg, Operand(kHeapObjectTag));
+  __ vldr(double_scratch0(), scratch0(), HeapNumber::kValueOffset);
+  __ ClampDoubleToUint8(result_reg, double_scratch0(), temp_reg);
+  __ b(al, &done);
+
+  // smi
+  __ bind(&is_smi);
+  __ SmiUntag(result_reg, input_reg);
+  __ ClampUint8(result_reg, result_reg);
+
+  __ bind(&done);
+}
+
+
 void LCodeGen::LoadHeapObject(Register result,
                               Handle<HeapObject> object) {
   if (heap()->InNewSpace(*object)) {
     Handle<JSGlobalPropertyCell> cell =
         factory()->NewJSGlobalPropertyCell(object);
     __ mov(result, Operand(cell));
     __ ldr(result, FieldMemOperand(result, JSGlobalPropertyCell::kValueOffset));
   } else {
     __ mov(result, Operand(object));
   }
@@ skipping 389 matching lines @@
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 
 
 
 #undef __
 
 } }  // namespace v8::internal