SIMD plumbing

runtime/vm/deopt_instructions.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DEOPT_INSTRUCTIONS_H_
 #define VM_DEOPT_INSTRUCTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
@@ skipping 35 matching lines @@
 
   RawObject* ObjectAt(intptr_t index) const {
     return object_table_.At(index);
   }
 
   intptr_t RegisterValue(Register reg) const {
     return registers_copy_[reg];
   }
 
   double FpuRegisterValue(FpuRegister reg) const {
-    return fpu_registers_copy_[reg];
+    return *reinterpret_cast<double*>(&fpu_registers_copy_[reg]);

[srdjan, 2013/03/19 20:48:45]

Is this machine specific (where the double is stored with the 128 bit word) or
at last little/big endian specific?

[Cutch, 2013/03/19 21:48:33]

This is machine specific where a FPU register is wider than a double.  On
platforms where the floating point register is the width of a double, there
should be no change. There could be an endian issue if the double is at the top
of a 128-bit register.

   }
 
   int64_t FpuRegisterValueAsInt64(FpuRegister reg) const {
-    return (reinterpret_cast<int64_t*>(fpu_registers_copy_))[reg];
+    return *reinterpret_cast<int64_t*>(&fpu_registers_copy_[reg]);
+  }
+
+  simd128_value_t FpuRegisterValueAsSimd128(FpuRegister reg) const {
+    const float* address = reinterpret_cast<float*>(&fpu_registers_copy_[reg]);
+    return simd128_value_t().readFrom(address);
   }
 
   Isolate* isolate() const { return isolate_; }
 
   intptr_t from_frame_size() const { return from_frame_size_; }
 
   DeoptReasonId deopt_reason() const { return deopt_reason_; }
 
  private:
   const Array& object_table_;
   intptr_t* to_frame_;
   const intptr_t to_frame_size_;
   intptr_t* from_frame_;
   intptr_t from_frame_size_;
   intptr_t* registers_copy_;
-  double* fpu_registers_copy_;
+  fpu_register_t* fpu_registers_copy_;
   const intptr_t num_args_;
   const DeoptReasonId deopt_reason_;
   intptr_t caller_fp_;
   Isolate* isolate_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptimizationContext);
 };
 
 
 
 // Represents one deopt instruction, e.g, setup return address, store object,
 // store register, etc. The target is defined by instruction's position in
 // the deopt-info array.
 class DeoptInstr : public ZoneAllocated {
  public:
   enum Kind {
     kRetAfterAddress,
     kRetBeforeAddress,
     kConstant,
     kRegister,
     kFpuRegister,
     kInt64FpuRegister,
+    kFloat32x4FpuRegister,
+    kUint32x4FpuRegister,
     kStackSlot,
     kDoubleStackSlot,
     kInt64StackSlot,
+    kFloat32x4StackSlot,
+    kUint32x4StackSlot,
     kPcMarker,
     kCallerFp,
     kCallerPc,
     kSuffix,
   };
 
   static DeoptInstr* Create(intptr_t kind_as_int, intptr_t from_index);
 
   DeoptInstr() {}
   virtual ~DeoptInstr() {}
@@ skipping 106 matching lines @@
                        DeoptInfo* info,
                        Smi* reason);
 
  private:
   static const intptr_t kEntrySize = 3;
 };
 
 }  // namespace dart
 
 #endif  // VM_DEOPT_INSTRUCTIONS_H_