SIMD plumbing

runtime/vm/deopt_instructions.h

Index: runtime/vm/deopt_instructions.h
diff --git a/runtime/vm/deopt_instructions.h b/runtime/vm/deopt_instructions.h
index 134d33db8d2e830bf1850e2f9e42469990be822c..21d4ef4aef4e235638b2d44edf163d379a9285f0 100644
--- a/runtime/vm/deopt_instructions.h
+++ b/runtime/vm/deopt_instructions.h
@@ -53,11 +53,16 @@ class DeoptimizationContext : public ValueObject {
   }
 
   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_; }
@@ -73,7 +78,7 @@ class DeoptimizationContext : public ValueObject {
   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_;
@@ -96,9 +101,13 @@ class DeoptInstr : public ZoneAllocated {
     kRegister,
     kFpuRegister,
     kInt64FpuRegister,
+    kFloat32x4FpuRegister,
+    kUint32x4FpuRegister,
     kStackSlot,
     kDoubleStackSlot,
     kInt64StackSlot,
+    kFloat32x4StackSlot,
+    kUint32x4StackSlot,
     kPcMarker,
     kCallerFp,
     kCallerPc,