[simd.js] Add SIMD load functions for Phase 1.

src/runtime/runtime-simd.cc

Index: src/runtime/runtime-simd.cc
diff --git a/src/runtime/runtime-simd.cc b/src/runtime/runtime-simd.cc
index ce9512e8da4b14c73469a879861efc2ca650ce46..83acabe21f080cd542ea74400f7cbeb0b6d4d721 100644
--- a/src/runtime/runtime-simd.cc
+++ b/src/runtime/runtime-simd.cc
@@ -588,6 +588,7 @@ SIMD_SMALL_INT_TYPES(SIMD_SUB_SATURATE_FUNCTION)
     return *result;                                           \
   }
 
+
 SIMD_NUMERIC_TYPES(SIMD_NEG_FUNCTION)
 SIMD_NUMERIC_TYPES(SIMD_ADD_FUNCTION)
 SIMD_NUMERIC_TYPES(SIMD_SUB_FUNCTION)
@@ -817,5 +818,76 @@ RUNTIME_FUNCTION(Runtime_Int8x16UnsignedExtractLane) {
   CONVERT_SIMD_LANE_ARG_CHECKED(lane, 1, 16);
   return *isolate->factory()->NewNumber(bit_cast<uint8_t>(a->get_lane(lane)));
 }
+
+
+//-------------------------------------------------------------------
+
+// Load functions.
+#define SIMD_MEMORY_OP_TYPES(FUNCTION) \
+  FUNCTION(Float32x4, float, 4)        \
+  FUNCTION(Int32x4, int32_t, 4)
+
+
+// Common Load Functions
+#define SIMD_LOAD(type, lane_type, lane_count, count, result)          \
+  static const int kLaneCount = lane_count;                            \
+  lane_type lanes[kLaneCount] = {0};                                   \
+  Handle<type> result;                                                 \
+  DCHECK(args.length() == 2);                                          \
+  CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, tarray_obj, 0);             \
+  CONVERT_INT32_ARG_CHECKED(index, 1)                                  \
+  RUNTIME_ASSERT(index >= 0);                                          \

[bbudge, 2015/08/20 23:05:25]

Combine this with the one below, i.e. index >= 0 && ...

[gdeepti, 2015/08/21 21:07:50]

Done.

+  Handle<JSTypedArray> tarray(JSTypedArray::cast(*tarray_obj));        \
+  size_t bpe = tarray->element_size();                                 \
+  uint32_t bytes = count * sizeof(lane_type);                          \
+  size_t byte_length = NumberToSize(isolate, tarray->byte_length());   \
+  RUNTIME_ASSERT(index* bpe + bytes <= byte_length);                   \

[bbudge, 2015/08/20 23:05:26]

nit: space after 'index'

[gdeepti, 2015/08/21 21:07:50]

Done.

+  size_t tarray_offset = NumberToSize(isolate, tarray->byte_offset()); \
+  uint8_t* tarray_base =                                               \
+      static_cast<uint8_t*>(tarray->GetBuffer()->backing_store()) +    \
+      tarray_offset;                                                   \
+  memcpy(lanes, tarray_base + (index)*bpe, bytes);                     \
+  result = isolate->factory()->New##type(lanes);
+
+
+#define SIMD_LOAD_FUNCTION(type, lane_type, lane_count)         \
+  RUNTIME_FUNCTION(Runtime_##type##Load) {                      \
+    HandleScope scope(isolate);                                 \
+    SIMD_LOAD(type, lane_type, lane_count, lane_count, result); \
+    return *result;                                             \
+  }
+
+
+#define SIMD_LOAD1_FUNCTION(type, lane_type, lane_count) \
+  RUNTIME_FUNCTION(Runtime_##type##Load1) {              \
+    HandleScope scope(isolate);                          \
+    SIMD_LOAD(type, lane_type, lane_count, 1, result);   \
+    return *result;                                      \
+  }
+
+
+#define SIMD_LOAD2_FUNCTION(type, lane_type, lane_count) \
+  RUNTIME_FUNCTION(Runtime_##type##Load2) {              \
+    HandleScope scope(isolate);                          \
+    SIMD_LOAD(type, lane_type, lane_count, 2, result);   \
+    return *result;                                      \
+  }
+
+
+#define SIMD_LOAD3_FUNCTION(type, lane_type, lane_count) \
+  RUNTIME_FUNCTION(Runtime_##type##Load3) {              \
+    HandleScope scope(isolate);                          \
+    SIMD_LOAD(type, lane_type, lane_count, 3, result);   \
+    return *result;                                      \
+  }
+
+
+SIMD_NUMERIC_TYPES(SIMD_LOAD_FUNCTION)
+SIMD_MEMORY_OP_TYPES(SIMD_LOAD1_FUNCTION)
+SIMD_MEMORY_OP_TYPES(SIMD_LOAD2_FUNCTION)
+SIMD_MEMORY_OP_TYPES(SIMD_LOAD3_FUNCTION)
+
+//-------------------------------------------------------------------
+
 }  // namespace internal
 }  // namespace v8