Function to load consecutive values from an array about ecmascript_simd HOT 5 CLOSED

This can be accomplished with a Float32x4Array overlay, for example:

  var f32Array   = new Float32Array(100);
  var f32x4Array = new Float32x4Array(f32Array.buffer)
  var f32x4      = f32x4Array.getAt(1)

the .getAt(1) will load 4 float32 values into f32x4 from f32Array starting at index 4.

If a second parameter is given to the Float32x4Array constructor it indicates the byte offset into the data buffer. Right now, it must be a multiple of 16, so it's not possible to get to elements that doesn't start at a multiple of 4 index. Is that really needed, you think?

from ecmascript_simd.

It seems that DataView(buffer, byteOffset, byteLength) could accomplish what you want. Currently we have not implemented DataView API for float32x4 and int32x4.

from ecmascript_simd.

Peter and Haitao are correct. The expectation is that the specification will include new typed array views for each SIMD-128 type. For example, Float32x4Array and Int32x4Array. These arrays will have the same alignment (natural byte alignment) restrictions that existing typed arrays have. To complement the arrays and fully extend the Typed Array specification, the DataView class is extended with a getter and a setter for each SIMD-128 type. For example:

float32x4 getFloat32x4(unsigned long byteOffset, optional boolean littleEndian);
void setFloat32x4(unsigned long byteOffset, float32x4 value, optional boolean littleEndian);

Setters and getters on DataView have no alignment restrictions for byteOffsets.

from ecmascript_simd.

https://www.khronos.org/registry/typedarray/specs/latest/

from ecmascript_simd.

We now have load and store which perform this task.

from ecmascript_simd.