[Mosaic TPU] Support packed type matmul with arbitrary shapes. #25068
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We only need to mask out subelement on contracting dim. Instead of unpacking data and applying masks, we create a VREG-sized i32 "mask" which contains subelement mask info to logical and with target vreg. Through this way, in order to mask sub-elements, each target vreg only needs to apply 1 op (logical_and) instead of 3 ops (unpacking + select + packing). PiperOrigin-RevId: 697806355
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[Mosaic TPU] Support packed type matmul with arbitrary shapes.
We only need to mask out subelement on contracting dim. Instead of unpacking data and applying masks, we create a VREG-sized i32 "mask" which contains subelement mask info to logical and with target vreg. Through this way, in order to mask sub-elements, each target vreg only needs to apply 1 op (logical_and) instead of 3 ops (unpacking + select + packing).