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authorJose Maria Casanova Crespo <[email protected]>2018-06-09 11:45:22 +0200
committerJose Maria Casanova Crespo <[email protected]>2018-06-16 22:39:08 +0200
commit22c654941b576785d2e009bf64aa20fea758de58 (patch)
treead8c77b7b8b5c3eef5e06e60ec8e3acb8495751e /src/amd
parenta5665056e55fbdc9fc493fcaa9787406561fb4b1 (diff)
intel/fs: New shuffle_for_32bit_write and shuffle_from_32bit_read
These new shuffle functions deal with the shuffle/unshuffle operations needed for read/write operations using 32-bit components when the read/written components have a different bit-size (8, 16, 64-bits). Shuffle from 32-bit to 32-bit becomes a simple MOV. shuffle_src_to_dst takes care of doing a shuffle when source type is smaller than destination type and an unshuffle when source type is bigger than destination. So this new read/write functions just need to call shuffle_src_to_dst assuming that writes use a 32-bit destination and reads use a 32-bit source. As shuffle_for_32bit_write/from_32bit_read components take components in unit of source/destination types and shuffle_src_to_dst takes units of the smallest type component, we adjust components and first_component parameters. To enable this new functions it is needed than there is no source/destination overlap in the case of shuffle_from_32bit_read. That never happens on shuffle_for_32bit_write as it allocates a new destination register as it was at shuffle_64bit_data_for_32bit_write. v2: Reword commit log and add comments to explain why first_component and components parameters are adjusted. (Jason Ekstrand) Reviewed-by: Jason Ekstrand <[email protected]>
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