Pavel Ondračka
d9449c5201
Right now we always write to a temp and than emit movs to both POS and WPOS. When the result is trivial, like: MOV temp[0], in[0] MOV output[0], temp[0] MOV output[1], temp[0] the dataflow analysis passes can take care of it, this is however one of the last optimizations we need the pass for. Additionally it fails even for some still trivial cases like: MAD temp[2], const[3], temp[0].wwww, temp[1]; MOV output[0], temp[2]; MOV output[2], temp[2]; This patch will just duplicate the output instuction when there is only a single output write. The long-term plan would be to just trust NIR, do as little in the backend as possible and optimize the remaining backend passes to not need any additional cleanups. total instructions in shared programs: 105862 -> 105427 (-0.41%) instructions in affected programs: 20527 -> 20092 (-2.12%) total temps in shared programs: 14029 -> 13991 (-0.27%) temps in affected programs: 152 -> 114 (-25.00%) Signed-off-by: Pavel Ondračka <pavel.ondracka@gmail.com> Reviewed-by: Filip Gawin <filip.gawin@zoho.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15321>
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