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authorFrancisco Jerez <[email protected]>2016-05-27 16:03:34 -0700
committerFrancisco Jerez <[email protected]>2016-05-31 15:57:41 -0700
commit4fe4f6e8a776acc60633809693e4135f5c894aa3 (patch)
treeb7370ae732d799b975191edf2fdaff20a3a37270 /src/mesa/x86-64
parent1898673f586b9110fb2a3125e2781cbb1d795c73 (diff)
i965/fs: Fix compute_to_mrf() to coalesce VGRFs initialized by multiple single-GRF writes.
Which requires using a bitset instead of a boolean flag to keep track of the GRFs we've seen a generating instruction for already. The search loop continues until all instructions initializing the value of the source VGRF have been found, or it is determined that coalescing is not possible. Fixes a few piglit test cases on Gen4-6 which were regressed by 6956015aa514f2d06d0e4b33bfe6bca83142fbf0 due to the different (yet perfectly valid) ordering in which copy instructions are emitted now by the simd lowering pass, which had the side effect of causing this optimization pass to start corrupting the program in cases where a VGRF-to-MRF copy instruction would be eliminated but only the last instruction writing to the source VGRF region would be rewritten to point to the target MRF. Cc: "12.0" <[email protected]> Reviewed-by: Jason Ekstrand <[email protected]>
Diffstat (limited to 'src/mesa/x86-64')
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