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nir: allow to fine tune unrolling for loops with soft fp64 ops

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Lowered fp64 ops can blow up the loop bodies while still being
suitable for unrolling.
Allow for using different parameters to unroll loops with
soft fp64.

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18863>
This commit is contained in:
SoroushIMG
2022-09-29 15:04:21 +01:00
committed by Marge Bot
parent 121f30005f
commit 1e8e785a07
3 changed files with 7 additions and 1 deletions
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3
src/compiler/nir/nir_opt_loop_unroll.c
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@@ -875,6 +875,9 @@ check_unrolling_restrictions(nir_shader *shader, nir_loop *loop)
/* Unroll much more aggressively if it can hide load latency. */
if (shader->options->max_unroll_iterations_aggressive && can_pipeline_loads(loop))
max_iter = shader->options->max_unroll_iterations_aggressive;
/* Tune differently if the loop has double ops and soft fp64 is in use */
else if (shader->options->max_unroll_iterations_fp64 && loop->info->has_soft_fp64)
max_iter = shader->options->max_unroll_iterations_fp64;
unsigned trip_count =
li->max_trip_count ? li->max_trip_count : li->guessed_trip_count;