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nir/lower_phis_to_scalar: Add "lower_all" option

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We don't want to have to deal with vector phis in freedreno, because
vectors are always split/unsplit around vectorized instructions anyways,
and the stated reason for not scalarising them (it hurting coalescing)
won't apply to us because we won't be using nir_from_ssa. Add this
option so that we don't have to do the equivalent thing while
translating from NIR.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10809>
This commit is contained in:
Connor Abbott
2021-02-23 11:31:41 +01:00
committed by Marge Bot
parent 7e6a7dba1e
commit a40714abf7
15 changed files with 29 additions and 23 deletions
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src/gallium/drivers/vc4/vc4_program.c
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@@ -1521,7 +1521,7 @@ vc4_optimize_nir(struct nir_shader *s)
NIR_PASS_V(s, nir_lower_vars_to_ssa);
NIR_PASS(progress, s, nir_lower_alu_to_scalar, NULL, NULL);
NIR_PASS(progress, s, nir_lower_phis_to_scalar);
NIR_PASS(progress, s, nir_lower_phis_to_scalar, false);
NIR_PASS(progress, s, nir_copy_prop);
NIR_PASS(progress, s, nir_opt_remove_phis);
NIR_PASS(progress, s, nir_opt_dce);