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nir: lower is/load_helper to zero if no helper lanes are needed

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If there are no helper invocations required during the
execution of the shader, we can assume that there also
are no helper invocations active.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9058>
This commit is contained in:
Daniel Schürmann 2021-02-15 16:13:39 +01:00 • committed by Marge Bot
parent b689a65316
commit 2e6c9e54f1
1 changed files with 8 additions and 1 deletions
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9
src/compiler/nir/nir_lower_discard_or_demote.c
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@ -62,8 +62,15 @@ nir_lower_demote_to_discard_instr(nir_builder *b, nir_instr *instr, void *data)
intrin->intrinsic = nir_intrinsic_discard_if;
return true;
case nir_intrinsic_is_helper_invocation:
intrin->intrinsic = nir_intrinsic_load_helper_invocation;
case nir_intrinsic_load_helper_invocation: {
/* If the shader doesn't need helper invocations,
* we can assume there are none */
b->cursor = nir_before_instr(instr);
nir_ssa_def *zero = nir_imm_false(b);
nir_ssa_def_rewrite_uses_ssa(&intrin->dest.ssa, zero);
nir_instr_remove_v(instr);
return true;
}
default:
return false;
}