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aco: Don't store TCS outputs to LDS when we're sure that none are read.

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This allows us not to write an output to LDS, even if it has
an indirect offset.

No pipeline DB changes.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3964>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3964>
This commit is contained in:
Timur Kristóf 2020-03-09 16:27:54 +01:00 • committed by Marge Bot
parent 9b36d8c23a
commit 61f2e8d9bb
1 changed files with 4 additions and 0 deletions
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4
src/amd/compiler/aco_instruction_selection.cpp
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@ -3339,6 +3339,10 @@ bool should_write_tcs_patch_output_to_lds(isel_context *ctx, nir_intrinsic_instr
unsigned off = nir_intrinsic_base(instr) * 4u;
nir_src *off_src = nir_get_io_offset_src(instr);
/* When none of the appropriate outputs are read, we are OK to never write to LDS */
if (per_vertex ? ctx->shader->info.outputs_read == 0U : ctx->shader->info.patch_outputs_read == 0u)
return false;
/* Indirect offset, we can't be sure if this is read or not, always write to LDS */
if (!nir_src_is_const(*off_src))
return true;