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aco: Skip TCS s_barrier when VS outputs are not stored in the LDS.

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When VS outputs are known to be never stored in LDS, there is no
reason for HS waves to wait for all LS waves to complete. So, the
s_barrier between the LS and HS can be safely skipped.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7727>
This commit is contained in:
Timur Kristóf 2020-11-23 09:42:25 +01:00 • committed by Marge Bot
parent 790144e65a
commit a9a8e05b69
1 changed files with 5 additions and 1 deletions
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6
src/amd/compiler/aco_instruction_selection.cpp
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@ -11793,7 +11793,11 @@ void select_program(Program *program,
if (i) {
Builder bld(ctx.program, ctx.block);
if (!ngg_gs)
/* Skip s_barrier from TCS when VS outputs are not stored in the LDS. */
bool tcs_skip_barrier = ctx.stage == vertex_tess_control_hs &&
ctx.tcs_temp_only_inputs == nir->info.inputs_read;
if (!ngg_gs && !tcs_skip_barrier)
create_workgroup_barrier(bld);
if (ctx.stage == vertex_geometry_gs || ctx.stage == tess_eval_geometry_gs) {