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glsl: lower IO in the linker if enabled, don't lower it later

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This removes the useless codepath that kept IO derefs until st_finalize_nir.
It was used before nir_opt_varyings existed.

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31968>
This commit is contained in:
Marek Olšák 2024-10-27 13:26:12 -04:00 • committed by Marge Bot
parent 32a537b25b
commit adc40aee25
4 changed files with 11 additions and 32 deletions
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17
src/compiler/glsl/gl_nir_linker.c
View file

@ -1497,6 +1497,7 @@ gl_nir_lower_optimize_varyings(const struct gl_constants *consts,
unsigned num_shaders = 0;
unsigned max_ubos = UINT_MAX;
unsigned max_uniform_comps = UINT_MAX;
bool optimize_io = true;
for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
struct gl_linked_shader *shader = prog->_LinkedShaders[i];
@ -1506,11 +1507,8 @@ gl_nir_lower_optimize_varyings(const struct gl_constants *consts,
nir_shader *nir = shader->Program->nir;
if (nir->info.stage == MESA_SHADER_COMPUTE)
return;
if (!(nir->options->io_options & nir_io_glsl_lower_derefs) ||
!(nir->options->io_options & nir_io_glsl_opt_varyings))
if (nir->info.stage == MESA_SHADER_COMPUTE ||
!(nir->options->io_options & nir_io_glsl_lower_derefs))
return;
shaders[num_shaders] = nir;
@ -1518,14 +1516,15 @@ gl_nir_lower_optimize_varyings(const struct gl_constants *consts,
consts->Program[i].MaxUniformComponents);
max_ubos = MIN2(max_ubos, consts->Program[i].MaxUniformBlocks);
num_shaders++;
optimize_io &= nir->options->io_options & nir_io_glsl_opt_varyings;
}
/* Lower IO derefs to load and store intrinsics. */
for (unsigned i = 0; i < num_shaders; i++) {
nir_shader *nir = shaders[i];
for (unsigned i = 0; i < num_shaders; i++)
nir_lower_io_passes(shaders[i], true);
nir_lower_io_passes(nir, true);
}
if (!optimize_io)
return;
/* There is nothing to optimize for only 1 shader. */
if (num_shaders == 1) {

8
src/compiler/nir/nir.h
View file

@ -3843,13 +3843,7 @@ typedef enum {
nir_io_glsl_lower_derefs = BITFIELD_BIT(16),
/**
* Run nir_opt_varyings in the GLSL linker. If false, optimize varyings
* the old way and lower IO later.
*
* nir_io_lower_to_intrinsics must be set for this to take effect.
*
* TODO: remove this and default to enabled once we are sure that this
* codepath is solid.
* Run nir_opt_varyings in the GLSL linker.
*/
nir_io_glsl_opt_varyings = BITFIELD_BIT(17),
} nir_io_options;

3
src/mesa/main/glspirv.c
View file

@ -335,8 +335,7 @@ _mesa_spirv_to_nir(struct gl_context *ctx,
NIR_PASS(_, nir, nir_split_per_member_structs);
if (nir->info.stage == MESA_SHADER_VERTEX &&
(!(nir->options->io_options & nir_io_glsl_lower_derefs) ||
!(nir->options->io_options & nir_io_glsl_opt_varyings)))
!(nir->options->io_options & nir_io_glsl_lower_derefs))
nir_remap_dual_slot_attributes(nir, &linked_shader->Program->DualSlotInputs);
NIR_PASS(_, nir, nir_lower_frexp);

15
src/mesa/state_tracker/st_glsl_to_nir.cpp
View file

@ -737,8 +737,7 @@ st_link_glsl_to_nir(struct gl_context *ctx,
prog->info.num_abos = old_info.num_abos;
if (prog->info.stage == MESA_SHADER_VERTEX) {
if (prog->nir->info.io_lowered &&
prog->nir->options->io_options & nir_io_glsl_opt_varyings) {
if (prog->nir->info.io_lowered) {
prog->info.inputs_read = prog->nir->info.inputs_read;
prog->DualSlotInputs = prog->nir->info.dual_slot_inputs;
} else {
@ -910,18 +909,6 @@ st_finalize_nir(struct st_context *st, struct gl_program *prog,
st_nir_assign_varying_locations(st, nir);
st_nir_assign_uniform_locations(st->ctx, prog, nir);
/* Lower load_deref/store_deref of inputs and outputs.
* This depends on st_nir_assign_varying_locations.
*
* TODO: remove this once nir_io_glsl_opt_varyings is enabled by default.
*/
if (!is_draw_shader && nir->options->io_options & nir_io_glsl_lower_derefs &&
!(nir->options->io_options & nir_io_glsl_opt_varyings)) {
nir_lower_io_passes(nir, false);
NIR_PASS(_, nir, nir_remove_dead_variables,
nir_var_shader_in | nir_var_shader_out, NULL);
}
/* Set num_uniforms in number of attribute slots (vec4s) */
nir->num_uniforms = DIV_ROUND_UP(prog->Parameters->NumParameterValues, 4);