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nir: add component level support to remove_unused_io_vars()

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Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Timothy Arceri 2017-09-26 13:18:58 +10:00
parent 9f7127f5d2
commit f1eb5e6399
1 changed files with 21 additions and 16 deletions
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37
src/compiler/nir/nir_linking_helpers.c
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@ -56,11 +56,9 @@ get_variable_io_mask(nir_variable *var, gl_shader_stage stage)
return ((1ull << slots) - 1) << var->data.location;
}
static uint64_t
tcs_output_read_bitmask(nir_shader *shader)
static void
tcs_add_output_reads(nir_shader *shader, uint64_t *read)
{
uint64_t read = 0;
nir_foreach_function(function, shader) {
if (function->impl) {
nir_foreach_block(block, function->impl) {
@ -73,20 +71,21 @@ tcs_output_read_bitmask(nir_shader *shader)
if (intrin_instr->intrinsic == nir_intrinsic_load_var &&
intrin_instr->variables[0]->var->data.mode ==
nir_var_shader_out) {
read |= get_variable_io_mask(intrin_instr->variables[0]->var,
shader->stage);
nir_variable *var = intrin_instr->variables[0]->var;
read[var->data.location_frac] |=
get_variable_io_mask(intrin_instr->variables[0]->var,
shader->stage);
}
}
}
}
}
return read;
}
static bool
remove_unused_io_vars(nir_shader *shader, struct exec_list *var_list,
uint64_t used_by_other_stage)
uint64_t *used_by_other_stage)
{
bool progress = false;
@ -101,7 +100,9 @@ remove_unused_io_vars(nir_shader *shader, struct exec_list *var_list,
if (var->data.always_active_io)
continue;
if (!(used_by_other_stage & get_variable_io_mask(var, shader->stage))) {
uint64_t other_stage = used_by_other_stage[var->data.location_frac];
if (!(other_stage & get_variable_io_mask(var, shader->stage))) {
/* This one is invalid, make it a global variable instead */
var->data.location = 0;
var->data.mode = nir_var_global;
@ -122,20 +123,24 @@ nir_remove_unused_varyings(nir_shader *producer, nir_shader *consumer)
assert(producer->stage != MESA_SHADER_FRAGMENT);
assert(consumer->stage != MESA_SHADER_VERTEX);
uint64_t read = 0, written = 0;
uint64_t read[4] = { 0 }, written[4] = { 0 };
nir_foreach_variable(var, &producer->outputs)
written |= get_variable_io_mask(var, producer->stage);
nir_foreach_variable(var, &producer->outputs) {
written[var->data.location_frac] |=
get_variable_io_mask(var, producer->stage);
}
nir_foreach_variable(var, &consumer->inputs)
read |= get_variable_io_mask(var, consumer->stage);
nir_foreach_variable(var, &consumer->inputs) {
read[var->data.location_frac] |=
get_variable_io_mask(var, consumer->stage);
}
/* Each TCS invocation can read data written by other TCS invocations,
* so even if the outputs are not used by the TES we must also make
* sure they are not read by the TCS before demoting them to globals.
*/
if (producer->stage == MESA_SHADER_TESS_CTRL)
read |= tcs_output_read_bitmask(producer);
tcs_add_output_reads(producer, read);
bool progress = false;
progress = remove_unused_io_vars(producer, &producer->outputs, read);