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nir: Constant fold array indirects

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Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-12-05 12:05:55 -08:00
parent cd4b995254
commit 6a5604ca6a
1 changed files with 76 additions and 8 deletions
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84
src/glsl/nir/nir_opt_constant_folding.c
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@ -49,9 +49,8 @@ struct constant_fold_state {
} \
static bool
constant_fold_alu_instr(nir_alu_instr *instr, void *void_state)
constant_fold_alu_instr(nir_alu_instr *instr, void *mem_ctx)
{
struct constant_fold_state *state = void_state;
nir_load_const_instr *src[4], *dest;
if (!instr->dest.dest.is_ssa)
@ -73,7 +72,7 @@ constant_fold_alu_instr(nir_alu_instr *instr, void *void_state)
/* We shouldn't have any saturate modifiers in the optimization loop. */
assert(!instr->dest.saturate);
dest = nir_load_const_instr_create(state->mem_ctx);
dest = nir_load_const_instr_create(mem_ctx);
dest->array_elems = 0;
dest->num_components = instr->dest.dest.ssa.num_components;
@ -228,7 +227,7 @@ constant_fold_alu_instr(nir_alu_instr *instr, void *void_state)
.ssa = &dest->dest.ssa,
};
nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, new_src, state->mem_ctx);
nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, new_src, mem_ctx);
nir_instr_remove(&instr->instr);
ralloc_free(instr);
@ -236,16 +235,85 @@ constant_fold_alu_instr(nir_alu_instr *instr, void *void_state)
return true;
}
static bool
constant_fold_deref(nir_instr *instr, nir_deref_var *deref)
{
bool progress = false;
for (nir_deref *tail = deref->deref.child; tail; tail = tail->child) {
if (tail->deref_type != nir_deref_type_array)
continue;
nir_deref_array *arr = nir_deref_as_array(tail);
if (arr->deref_array_type == nir_deref_array_type_indirect &&
arr->indirect.is_ssa &&
arr->indirect.ssa->parent_instr->type == nir_instr_type_load_const) {
nir_load_const_instr *indirect =
nir_instr_as_load_const(arr->indirect.ssa->parent_instr);
arr->base_offset += indirect->value.u[0];
nir_src empty = {
.is_ssa = true,
.ssa = NULL,
};
nir_instr_rewrite_src(instr, &arr->indirect, empty);
arr->deref_array_type = nir_deref_array_type_direct;
progress = true;
}
}
return progress;
}
static bool
constant_fold_intrinsic_instr(nir_intrinsic_instr *instr)
{
bool progress = false;
unsigned num_vars = nir_intrinsic_infos[instr->intrinsic].num_variables;
for (unsigned i = 0; i < num_vars; i++) {
progress |= constant_fold_deref(&instr->instr, instr->variables[i]);
}
return progress;
}
static bool
constant_fold_tex_instr(nir_tex_instr *instr)
{
if (instr->sampler)
return constant_fold_deref(&instr->instr, instr->sampler);
else
return false;
}
static bool
constant_fold_block(nir_block *block, void *void_state)
{
struct constant_fold_state *state = void_state;
nir_foreach_instr_safe(block, instr) {
if (instr->type != nir_instr_type_alu)
continue;
state->progress |= constant_fold_alu_instr(nir_instr_as_alu(instr), state);
switch (instr->type) {
case nir_instr_type_alu:
state->progress |= constant_fold_alu_instr(nir_instr_as_alu(instr),
state->mem_ctx);
break;
case nir_instr_type_intrinsic:
state->progress |=
constant_fold_intrinsic_instr(nir_instr_as_intrinsic(instr));
break;
case nir_instr_type_tex:
state->progress |= constant_fold_tex_instr(nir_instr_as_tex(instr));
break;
default:
/* Don't know how to constant fold */
break;
}
}
return true;