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nir: Add a pass for fixing deref modes

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This will be needed by anything which changes variable modes without
rewriting derefs.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Acked-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand 2018-03-15 15:37:50 -07:00
parent f917814c14
commit 54e440945e
2 changed files with 32 additions and 0 deletions
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2
src/compiler/nir/nir.h
View file

@ -2701,6 +2701,8 @@ bool nir_lower_deref_instrs(nir_shader *shader,
void nir_lower_var_copy_instr(nir_intrinsic_instr *copy, nir_shader *shader);
bool nir_lower_var_copies(nir_shader *shader);
void nir_fixup_deref_modes(nir_shader *shader);
bool nir_lower_global_vars_to_local(nir_shader *shader);
bool nir_lower_indirect_derefs(nir_shader *shader, nir_variable_mode modes);

30
src/compiler/nir/nir_deref.c
View file

@ -354,3 +354,33 @@ nir_lower_deref_instrs(nir_shader *shader,
return progress;
}
void
nir_fixup_deref_modes(nir_shader *shader)
{
nir_foreach_function(function, shader) {
if (!function->impl)
continue;
nir_foreach_block(block, function->impl) {
nir_foreach_instr(instr, block) {
if (instr->type != nir_instr_type_deref)
continue;
nir_deref_instr *deref = nir_instr_as_deref(instr);
nir_variable_mode parent_mode;
if (deref->deref_type == nir_deref_type_var) {
parent_mode = deref->var->data.mode;
} else {
assert(deref->parent.is_ssa);
nir_deref_instr *parent =
nir_instr_as_deref(deref->parent.ssa->parent_instr);
parent_mode = parent->mode;
}
deref->mode = parent_mode;
}
}
}
}