[Mesa-dev] [PATCH 2/9] nir: Export deref comparison functions
Jason Ekstrand
jason at jlekstrand.net
Sat Aug 25 13:10:10 UTC 2018
On Wed, Aug 15, 2018 at 4:57 PM Caio Marcelo de Oliveira Filho <
caio.oliveira at intel.com> wrote:
> Reviewed-by: Timothy Arceri <tarceri at itsqueeze.com>
> ---
> src/compiler/nir/nir_deref.c | 109 ++++++++++++++++
> src/compiler/nir/nir_deref.h | 10 ++
> src/compiler/nir/nir_opt_copy_prop_vars.c | 145 ++--------------------
> 3 files changed, 132 insertions(+), 132 deletions(-)
>
> diff --git a/src/compiler/nir/nir_deref.c b/src/compiler/nir/nir_deref.c
> index c03acf83597..d013b423a8b 100644
> --- a/src/compiler/nir/nir_deref.c
> +++ b/src/compiler/nir/nir_deref.c
> @@ -270,3 +270,112 @@ nir_fixup_deref_modes(nir_shader *shader)
> }
> }
> }
> +
> +/** Returns true if the storage referrenced to by deref completely
> contains
> + * the storage referenced by sub.
>
Please fix this comment while we're here. It's so out of date as to be
laughable.
> + */
> +nir_deref_compare_result
> +nir_compare_deref_paths(nir_deref_path *a_path,
> + nir_deref_path *b_path)
> +{
> + if (a_path->path[0]->var != b_path->path[0]->var)
> + return 0;
> +
> + /* Start off assuming they fully compare. We ignore equality for
> now. In
> + * the end, we'll determine that by containment.
> + */
> + nir_deref_compare_result result = nir_derefs_may_alias_bit |
> + nir_derefs_a_contains_b_bit |
> + nir_derefs_b_contains_a_bit;
> +
> + nir_deref_instr **a_p = &a_path->path[1];
> + nir_deref_instr **b_p = &b_path->path[1];
> + while (*a_p != NULL && *b_p != NULL) {
> + nir_deref_instr *a_tail = *(a_p++);
> + nir_deref_instr *b_tail = *(b_p++);
> +
> + switch (a_tail->deref_type) {
> + case nir_deref_type_array:
> + case nir_deref_type_array_wildcard: {
> + assert(b_tail->deref_type == nir_deref_type_array ||
> + b_tail->deref_type == nir_deref_type_array_wildcard);
> +
> + if (a_tail->deref_type == nir_deref_type_array_wildcard) {
> + if (b_tail->deref_type != nir_deref_type_array_wildcard)
> + result &= ~nir_derefs_b_contains_a_bit;
> + } else if (b_tail->deref_type == nir_deref_type_array_wildcard) {
> + if (a_tail->deref_type != nir_deref_type_array_wildcard)
> + result &= ~nir_derefs_a_contains_b_bit;
> + } else {
> + assert(a_tail->deref_type == nir_deref_type_array &&
> + b_tail->deref_type == nir_deref_type_array);
> + assert(a_tail->arr.index.is_ssa && b_tail->arr.index.is_ssa);
> +
> + nir_const_value *a_index_const =
> + nir_src_as_const_value(a_tail->arr.index);
> + nir_const_value *b_index_const =
> + nir_src_as_const_value(b_tail->arr.index);
> + if (a_index_const && b_index_const) {
> + /* If they're both direct and have different offsets, they
> + * don't even alias much less anything else.
> + */
> + if (a_index_const->u32[0] != b_index_const->u32[0])
> + return 0;
> + } else if (a_tail->arr.index.ssa == b_tail->arr.index.ssa) {
> + /* They're the same indirect, continue on */
> + } else {
> + /* They're not the same index so we can't prove anything
> about
> + * containment.
> + */
> + result &= ~(nir_derefs_a_contains_b_bit |
> nir_derefs_b_contains_a_bit);
> + }
> + }
> + break;
> + }
> +
> + case nir_deref_type_struct: {
> + /* If they're different struct members, they don't even alias */
> + if (a_tail->strct.index != b_tail->strct.index)
> + return 0;
> + break;
> + }
> +
> + default:
> + unreachable("Invalid deref type");
> + }
> + }
> +
> + /* If a is longer than b, then it can't contain b */
> + if (*a_p != NULL)
> + result &= ~nir_derefs_a_contains_b_bit;
> + if (*b_p != NULL)
> + result &= ~nir_derefs_b_contains_a_bit;
> +
> + /* If a contains b and b contains a they must be equal. */
> + if ((result & nir_derefs_a_contains_b_bit) && (result &
> nir_derefs_b_contains_a_bit))
> + result |= nir_derefs_equal_bit;
> +
> + return result;
> +}
> +
> +nir_deref_compare_result
> +nir_compare_derefs(nir_deref_instr *a, nir_deref_instr *b)
> +{
> + if (a == b) {
> + return nir_derefs_equal_bit | nir_derefs_may_alias_bit |
> + nir_derefs_a_contains_b_bit | nir_derefs_b_contains_a_bit;
> + }
> +
> + nir_deref_path a_path, b_path;
> + nir_deref_path_init(&a_path, a, NULL);
> + nir_deref_path_init(&b_path, b, NULL);
> + assert(a_path.path[0]->deref_type == nir_deref_type_var);
> + assert(b_path.path[0]->deref_type == nir_deref_type_var);
> +
> + nir_deref_compare_result result = nir_compare_deref_paths(&a_path,
> &b_path);
> +
> + nir_deref_path_finish(&a_path);
> + nir_deref_path_finish(&b_path);
> +
> + return result;
> +}
> diff --git a/src/compiler/nir/nir_deref.h b/src/compiler/nir/nir_deref.h
> index 6f4141aaf82..c61c3f9366f 100644
> --- a/src/compiler/nir/nir_deref.h
> +++ b/src/compiler/nir/nir_deref.h
> @@ -54,6 +54,16 @@ unsigned
> nir_deref_instr_get_const_offset(nir_deref_instr *deref,
> nir_ssa_def *nir_build_deref_offset(nir_builder *b, nir_deref_instr
> *deref,
> glsl_type_size_align_func size_align);
>
> +typedef enum {
> + nir_derefs_equal_bit = (1 << 0),
> + nir_derefs_may_alias_bit = (1 << 1),
> + nir_derefs_a_contains_b_bit = (1 << 2),
> + nir_derefs_b_contains_a_bit = (1 << 3),
> +} nir_deref_compare_result;
> +
> +nir_deref_compare_result nir_compare_deref_paths(nir_deref_path *a_path,
> nir_deref_path *b_path);
> +nir_deref_compare_result nir_compare_derefs(nir_deref_instr *a,
> nir_deref_instr *b);
> +
> #ifdef __cplusplus
> } /* extern "C" */
> #endif
> diff --git a/src/compiler/nir/nir_opt_copy_prop_vars.c
> b/src/compiler/nir/nir_opt_copy_prop_vars.c
> index d8c4cab34d7..9fecaf0eeec 100644
> --- a/src/compiler/nir/nir_opt_copy_prop_vars.c
> +++ b/src/compiler/nir/nir_opt_copy_prop_vars.c
> @@ -114,125 +114,6 @@ copy_entry_remove(struct copy_prop_var_state *state,
> struct copy_entry *entry)
> list_add(&entry->link, &state->copy_free_list);
> }
>
> -enum deref_compare_result {
> - derefs_equal_bit = (1 << 0),
> - derefs_may_alias_bit = (1 << 1),
> - derefs_a_contains_b_bit = (1 << 2),
> - derefs_b_contains_a_bit = (1 << 3),
> -};
> -
> -/** Returns true if the storage referrenced to by deref completely
> contains
> - * the storage referenced by sub.
> - *
> - * NOTE: This is fairly general and could be moved to core NIR if someone
> else
> - * ever needs it.
> - */
> -static enum deref_compare_result
> -compare_deref_paths(nir_deref_path *a_path,
> - nir_deref_path *b_path)
> -{
> - if (a_path->path[0]->var != b_path->path[0]->var)
> - return 0;
> -
> - /* Start off assuming they fully compare. We ignore equality for
> now. In
> - * the end, we'll determine that by containment.
> - */
> - enum deref_compare_result result = derefs_may_alias_bit |
> - derefs_a_contains_b_bit |
> - derefs_b_contains_a_bit;
> -
> - nir_deref_instr **a_p = &a_path->path[1];
> - nir_deref_instr **b_p = &b_path->path[1];
> - while (*a_p != NULL && *b_p != NULL) {
> - nir_deref_instr *a_tail = *(a_p++);
> - nir_deref_instr *b_tail = *(b_p++);
> -
> - switch (a_tail->deref_type) {
> - case nir_deref_type_array:
> - case nir_deref_type_array_wildcard: {
> - assert(b_tail->deref_type == nir_deref_type_array ||
> - b_tail->deref_type == nir_deref_type_array_wildcard);
> -
> - if (a_tail->deref_type == nir_deref_type_array_wildcard) {
> - if (b_tail->deref_type != nir_deref_type_array_wildcard)
> - result &= ~derefs_b_contains_a_bit;
> - } else if (b_tail->deref_type == nir_deref_type_array_wildcard) {
> - if (a_tail->deref_type != nir_deref_type_array_wildcard)
> - result &= ~derefs_a_contains_b_bit;
> - } else {
> - assert(a_tail->deref_type == nir_deref_type_array &&
> - b_tail->deref_type == nir_deref_type_array);
> - assert(a_tail->arr.index.is_ssa && b_tail->arr.index.is_ssa);
> -
> - nir_const_value *a_index_const =
> - nir_src_as_const_value(a_tail->arr.index);
> - nir_const_value *b_index_const =
> - nir_src_as_const_value(b_tail->arr.index);
> - if (a_index_const && b_index_const) {
> - /* If they're both direct and have different offsets, they
> - * don't even alias much less anything else.
> - */
> - if (a_index_const->u32[0] != b_index_const->u32[0])
> - return 0;
> - } else if (a_tail->arr.index.ssa == b_tail->arr.index.ssa) {
> - /* They're the same indirect, continue on */
> - } else {
> - /* They're not the same index so we can't prove anything
> about
> - * containment.
> - */
> - result &= ~(derefs_a_contains_b_bit |
> derefs_b_contains_a_bit);
> - }
> - }
> - break;
> - }
> -
> - case nir_deref_type_struct: {
> - /* If they're different struct members, they don't even alias */
> - if (a_tail->strct.index != b_tail->strct.index)
> - return 0;
> - break;
> - }
> -
> - default:
> - unreachable("Invalid deref type");
> - }
> - }
> -
> - /* If a is longer than b, then it can't contain b */
> - if (*a_p != NULL)
> - result &= ~derefs_a_contains_b_bit;
> - if (*b_p != NULL)
> - result &= ~derefs_b_contains_a_bit;
> -
> - /* If a contains b and b contains a they must be equal. */
> - if ((result & derefs_a_contains_b_bit) && (result &
> derefs_b_contains_a_bit))
> - result |= derefs_equal_bit;
> -
> - return result;
> -}
> -
> -static enum deref_compare_result
> -compare_derefs(nir_deref_instr *a, nir_deref_instr *b)
> -{
> - if (a == b) {
> - return derefs_equal_bit | derefs_may_alias_bit |
> - derefs_a_contains_b_bit | derefs_b_contains_a_bit;
> - }
> -
> - nir_deref_path a_path, b_path;
> - nir_deref_path_init(&a_path, a, NULL);
> - nir_deref_path_init(&b_path, b, NULL);
> - assert(a_path.path[0]->deref_type == nir_deref_type_var);
> - assert(b_path.path[0]->deref_type == nir_deref_type_var);
> -
> - enum deref_compare_result result = compare_deref_paths(&a_path,
> &b_path);
> -
> - nir_deref_path_finish(&a_path);
> - nir_deref_path_finish(&b_path);
> -
> - return result;
> -}
> -
> static void
> remove_dead_writes(struct copy_prop_var_state *state,
> struct copy_entry *entry, unsigned write_mask)
> @@ -274,10 +155,10 @@ remove_dead_writes(struct copy_prop_var_state *state,
> static struct copy_entry *
> lookup_entry_for_deref(struct copy_prop_var_state *state,
> nir_deref_instr *deref,
> - enum deref_compare_result allowed_comparisons)
> + nir_deref_compare_result allowed_comparisons)
> {
> list_for_each_entry(struct copy_entry, iter, &state->copies, link) {
> - if (compare_derefs(iter->dst, deref) & allowed_comparisons)
> + if (nir_compare_derefs(iter->dst, deref) & allowed_comparisons)
> return iter;
> }
>
> @@ -289,7 +170,7 @@ mark_aliased_entries_as_read(struct
> copy_prop_var_state *state,
> nir_deref_instr *deref, unsigned components)
> {
> list_for_each_entry(struct copy_entry, iter, &state->copies, link) {
> - if (compare_derefs(iter->dst, deref) & derefs_may_alias_bit)
> + if (nir_compare_derefs(iter->dst, deref) & nir_derefs_may_alias_bit)
> iter->comps_may_be_read |= components;
> }
> }
> @@ -303,23 +184,23 @@ get_entry_and_kill_aliases(struct
> copy_prop_var_state *state,
> list_for_each_entry_safe(struct copy_entry, iter, &state->copies,
> link) {
> if (!iter->src.is_ssa) {
> /* If this write aliases the source of some entry, get rid of it
> */
> - if (compare_derefs(iter->src.deref, deref) &
> derefs_may_alias_bit) {
> + if (nir_compare_derefs(iter->src.deref, deref) &
> nir_derefs_may_alias_bit) {
> copy_entry_remove(state, iter);
> continue;
> }
> }
>
> - enum deref_compare_result comp = compare_derefs(iter->dst, deref);
> + nir_deref_compare_result comp = nir_compare_derefs(iter->dst,
> deref);
> /* This is a store operation. If we completely overwrite some
> value, we
> * want to delete any dead writes that may be present.
> */
> - if (comp & derefs_b_contains_a_bit)
> + if (comp & nir_derefs_b_contains_a_bit)
> remove_dead_writes(state, iter, write_mask);
>
> - if (comp & derefs_equal_bit) {
> + if (comp & nir_derefs_equal_bit) {
> assert(entry == NULL);
> entry = iter;
> - } else if (comp & derefs_may_alias_bit) {
> + } else if (comp & nir_derefs_may_alias_bit) {
> copy_entry_remove(state, iter);
> }
> }
> @@ -613,7 +494,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
> mark_aliased_entries_as_read(state, src, comps_read);
>
> struct copy_entry *src_entry =
> - lookup_entry_for_deref(state, src, derefs_a_contains_b_bit);
> + lookup_entry_for_deref(state, src,
> nir_derefs_a_contains_b_bit);
> struct value value;
> if (try_load_from_entry(state, src_entry, b, intrin, src,
> &value)) {
> if (value.is_ssa) {
> @@ -658,7 +539,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
> * contains what we're looking for.
> */
> struct copy_entry *store_entry =
> - lookup_entry_for_deref(state, src, derefs_equal_bit);
> + lookup_entry_for_deref(state, src, nir_derefs_equal_bit);
> if (!store_entry)
> store_entry = copy_entry_create(state, src);
>
> @@ -692,7 +573,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
> nir_deref_instr *dst = nir_src_as_deref(intrin->src[0]);
> nir_deref_instr *src = nir_src_as_deref(intrin->src[1]);
>
> - if (compare_derefs(src, dst) & derefs_equal_bit) {
> + if (nir_compare_derefs(src, dst) & nir_derefs_equal_bit) {
> /* This is a no-op self-copy. Get rid of it */
> nir_instr_remove(instr);
> continue;
> @@ -701,7 +582,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
> mark_aliased_entries_as_read(state, src, 0xf);
>
> struct copy_entry *src_entry =
> - lookup_entry_for_deref(state, src, derefs_a_contains_b_bit);
> + lookup_entry_for_deref(state, src,
> nir_derefs_a_contains_b_bit);
> struct value value;
> if (try_load_from_entry(state, src_entry, b, intrin, src,
> &value)) {
> if (value.is_ssa) {
> @@ -709,7 +590,7 @@ copy_prop_vars_block(struct copy_prop_var_state *state,
> intrin = nir_instr_as_intrinsic(nir_builder_last_instr(b));
> } else {
> /* If this would be a no-op self-copy, don't bother. */
> - if (compare_derefs(value.deref, dst) & derefs_equal_bit)
> + if (nir_compare_derefs(value.deref, dst) &
> nir_derefs_equal_bit)
> continue;
>
> /* Just turn it into a copy of a different deref */
> --
> 2.18.0
>
> _______________________________________________
> mesa-dev mailing list
> mesa-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/mesa-dev
>
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