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nir/derefs: Add a nir_derefs_do_not_alias enum value 

This makes some of the code more clear.

Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
This commit is contained in:
Jason Ekstrand 2018-11-19 12:32:16 -06:00
parent eb44c36cf1
commit 199a0353d6
2 changed files with 4 additions and 3 deletions
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6
src/compiler/nir/nir_deref.c
View File

@ -277,7 +277,7 @@ 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;
return nir_derefs_do_not_alias;
/* Start off assuming they fully compare. We ignore equality for now. In
* the end, we'll determine that by containment.
@ -319,7 +319,7 @@ nir_compare_deref_paths(nir_deref_path *a_path,
*/
if (nir_src_as_uint(a_tail->arr.index) !=
nir_src_as_uint(b_tail->arr.index))
return 0;
return nir_derefs_do_not_alias;
} else if (a_tail->arr.index.ssa == b_tail->arr.index.ssa) {
/* They're the same indirect, continue on */
} else {
@ -335,7 +335,7 @@ nir_compare_deref_paths(nir_deref_path *a_path,
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;
return nir_derefs_do_not_alias;
break;
}

1
src/compiler/nir/nir_deref.h
View File

@ -55,6 +55,7 @@ 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_do_not_alias = 0,
nir_derefs_equal_bit = (1 << 0),
nir_derefs_may_alias_bit = (1 << 1),
nir_derefs_a_contains_b_bit = (1 << 2),