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nir/copy_prop_vars: Get modes directly from derefs

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Instead of going all the way back to the variable, just look at the
deref.  The modes are guaranteed to be the same by nir_validate whenever
the variable can be found.  This fixes apply_barrier_for_modes for
derefs that don't have an accessible variable.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Jason Ekstrand 2018-12-13 16:28:23 -06:00
parent cf7fb39805
commit fa40a58fd9
1 changed files with 2 additions and 6 deletions
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8
src/compiler/nir/nir_opt_copy_prop_vars.c
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@ -337,12 +337,8 @@ apply_barrier_for_modes(struct util_dynarray *copies,
nir_variable_mode modes) nir_variable_mode modes)
{ {
util_dynarray_foreach_reverse(copies, struct copy_entry, iter) { util_dynarray_foreach_reverse(copies, struct copy_entry, iter) {
nir_variable *dst_var = nir_deref_instr_get_variable(iter->dst); if ((iter->dst->mode & modes) ||
nir_variable *src_var = iter->src.is_ssa ? NULL : (!iter->src.is_ssa && (iter->src.deref->mode & modes)))
nir_deref_instr_get_variable(iter->src.deref);
if ((dst_var->data.mode & modes) ||
(src_var && (src_var->data.mode & modes)))
copy_entry_remove(copies, iter); copy_entry_remove(copies, iter);
} }
} }