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nir/dead_write_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 clear_unused_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 16:30:24 -06:00
parent fa40a58fd9
commit 5dad1abfdc
1 changed files with 1 additions and 2 deletions
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3
src/compiler/nir/nir_opt_dead_write_vars.c
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@ -56,8 +56,7 @@ static void
clear_unused_for_modes(struct util_dynarray *unused_writes, nir_variable_mode modes)
{
util_dynarray_foreach_reverse(unused_writes, struct write_entry, entry) {
nir_variable *var = nir_deref_instr_get_variable(entry->dst);
if (var->data.mode & modes)
if (entry->dst->mode & modes)
*entry = util_dynarray_pop(unused_writes, struct write_entry);
}
}