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nir/algebraic: Loosen a restriction on variables

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Previously, we would fail if a variable had an assigned but unknown bit
size X and we tried to assign it an actual bit size.  However, this is
ok because, at the time we do the search, the variable does have an
actual bit size and it will match X because of the NIR rules.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
This commit is contained in:
Jason Ekstrand 2018-10-19 14:31:19 -05:00
parent ea9e651423
commit 932c650e0b
1 changed files with 6 additions and 2 deletions
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8
src/compiler/nir/nir_algebraic.py
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@ -352,8 +352,12 @@ class BitSizeValidator(object):
if var_class == 0:
self._var_classes[var.index] = bit_class
else:
canon_class = self._class_relation.get_canonical(var_class)
assert canon_class < 0 or canon_class == bit_class
canon_bit_class = self._class_relation.get_canonical(var_class)
canon_var_class = self._class_relation.get_canonical(bit_class)
assert canon_var_class < 0 or canon_bit_class < 0 or \
canon_var_class == canon_bit_class, \
'Variable {0} cannot be both {1}-bit and {2}-bit' \
.format(str(var), bit_class, var_class)
var_class = self._class_relation.add_equiv(var_class, bit_class)
self._var_classes[var.index] = var_class