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nir: fix algebraic optimizations

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The optimizations are only valid for 32-bit integers. They were
mistakenly firing for 64-bit integers as well.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Connor Abbott 2017-07-31 18:26:49 -07:00
parent d62063ce31
commit de91461575
1 changed files with 2 additions and 2 deletions
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4
src/compiler/nir/nir_opt_algebraic.py
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@ -250,8 +250,8 @@ optimizations = [
(('ishr', a, 0), a),
(('ushr', 0, a), 0),
(('ushr', a, 0), a),
(('iand', 0xff, ('ushr', a, 24)), ('ushr', a, 24)),
(('iand', 0xffff, ('ushr', a, 16)), ('ushr', a, 16)),
(('iand', 0xff, ('ushr@32', a, 24)), ('ushr', a, 24)),
(('iand', 0xffff, ('ushr@32', a, 16)), ('ushr', a, 16)),
# Exponential/logarithmic identities
(('~fexp2', ('flog2', a)), a), # 2^lg2(a) = a
(('~flog2', ('fexp2', a)), a), # lg2(2^a) = a