Booleans are represented as 0/-1 on modern hardware which means we can
just negate them to convert them into a numeric type. Negation has
the benefit that it can be implemented using a source modifier which
can easily be propagated into some other instruction. shader-db
results on HSW:
total instructions in shared programs: 6349082 -> 6346693 (-0.04%)
instructions in affected programs: 40948 -> 38559 (-5.83%)
helped: 123
HURT: 1
GAINED: 1
LOST: 0
Reviewed-by: Matt Turner <mattst88@gmail.com>
Francisco Jerez
3ee2daf23d