While working on `bool0 ? bool1 : bool2` I noticed that
zero_one_valued_p does not match on the constant zero
as in that case tree_nonzero_bits will return 0 and
that is different from 1.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
* match.pd (zero_one_valued_p): Match 0 integer constant
too.
---
gcc/match.pd | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/gcc/match.pd b/gcc/match.pd
index f9cbd757752..f97ff7ef760 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -1983,11 +1983,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
(bit_not (bit_not @0))
@0)
+/* zero_one_valued_p will match when a value is known to be either
+ 0 or 1 including the constant 0. */
(match zero_one_valued_p
@0
(if (INTEGRAL_TYPE_P (type) && tree_nonzero_bits (@0) == 1)))
(match zero_one_valued_p
truth_valued_p@0)
+(match zero_one_valued_p
+ integer_zerop@0
+ (if (INTEGRAL_TYPE_P (type))))
/* Transform { 0 or 1 } * { 0 or 1 } into { 0 or 1 } & { 0 or 1 }. */
(simplify
--
2.31.1
