[gcc r14-1596] Match: zero_one_valued_p should match 0 constants too

[gcc r14-1596] Match: zero_one_valued_p should match 0 constants too

[Andrew Pinski]

https://gcc.gnu.org/g:c5c4fa2f9a448d529be746119ebca4fc5e5701b2

commit r14-1596-gc5c4fa2f9a448d529be746119ebca4fc5e5701b2
Author: Andrew Pinski <apinski@marvell.com>
Date:   Tue Jun 6 08:21:46 2023 -0700

    Match: zero_one_valued_p should match 0 constants too
    
    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.

Diff:
---
 gcc/match.pd | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gcc/match.pd b/gcc/match.pd
index 16482b741ea..7bb7413ff65 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