From: Andrew Pinski <apinski@marvell.com>
Date: Tue, 6 Jun 2023 15:21:46 +0000 (-0700)
Subject: Match: zero_one_valued_p should match 0 constants too
X-Git-Tag: basepoints/gcc-15~8543
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c5c4fa2f9a448d529be746119ebca4fc5e5701b2;p=thirdparty%2Fgcc.git

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 --git a/gcc/match.pd b/gcc/match.pd
index 16482b741ea8..7bb7413ff652 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