From: Andrew Pinski <apinski@marvell.com>
Date: Wed, 7 Jun 2023 14:58:50 +0000 (-0700)
Subject: MATCH: Allow unsigned types for `X & -Y -> X * Y` pattern
X-Git-Tag: basepoints/gcc-15~8485
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ceed7e3e29c3375e3b8c4347d1985a72bbe7f11;p=thirdparty%2Fgcc.git

MATCH: Allow unsigned types for `X & -Y -> X * Y` pattern

This allows unsigned types if the inner type where the negation is
located has greater than or equal to precision than the outer type.

branchless-cond.c needs to be updated since now we change it to
use a multiply rather than still having (-a)&c in there.

OK? Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* match.pd (`X & -Y -> X * Y`): Allow for truncation
	and the same type for unsigned types.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/branchless-cond.c: Update testcase.
---

diff --git a/gcc/match.pd b/gcc/match.pd
index 335e3535184b..77030b3b50b9 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -2065,7 +2065,10 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
  (if (INTEGRAL_TYPE_P (type)
       && INTEGRAL_TYPE_P (TREE_TYPE (@0))
       && TREE_CODE (TREE_TYPE (@0)) != BOOLEAN_TYPE
-      && !TYPE_UNSIGNED (TREE_TYPE (@0)))
+      /* Sign extending of the neg or a truncation of the neg
+         is needed. */
+      && (!TYPE_UNSIGNED (TREE_TYPE (@0))
+	  || TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0))))
   (mult (convert @0) @1)))
 
 /* Narrow integer multiplication by a zero_one_valued_p operand.
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c b/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c
index 68087ae65683..e063dc4bb5fb 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/branchless-cond.c
@@ -21,6 +21,6 @@ int f4(unsigned int x, unsigned int y, unsigned int z)
   return ((x & 1) != 0) ? z | y : y;
 }
 
-/* { dg-final { scan-tree-dump-times " -" 4 "optimized" } } */
-/* { dg-final { scan-tree-dump-times " & " 8 "optimized" } } */
-/* { dg-final { scan-tree-dump-not "if" "optimized" } } */
+/* { dg-final { scan-tree-dump-times " \\\*" 4 "optimized" } } */
+/* { dg-final { scan-tree-dump-times " & " 4 "optimized" } } */
+/* { dg-final { scan-tree-dump-not "if " "optimized" } } */