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tree-optimization/103514 Missing XOR-EQ-AND Optimization

Message ID BN6PR21MB01629E8E6E8B71D7F1553530A34B9@BN6PR21MB0162.namprd21.prod.outlook.com
State New
Headers show
Series tree-optimization/103514 Missing XOR-EQ-AND Optimization | expand

Commit Message

Navid Rahimi Jan. 5, 2022, 8:12 p.m. UTC 
Hi GCC community,

This patch will add the missed pattern described in bug 103514 [1] to the match.pd. [1] includes proof of correctness for the patch too. 

PR tree-optimization/103514
	* match.pd (a & b) ^ (a == b) -> !(a | b): New optimization.
	* match.pd (a & b) == (a ^ b) -> !(a | b): New optimization.
	* gcc.dg/tree-ssa/pr103514.c: Testcase for this optimization.

1) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103514

Best wishes,
Navid.

Comments

Jeff Law Jan. 28, 2022, 10:14 p.m. UTC | #1 
On 1/5/2022 1:12 PM, Navid Rahimi via Gcc-patches wrote:
> Hi GCC community,
>
> This patch will add the missed pattern described in bug 103514 [1] to the match.pd. [1] includes proof of correctness for the patch too.
>
> PR tree-optimization/103514
> 	* match.pd (a & b) ^ (a == b) -> !(a | b): New optimization.
> 	* match.pd (a & b) == (a ^ b) -> !(a | b): New optimization.
> 	* gcc.dg/tree-ssa/pr103514.c: Testcase for this optimization.
>
> 1) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103514
Note the bug was filed an fixed during stage3, review just didn't happen 
in a reasonable timeframe.

I'm going to ACK this for the trunk and go ahead and commit it for you.

Thanks for your patience,
jeff
diff mbox series

Patch

From 7bc34478cc3a494bb634625281b5f03e43f210a9 Mon Sep 17 00:00:00 2001
From: Navid Rahimi <navidrahimi@microsoft.com>
Date: Wed, 1 Dec 2021 00:00:54 -0800
Subject: [PATCH] tree-optimization/103514 Missing XOR-EQ-AND Optimization

	* match.pd (a & b) ^ (a == b) -> !(a | b): New optimization.
	* match.pd (a & b) == (a ^ b) -> !(a | b): New optimization.
	* gcc.dg/tree-ssa/pr103514.c: Testcase for this optimization.
---
 gcc/match.pd                             |  8 ++++++
 gcc/testsuite/gcc.dg/tree-ssa/pr103514.c | 33 ++++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr103514.c

diff --git a/gcc/match.pd b/gcc/match.pd
index 0d7b8dd1334..df55206d2ec 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -1768,6 +1768,14 @@  DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
  (negate (nop_convert? (bit_not @0)))
  (plus (view_convert @0) { build_each_one_cst (type); }))
 
+/* (a & b) ^ (a == b) -> !(a | b) */
+/* (a & b) == (a ^ b) -> !(a | b) */
+(for first_op (bit_xor eq)
+     second_op (eq bit_xor)
+ (simplify
+  (first_op:c (bit_and:c truth_valued_p@0 truth_valued_p@1) (second_op:c @0 @1))
+    (bit_not (bit_ior @0 @1))))
+
 /* Convert ~ (A - 1) or ~ (A + -1) to -A.  */
 (simplify
  (bit_not (convert? (minus @0 integer_each_onep)))
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c b/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c
new file mode 100644
index 00000000000..5942ad37bf0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr103514.c
@@ -0,0 +1,33 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O -fdump-tree-optimized" } */
+#include <stdbool.h>
+
+bool
+i (bool a, bool b)
+{
+     return (a & b) ^ (a == b);
+}
+
+bool
+j (bool a, bool b)
+{
+     return (a & b) == (a ^ b);
+}
+
+bool
+g (bool a, bool b)
+{
+    return (a && b) == (a ^ b); 
+}
+
+bool
+h (bool a, bool b)
+{
+     return (a && b) ^ (a == b);
+}
+
+
+/* Make sure we have removed "==" and "^" and "&". */
+/* { dg-final { scan-tree-dump-not "&" "optimized"} } */
+/* { dg-final { scan-tree-dump-not "\\^"  "optimized"} } */
+/* { dg-final { scan-tree-dump-not "==" "optimized"} } */
\ No newline at end of file
-- 
2.25.1