From: Andrew Pinski <apin...@marvell.com>
I noticed this while Richard B. fixing PR101756.
Basically min of two bools is the same as doing an "and"
and max of two bools is doing an "ior".
gcc/ChangeLog:
* match.pd: Add min/max patterns for bool types.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-ssa/bool-12.c: New test.
---
gcc/match.pd | 10 +++++++++
gcc/testsuite/gcc.dg/tree-ssa/bool-12.c | 27 +++++++++++++++++++++++++
2 files changed, 37 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/bool-12.c
diff --git a/gcc/match.pd b/gcc/match.pd
index b1f2aaaac02..8fd60d08cfe 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -3103,6 +3103,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
&& (GIMPLE || !TREE_SIDE_EFFECTS (@1)))
(cond (cmp @2 @3) @1 @0))))
+/* max(bool0, bool1) -> bool0 | bool1 */
+(simplify
+ (max gimple_truth_valued_p@0 gimple_truth_valued_p@1)
+ (bit_ior @0 @1))
+
+/* min(bool0, bool1) -> bool0 & bool1 */
+(simplify
+ (min gimple_truth_valued_p@0 gimple_truth_valued_p@1)
+ (bit_and @0 @1))
+
/* Simplifications of shift and rotates. */
(for rotate (lrotate rrotate)
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/bool-12.c
b/gcc/testsuite/gcc.dg/tree-ssa/bool-12.c
new file mode 100644
index 00000000000..2d8ad9912d3
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/bool-12.c
@@ -0,0 +1,27 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized -fdump-tree-original" } */
+#define bool _Bool
+int maxbool(bool ab, bool bb)
+{
+ int a = ab;
+ int b = bb;
+ int c;
+ c = (a > b)?a : b;
+ return c;
+}
+int minbool(bool ab, bool bb)
+{
+ int a = ab;
+ int b = bb;
+ int c;
+ c = (a < b)?a : b;
+ return c;
+}
+/* Original should have one of each MAX/MIN expressions. */
+/* { dg-final { scan-tree-dump-times "MAX_EXPR" 1 "original" } */
+/* { dg-final { scan-tree-dump-times "MIN_EXPR" 1 "original"} } */
+
+/* By the time we reach optimized, the MAX and MIN expressions
+ should have been removed. */
+/* { dg-final { scan-tree-dump-times "MAX_EXPR" 0 "optimized"} } */
+/* { dg-final { scan-tree-dump-times "MIN_EXPR" 0 "optimized"} } */
--
2.27.0
