re PR middle-end/35691 (Missed (a == 0) && (b == 0) into (a|(typeof(a)(b)) == 0 when...

2016-11-07  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR middle-end/35691
	* match.pd: Add following two patterns:
	(x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
	(x != 0 | y != 0) -> (x | typeof(x)(y)) != 0.

testsuite/
	* gcc.dg/pr35691-1.c: New test-case.
	* gcc.dg/pr35691-4.c: Likewise.

From-SVN: r241915

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 331540092d1e23ffd8362738a1e95f0e89382606..1902dbb410794d7d3cd24c07fea6c1d8f1761b71 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2016-11-07  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+       PR middle-end/35691
+       * match.pd: Add following two patterns:
+       (x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
+       (x != 0 | y != 0) -> (x | typeof(x)(y)) != 0.
+
 2016-11-07  Bernd Schmidt  <bschmidt@redhat.com>
 
        * emit-rtl.c (emit_copy_of_insn_after): Duplicate notes in order.

diff --git a/gcc/match.pd b/gcc/match.pd
index 48f73514a3fa6bfef3e4af0b8cbdce6eed46470f..29ddcd82a1880c2d492dc26cd96d41e5b5d54ef4 100644 (file)
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -519,6 +519,18 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (if (TYPE_UNSIGNED (type))
     (bit_and @0 (bit_not (lshift { build_all_ones_cst (type); } @1)))))
 
+/* PR35691: Transform
+   (x == 0 & y == 0) -> (x | typeof(x)(y)) == 0.
+   (x != 0 | y != 0) -> (x | typeof(x)(y)) != 0.  */
+(for bitop (bit_and bit_ior)
+     cmp (eq ne)
+ (simplify
+  (bitop (cmp @0 integer_zerop@2) (cmp @1 integer_zerop))
+   (if (INTEGRAL_TYPE_P (TREE_TYPE (@0))
+       && INTEGRAL_TYPE_P (TREE_TYPE (@1))
+       && TYPE_PRECISION (TREE_TYPE (@0)) == TYPE_PRECISION (TREE_TYPE (@1)))
+    (cmp (bit_ior @0 (convert @1)) @2))))
+
 /* Fold (A & ~B) - (A & B) into (A ^ B) - B.  */
 (simplify
  (minus (bit_and:cs @0 (bit_not @1)) (bit_and:cs @0 @1))

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 6e12b1ab86e5fcae1e9ae4171d007e284d149e6e..c0efe6d404ac86a6abd14c16f9cc2deb55b3953a 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2016-11-07  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+       PR middle-end/35691
+       * gcc.dg/pr35691-1.c: New test-case.
+       * gcc.dg/pr35691-2.c: Likewise.
+
 2016-11-07  Bernd Schmidt  <bschmidt@redhat.com>
 
        PR rtl-optimization/77309

diff --git a/gcc/testsuite/gcc.dg/pr35691-1.c b/gcc/testsuite/gcc.dg/pr35691-1.c
new file mode 100644 (file)
index 0000000..5211f81
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr35691-1.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-forwprop-details" } */
+
+int foo(int z0, unsigned z1)
+{
+  int t0 = (z0 == 0);
+  int t1 = (z1 == 0);
+  int t2 = (t0 && t1);
+  return t2;
+}
+
+/* { dg-final { scan-tree-dump "gimple_simplified to _\[0-9\]* = \\(int\\) z1_\[0-9\]*\\(D\\);" "forwprop1" } } */

diff --git a/gcc/testsuite/gcc.dg/pr35691-2.c b/gcc/testsuite/gcc.dg/pr35691-2.c
new file mode 100644 (file)
index 0000000..90cbf6d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr35691-2.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -fdump-tree-forwprop-details" } */
+
+int foo(int z0, unsigned z1)
+{
+  int t0 = (z0 != 0);
+  int t1 = (z1 != 0);
+  int t2 = (t0 || t1);
+  return t2;
+}
+
+/* { dg-final { scan-tree-dump "gimple_simplified to _\[0-9\]* = \\(int\\) z1_\[0-9\]*\\(D\\);" "forwprop1" } } */