[gcc r13-3433] Add 'gcc.dg/tree-ssa/pr107195-3.c' [PR107195]

[Thomas Schwinge <tschwinge@gcc.gnu.org>]

https://gcc.gnu.org/g:436c4a210e8ff936063579dab3641632c06c8a7d

commit r13-3433-g436c4a210e8ff936063579dab3641632c06c8a7d
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Mon Oct 17 09:10:03 2022 +0200

    Add 'gcc.dg/tree-ssa/pr107195-3.c' [PR107195]
    
    ... to display optimization performed as of recent
    commit r13-3217-gc4d15dddf6b9eacb36f535807ad2ee364af46e04
    "[PR107195] Set range to zero when nonzero mask is 0".
    
            PR tree-optimization/107195
            gcc/testsuite/
            * gcc.dg/tree-ssa/pr107195-3.c: New.

Diff:
---
 gcc/testsuite/gcc.dg/tree-ssa/pr107195-3.c | 112 +++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr107195-3.c b/gcc/testsuite/gcc.dg/tree-ssa/pr107195-3.c
new file mode 100644
index 00000000000..eba4218b3c9
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr107195-3.c
@@ -0,0 +1,112 @@
+/* Inspired by 'libgomp.oacc-c-c++-common/nvptx-sese-1.c'.  */
+
+/* { dg-additional-options -O1 } */
+/* { dg-additional-options -fdump-tree-dom3-raw } */
+
+
+extern int
+__attribute__((const))
+foo1 (int);
+
+int f1 (int r)
+{
+  if (foo1 (r)) /* If this first 'if' holds...  */
+    r *= 2; /* ..., 'r' now has a zero-value lower-most bit...  */
+
+  if (r & 1) /* ..., so this second 'if' can never hold...  */
+    { /* ..., so this is unreachable.  */
+      /* In constrast, if the first 'if' does not hold ('foo1 (r) == 0'), the
+	 second 'if' may hold, but we know ('foo1' being 'const') that
+	 'foo1 (r) == 0', so don't have to re-evaluate it here: */
+      r += foo1 (r);
+    }
+
+  return r;
+}
+/* Thus, if optimizing, we only ever expect one call of 'foo1'.
+   { dg-final { scan-tree-dump-times {gimple_call <foo1,} 1 dom3 } } */
+
+
+extern int
+__attribute__((const))
+foo2 (int);
+
+int f2 (int r)
+{
+  if (foo2 (r))
+    r *= 8;
+
+  if (r & 7)
+    r += foo2 (r);
+
+  return r;
+}
+/* { dg-final { scan-tree-dump-times {gimple_call <foo2,} 1 dom3 } } */
+
+
+extern int
+__attribute__((const))
+foo3 (int);
+
+int f3 (int r)
+{
+  if (foo3 (r))
+    r <<= 4;
+
+  if ((r & 64) && ((r & 8) || (r & 4) || (r & 2) || (r & 1)))
+    r += foo3 (r);
+
+  return r;
+}
+/* { dg-final { scan-tree-dump-times {gimple_call <foo3,} 1 dom3 } } */
+
+
+extern int
+__attribute__((const))
+foo4 (int);
+
+int f4 (int r)
+{
+  if (foo4 (r))
+    r *= 8;
+
+  if ((r >> 1) & 2)
+    r += foo4 (r);
+
+  return r;
+}
+/* { dg-final { scan-tree-dump-times {gimple_call <foo4,} 1 dom3 } } */
+
+
+extern int
+__attribute__((const))
+foo5 (int);
+
+int f5 (int r) /* Works for both 'signed' and 'unsigned'.  */
+{
+  if (foo5 (r))
+    r *= 2;
+
+  if ((r % 2) != 0)
+    r += foo5 (r);
+
+  return r;
+}
+/* { dg-final { scan-tree-dump-times {gimple_call <foo5,} 1 dom3 } } */
+
+
+extern int
+__attribute__((const))
+foo6 (int);
+
+int f6 (unsigned int r) /* 'unsigned' is important here.  */
+{
+  if (foo6 (r))
+    r *= 2;
+
+  if ((r % 2) == 1)
+    r += foo6 (r);
+
+  return r;
+}
+/* { dg-final { scan-tree-dump-times {gimple_call <foo6,} 1 dom3 } } */