bitint: Don't move debug stmts from before returns_twice calls [PR114628]

Debug stmts are allowed by the verifier before the returns_twice calls.
More importantly, they don't have a lhs, so the current handling of
arg_stmts statements to force them on the edges ICEs.

The following patch just keeps them where they were before.

2024-04-09  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/114628
	* gimple-lower-bitint.cc (gimple_lower_bitint): Keep debug stmts
	before returns_twice calls as is, don't push them into arg_stmts
	vector/move to edges.

	* gcc.dg/bitint-105.c: New test.

diff --git a/gcc/gimple-lower-bitint.cc b/gcc/gimple-lower-bitint.cc
index 1afd4de445a32a732bee56ee30f6772e2459c3f4..4c3b7f7b68ed3cebad4565249270c8f06acb3667 100644 (file)
--- a/gcc/gimple-lower-bitint.cc
+++ b/gcc/gimple-lower-bitint.cc
@@ -7172,8 +7172,13 @@ gimple_lower_bitint (void)
          gimple_stmt_iterator gsi = gsi_after_labels (gimple_bb (stmt));
          while (gsi_stmt (gsi) != stmt)
            {
-             arg_stmts.safe_push (gsi_stmt (gsi));
-             gsi_remove (&gsi, false);
+             if (is_gimple_debug (gsi_stmt (gsi)))
+               gsi_next (&gsi);
+             else
+               {
+                 arg_stmts.safe_push (gsi_stmt (gsi));
+                 gsi_remove (&gsi, false);
+               }
            }
          gimple *g;
          basic_block bb = NULL;

diff --git a/gcc/testsuite/gcc.dg/bitint-105.c b/gcc/testsuite/gcc.dg/bitint-105.c
new file mode 100644 (file)
index 0000000..d3215b1
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/bitint-105.c
@@ -0,0 +1,29 @@
+/* PR middle-end/114628 */
+/* { dg-do compile { target bitint } } */
+/* { dg-options "-O2 -g" } */
+
+int foo (int);
+#if __BITINT_MAXWIDTH__ >= 129
+__attribute__((returns_twice)) int bar (_BitInt(129) x);
+
+void
+baz (int x, _BitInt(129) y)
+{
+  void *q[] = { &&l1, &&l2 };
+l2:
+  x = foo (foo (3));
+  bar (y);
+  goto *q[x & 1];
+l1:;
+}
+
+void
+qux (int x, _BitInt(129) y)
+{
+  void *q[] = { &&l1, &&l2 };
+l2:
+  x = foo (foo (3));
+  bar (y);
+l1:;
+}
+#endif