[PATCH] Fix ab SSA_NAME handling in eipa_sra replace_removed_params_ssa_names (PR tree-optimization/70152)

[Richard Biener]

On March 9, 2016 6:02:26 PM GMT+01:00, Jakub Jelinek <jakub@redhat.com> wrote:
>Hi!
>
>If a parameter is unused, eipa_sra replaces the SSA_NAMEs with that
>PARM_DECL SSA_NAME_VAR with SSA_NAMEs with a VAR_DECL instead.
>IMHO it is fine to do that even when all or some of its SSA_NAMEs
>are (ab), but we need to copy that flag over.
>
>Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

OK.

Richard.

>2016-03-09  Jakub Jelinek  <jakub@redhat.com>
>
>	PR tree-optimization/70152
>	* tree-sra.c (replace_removed_params_ssa_names): Copy over
>	SSA_NAME_OCCURS_IN_ABNORMAL_PHI from old_name to new_name.
>
>	* gcc.dg/pr70152.c: New test.
>
>--- gcc/tree-sra.c.jj	2016-02-26 20:30:21.000000000 +0100
>+++ gcc/tree-sra.c	2016-03-09 10:55:23.628924709 +0100
>@@ -4758,6 +4758,8 @@ replace_removed_params_ssa_names (tree o
> 
>   repl = get_replaced_param_substitute (adj);
>   new_name = make_ssa_name (repl, stmt);
>+  SSA_NAME_OCCURS_IN_ABNORMAL_PHI (new_name)
>+    = SSA_NAME_OCCURS_IN_ABNORMAL_PHI (old_name);
> 
>   if (dump_file)
>     {
>--- gcc/testsuite/gcc.dg/pr70152.c.jj	2016-03-09 11:04:33.704398525
>+0100
>+++ gcc/testsuite/gcc.dg/pr70152.c	2016-03-09 11:04:51.815150732 +0100
>@@ -0,0 +1,27 @@
>+/* PR tree-optimization/70152 */
>+/* { dg-do compile } */
>+/* { dg-options "-O2" } */
>+
>+int a;
>+int foo (void);
>+int setjmp (char *);
>+char buf[64];
>+
>+static int
>+bar (int x)
>+{
>+  x = 0;
>+  setjmp (buf);
>+  for (;;)
>+    {
>+    switch (x)
>+      case 5:
>+	x = foo ();
>+    }
>+}
>+
>+void
>+baz (void)
>+{
>+  bar (a);
>+}
>
>	Jakub