[Bug middle-end/57896] [4.8 Regression] ICE in expand_expr_real_2

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57896

--- Comment #17 from Uroš Bizjak <ubizjak at gmail dot com> ---
Somehow we get old_size = 0 in gen_reg_rtx. It is calculated as:

      int old_size = crtl->emit.regno_pointer_align_length;

Trivial patch that prevents this situation and fixes the problem. However, it
is not clear to me if crtl->emit.regno_pointer_align_length should start larger
than zero.

--cut here--
Index: emit-rtl.c
===================================================================
--- emit-rtl.c  (revision 207935)
+++ emit-rtl.c  (working copy)
@@ -903,6 +903,8 @@ gen_reg_rtx (enum machine_mode mode)
       char *tmp;
       rtx *new1;

+      if (old_size < 1)
+       old_size = 1;
       tmp = XRESIZEVEC (char, crtl->emit.regno_pointer_align, old_size * 2);
       memset (tmp + old_size, 0, old_size);
       crtl->emit.regno_pointer_align = (unsigned char *) tmp;
--cut here--