[Bug bootstrap/14671] [3.3/3.4 regression] caller-save.c:491: internal compiler error: Segmentation fault

["dave at hiauly1 dot hia dot nrc dot ca" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dave at hiauly1 dot hia dot nrc dot ca  2004-05-27 17:31 -------
Subject: Re:  [3.3/3.4 regression] caller-save.c:491: int

> > I can't duplicate the ICE using the gmp_test4.ii testcase.  What were
> > the compilation options that triggered it?  They are not in the PR.
> > I have tried -O[1-3] with
> 
> Just -O2 -funroll-loops.

I did a new build with the patch below.  With this patch, I still can't
duplicate the ICE:

dave@hiamlx:~/gcc_test> /home/dave/gnu/gcc-3.4/objdir/gcc/g++ -B/home/dave/gnu/gcc-3.4/objdir/gcc/ -S -O2 -funroll-loops gmp_test4.ii
dave@hiamlx:~/gcc_test> /home/dave/gnu/gcc-3.4/objdir/gcc/g++ -B/home/dave/gnu/gcc-3.4/objdir/gcc/ -S -O2 -v                         
Reading specs from /home/dave/gnu/gcc-3.4/objdir/gcc/specs
Configured with: ../gcc/configure --with-gnu-as --with-as=/usr/local/bin/as --with-gnu-ld --with-ld=/usr/local/bin/ld --enable-shared --disable-nls --prefix=/home/dave/opt/gnu/gcc/gcc-3.3.4 --enable-threads=posix --enable-languages=c++ --disable-checking --enable-__cxa_atexit --disable-libunwind-exceptions
Thread model: posix
gcc version 3.3.4 20040526 (prerelease)

I'm retrying with an unmodified tree and the "-O2 -funroll-loops" option.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)

Index: alias.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/alias.c,v
retrieving revision 1.181.2.5
diff -u -3 -p -r1.181.2.5 alias.c
--- alias.c	8 May 2004 21:52:42 -0000	1.181.2.5
+++ alias.c	27 May 2004 17:12:34 -0000
@@ -2786,10 +2786,7 @@ init_alias_analysis ()
   reg_seen = (char *) xmalloc (reg_base_value_size);
   if (! reload_completed && flag_unroll_loops)
     {
-      /* ??? Why are we realloc'ing if we're just going to zero it?  */
-      alias_invariant = (rtx *)xrealloc (alias_invariant,
-					 reg_base_value_size * sizeof (rtx));
-      memset ((char *)alias_invariant, 0, reg_base_value_size * sizeof (rtx));
+      alias_invariant = ggc_calloc (reg_base_value_size, sizeof (rtx));
       alias_invariant_size = reg_base_value_size;
     }
 
@@ -2985,7 +2982,6 @@ end_alias_analysis ()
   reg_base_value_size = 0;
   if (alias_invariant)
     {
-      free (alias_invariant);
       alias_invariant = 0;
       alias_invariant_size = 0;
     }


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14671