[Bug c/17241] New: sh4 application SIGSEGV's with gcc-3.3.4 -O2

["gp at qnx dot com" <gcc-bugzilla at gcc dot gnu dot org>]

A test case (src from libmad) SIGSEGV's when compiled with -O2.  It runs with -
O0.  It has the same behavior with gcc-3.3.1, gcc-3.3.3, and gcc-3.3.4 
targetting sh-unknown-nto-qnx6.3.0.  It looks like an sh optimization issue, 
and not qnx specific.

Command line (generates no errors or warnings):
sh-unknown-nto-qnx-6.3.0-gcc-3.3.4 bug.c -obug -ml -O2

The pre-processed source is large, as any changes I made to the original 
source made the SIGSEGV stop happening.

gdb output:
Program received signal SIGSEGV, Segmentation fault.
0x080409e4 in dct32 (in=0x8e4, slot=0, lo=0x803da64, hi=0xfffffff4) 
at /tmp/gccbug/bug.c:167
167       t86  = t65 + t66;  t109 = MUL(t65 - t66, costab20);
(gdb) bt
#0  0x080409e4 in dct32 (in=0x8e4, slot=0, lo=0x803da64, hi=0xfffffff4) 
at /tmp/
gccbug/bug.c:167
#1  0x080411b4 in main (argc=2276, argv=0x0) at /tmp/gccbug/bug.c:427
(gdb)

-- 
           Summary: sh4 application SIGSEGV's with gcc-3.3.4 -O2
           Product: gcc
           Version: 3.3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: gp at qnx dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i386-pc-nto-qnx6.3.0
  GCC host triplet: i386-pc-nto-qnx6.3.0
GCC target triplet: sh-unknown-nto-qnx6.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17241