[Bug middle-end/56524] New: Compiler ICE when compiling with -mips16

["sje at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56524

             Bug #: 56524
           Summary: Compiler ICE when compiling with -mips16
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sje@gcc.gnu.org
                CC: aldyh@redhat.com
            Target: mips*-*-*


This test program (from glibc) generates an ICE when compiled with -mips16. 
The internal error we are hitting was part of the fix for pr52555.  The test
program is a bit finicky, I think it is dependent on the order that GCC
processes the functions.  I don't know if this is a bug in the generic code
or in mips specific code and how mips handles the mips16 flag.


% cat mktime.i
unsigned int __bswap_32 (unsigned int __bsx)
{ return __builtin_bswap32 (__bsx); }

#pragma GCC optimize ("wrapv")

inline int leapyear (long long int year)
{
  return
    ((year & 3) == 0
     && (year % 100 != 0
  || ((year / 100) & 3) == (- (1900 / 100) & 3)));
}

mips-mti-linux-gnu-gcc -c -mips16 mktime.i
mktime.i:7:1: internal compiler error: in save_optabs_if_changed, at
optabs.c:6221
 {
 ^
0x8198e5 save_optabs_if_changed(tree_node*)
    /local/home/sellcey/gcc/linux_mips16/src/gcc/gcc/optabs.c:6221
0x4b090b decl_attributes(tree_node**, tree_node*, int)
    /local/home/sellcey/gcc/linux_mips16/src/gcc/gcc/attribs.c:545
0x4cf728 start_function(c_declspecs*, c_declarator*, tree_node*)
    /local/home/sellcey/gcc/linux_mips16/src/gcc/gcc/c/c-decl.c:7727
0x557114 c_common_parse_file()
    /local/home/sellcey/gcc/linux_mips16/src/gcc/gcc/c-family/c-opts.c:1046
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.