[Bug rtl-optimization/46829] New: ICE: in spill_failure, at reload1.c:2105 with -fschedule-insns -fsched-pressure and variadic function

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46829

           Summary: ICE: in spill_failure, at reload1.c:2105 with
                    -fschedule-insns -fsched-pressure and variadic
                    function
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: zso...@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 22663
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22663
reduced testcase

Compiler flags:
gcc -O[123] -fschedule-insns -fsched-pressure

Compiler output:
$ gcc -O -fschedule-insns -fsched-pressure pr46829.c 
pr46829.c: In function 'foo':
pr46829.c:15:1: error: unable to find a register to spill in class 'AREG'
pr46829.c:15:1: error: this is the insn:
(insn 16 21 18 4 (parallel [
            (set (reg:SI 37 r8)
                (div:SI (reg:SI 37 r8 [orig:59 D.2694 ] [59])
                    (reg:SI 38 r9 [orig:60 D.2695 ] [60])))
            (set (reg:SI 1 dx [69])
                (mod:SI (reg:SI 37 r8 [orig:59 D.2694 ] [59])
                    (reg:SI 38 r9 [orig:60 D.2695 ] [60])))
            (clobber (reg:CC 17 flags))
        ]) pr46829.c:14 353 {*divmodsi4}
     (expr_list:REG_DEAD (reg:SI 37 r8 [orig:59 D.2694 ] [59])
        (expr_list:REG_UNUSED (reg:SI 1 dx [69])
            (expr_list:REG_UNUSED (reg:CC 17 flags)
                (nil)))))
pr46829.c:15:1: internal compiler error: in spill_failure, at reload1.c:2105
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r167471 - crash
4.5.1 - crash