[Bug rtl-optimization/46441] New: [4.5 Regression] ICE: RTL check: expected code 'reg', have 'plus' in rhs_regno, at rtl.h:1053 with -fsel-sched-pipelining -fselective-scheduling2

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46441

           Summary: [4.5 Regression] ICE: RTL check: expected code 'reg',
                    have 'plus' in rhs_regno, at rtl.h:1053 with
                    -fsel-sched-pipelining -fselective-scheduling2
           Product: gcc
           Version: 4.5.2
            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 22378
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22378
reduced testcase

I come to this ICE often when testing the 4.5 branch. There are several
testcases failing with various flags, but -fsel-sched-pipelining
-fselective-scheduling2 seems to be the common denominator.

Compiler output:
$ gcc -O -fschedule-insns2 -fsel-sched-pipelining -fselective-scheduling2
-fno-tree-loop-optimize testcase.c
testcase.c: In function 'foo':
testcase.c:6:1: internal compiler error: RTL check: expected code 'reg', have
'plus' in rhs_regno, at rtl.h:1053
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r166509 - OK
r163636 - OK
r161659 - crash
4.5 r166509 - crash
4.4 r166509 - OK