[Bug optimization/13514] New: [3.3 regression] unable to find a register to spill

["debian-gcc at lists dot debian dot org" <gcc-bugzilla at gcc dot gnu dot org>]

[forwarded from http://bugs.debian.org/224576]

seen with today's 3.3.3, works fine with 3.2.3 and CVS HEAD.

$ gcc -O2 -Wall -c bug-224576.i 
parse.c: In function `op_assign':
parse.c:473: error: unable to find a register to spill in class `Q_REGS'
parse.c:473: error: this is the insn:
(insn:HI 273 653 274 17 0x4043a688 (set (mem:QI (plus:SI (subreg:SI (reg/v:DI 98) 0)
                (subreg:SI (reg/v:DI 85) 0)) [0 S1 A8])
        (subreg:QI (reg/v:DI 72) 0)) 47 {*movqi_1} (nil)
    (expr_list:REG_DEAD (reg/v:DI 72)
        (expr_list:REG_DEAD (reg/v:DI 98)
            (expr_list:REG_DEAD (reg/v:DI 85)
                (nil)))))
parse.c:473: confused by earlier errors, bailing out

-- 
           Summary: [3.3 regression] unable to find a register to spill
           Product: gcc
           Version: 3.3.3
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: debian-gcc at lists dot debian dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13514