[Bug middle-end/55889] [4.8 Regression] ICE: in move_op_ascend, at sel-sched.c:6153 with -fschedule-insns -fselective-scheduling

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55889

--- Comment #4 from David Edelsohn <dje at gcc dot gnu.org> 2013-01-09 02:52:51 UTC ---
Selective scheduling is failing for one of the new AIX TLS instructions when
encountered for that testcase. The necessary options are:

-O -fschedule-insns -fselective-scheduling -fpic -fprofile-generate

moveup_expr_cached() is called with expr->vinsn->insn_rtx of:

(insn 145 0 0 (set (reg:SI 192)
        (mem/u/c:SI (unspec:SI [
                    (symbol_ref:SI ("*LCM..2") [flags 0x2])
                    (reg:SI 2 2)
                ] UNSPEC_TOCREL) [0 S4 A8])) 346 {*movsi_internal1}
     (nil))

and insn

(insn 17 16 20 2 (parallel [
            (set (reg:SI 3 3)
                (unspec:SI [
                        (reg:SI 3 3)
                        (reg:SI 4 4)
                    ] UNSPEC_TLSTLS))
            (clobber (reg:SI 0 0))
            (clobber (reg:SI 4 4))
            (clobber (reg:SI 5 5))
            (clobber (reg:SI 11 11))
            (clobber (reg:CC 68 0))
            (clobber (reg:SI 65 lr))
        ]) /nasfarm/dje/src/src/gcc/testsuite/gcc.dg/tree-prof/pr50907.c:5 443
{tls_get_addr_internalsi}
     (expr_list:REG_DEAD (reg:SI 4 4)
        (expr_list:REG_UNUSED (reg:CC 68 0)
            (expr_list:REG_UNUSED (reg:SI 65 lr)
                (expr_list:REG_UNUSED (reg:SI 11 11)
                    (expr_list:REG_UNUSED (reg:SI 5 5)
                        (expr_list:REG_UNUSED (reg:SI 4 4)
                            (expr_list:REG_UNUSED (reg:SI 0 0)
                                (nil)))))))))