[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]

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)))))))))