[Bug rtl-optimization/56023] [4.6 Regression]: [alpha] -fcompare-debug failure due to sched1 pass

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56023

--- Comment #8 from Uros Bizjak <ubizjak at gmail dot com> 2013-01-19 10:17:43 UTC ---
The scheduler passes block boundary here and schedules insns from the next
block. This is the difference to the compilation w/o -g and to gcc-4_7 branch.

;;   ======================================================
;;   -- basic block 10 from 99 to 102 -- before reload
;;   ======================================================

;;   --------------- forward dependences: ------------ 

;;   --- Region Dependences --- b 10 bb 5 
;;      insn  code    bb   dep  prio  cost   reservation
;;      ----  ----    --   ---  ----  ----   -----------
;;       99    -1    10     0     0     0   nothing    : 43 100 
;;      100    -1    10     1     0     0   nothing    : 
;;      102   184    10     0     2     2   (ev4_ib1+ev4_bbox),ev4_bbox    : 44 


;;   --- Region Dependences --- b 4 bb 6 
;;      insn  code    bb   dep  prio  cost   reservation
;;      ----  ----    --   ---  ----  ----   -----------
;;       29    52     4     0     9     2   (ev4_ib0+ev4_ebox)    : 44 30 
;;       30   159     4     1     7     2   (ev4_ib0+ev4_ebox)    : 44 31 
;;       31   159     4     1     5     2   (ev4_ib0+ev4_ebox)    : 44 39 
;;       35   159     4     0     5     2   (ev4_ib0+ev4_ebox)    : 44 39 
;;       37 NOTE_INSN_DELETED
;;       38 NOTE_INSN_DELETED
;;       39    41     4     2     3     2   (ev4_ib0+ev4_ebox)    : 44 
;;       40 NOTE_INSN_DELETED
;;       41     3     4     0     2     2   (ev4_ib0+ev4_ebox)    : 44 
;;       42 NOTE_INSN_DELETED
;;       43     3     4     0     2     2   (ev4_ib0+ev4_ebox)    : 44 
;;       44   184     4     8     2     2   (ev4_ib1+ev4_bbox),ev4_bbox    : 

;;        dependencies resolved: insn 99
;;        tick updated: insn 99 into ready
;;        dependencies resolved: insn 102
;;        Ready-->Q: insn 102: queued for 2 cycles.
;;        tick updated: insn 102 into queue with cost=2
;;        dependencies resolved: insn 29/b6
;;        Ready-->Q: insn 29/b6: queued for 2 cycles.
;;        tick updated: insn 29/b6 into queue with cost=2
;;        dependencies resolved: insn 35/b6
;;        Ready-->Q: insn 35/b6: queued for 2 cycles.
;;        tick updated: insn 35/b6 into queue with cost=2
;;        dependencies resolved: insn 41/b6
;;        Ready-->Q: insn 41/b6: queued for 2 cycles.
;;        tick updated: insn 41/b6 into queue with cost=2
;;        dependencies resolved: insn 43/b6
;;        Ready-->Q: insn 43/b6: queued for 2 cycles.
;;        tick updated: insn 43/b6 into queue with cost=2
;;    Advanced a state.
;;      ...