[Bug middle-end/18718] [4.0 Regression] ICE: Segmentation fault in in schedule_region (rgn=0) at sched-rgn.c:2325

[amodra at bigpond dot net dot au]

------- Additional Comments From amodra at bigpond dot net dot au  2004-11-30 03:25 -------
Obviously, the loop expects REG_SAVE_NOTEs in pairs, which it isn't getting,
hence the segfault.

This is because the function that adds these notes, sched_analyze, is being
called on basic blocks, and the NOTE_INSN_LOOP_BEG/END pair isn't in the same
basic block.  Smell like bit rot.

;; End of basic block 2, registers live:
 1 [1] 31 [31] 67 [ap] 123 124

(note:HI 48 22 23 NOTE_INSN_LOOP_BEG)

;; Start of basic block 3, registers live: 1 [1] 31 [31] 67 [ap] 123 124
(code_label:HI 23 48 24 3 4 "" [1 uses])

[snip]

;; Start of basic block 4, registers live: 1 [1] 31 [31] 67 [ap] 122 124
[snip]

(note:HI 49 34 63 4 NOTE_INSN_LOOP_END)

[snip]


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18718