[Bug target/53975] [ia64] Target register of a speculative load moved to a branch register prior to the chk.s instruction

[amonakov at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53975

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

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                 CC|                            |abel at gcc dot gnu.org

--- Comment #10 from Alexander Monakov <amonakov at gcc dot gnu.org> 2012-07-19 
17:50:07 UTC ---
AFAICS speculating an assignment to a branch register should be rejected by
sched_insn_is_legitimate_for_speculation_p in sched-deps.c, but it does not
fall into any of the cases tested there.  Consequently, I suppose it's not
specific to sel-sched, just haifa schedules those regions differently and does
not produce those speculative loads.

I wonder how this bug managed to stay latent all these years :)