https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48181
Bernhard Kaindl <bernhard.kaindl at thalesgroup dot com> changed:
What |Removed |Added
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CC| |bernhard.kaindl@thalesgroup
| |.com
--- Comment #11 from Bernhard Kaindl <bernhard.kaindl at thalesgroup dot com>
---
Checked what Steven Bosscher said in comment #5 and what I understood from
Comment 6 that LRA fixed this issue:
> FWIW I can't reproduce the problem with trunk. I see rcx being saved
> and restored around the calls, e.g.:
>
> movq %rcx, (%rsp)
> call bar
> movq (%rsp), %rcx
>
> and likewise around the second memcpy. Unfortunately (an old) valgrind
> on gcc17 doesn't work with with "valgrind -q ./a.out" as in comment #0.
> http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192719
> fixed this (so, most likely reproduceable by disabling LRA).
Indeed, gcc-4.8.4 and gcc-4.9.2 save and restore rcx as described,
valgrind-3.10.1 (current release) does not show an error,
and program does not crash at all.
So affected are only gcc-4.5, 4.6 and 4.7,
and only with --param ira-max-conflict-table-size=0 & -fgcse active.
