[Bug rtl-optimization/51447] [4.7 Regression] global register variable definition incorrectly removed as dead code

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51447

--- Comment #20 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Matthijs Kooijman from comment #19)
> Regarding the bug description that says "4.7 regression", I have also
> observed this bug on avr-gcc 4.3.3, so it's not a regression introduced in
> 4.7.

That is just because no compilers older than 4.7.0 are supported any longer.
The [... Regression] markers only show list of still affected supported
compiler versions, if it is a regression from any of the older compilers.