[Bug bootstrap/49815] [4.7 regression] ICE in cselib_record_set, at cselib.c:2241 compiling 64-bit libjava on SPARC

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49815

--- Comment #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-07-22 16:41:22 UTC ---
> I meant registers.  Especially with the planned shrink wrapping, say if code
> before the prologue stores some argument into %o5 register that doesn't hold
> any parameter and then prologue does perform a save, that value is now live in
> %i5 rather than %o5 and var-tracking should handle that transparently.

I guess I'll wait and see here, because I don't understand how you can make a
value live through the save insn in the RTL stream if it isn't a parameter.

> Var-tracking should be told that this window save instruction initializes the
> hard frame pointer (%i6 <= %o6) and that %o6 has been decremented, without that
> it is possible it will give wrong answers where values live in.

Do you mean when you put a breakpoint before the save or after the restore?  If
so, I'm not sure the local variables are (still) in scope.  I guess the restore
would also need to be handled then.