[Bug target/24036] [e500] ICE in subreg_offset_representable_p, at rtlanal.c:3143

[jsm28 at gcc dot gnu dot org]

------- Comment #6 from jsm28 at gcc dot gnu dot org  2006-11-23 00:16 -------
Patch was discussed at
http://gcc.gnu.org/ml/gcc-patches/2006-08/msg00451.html
and had some objections from Geoff Keating.

I've come across another problem case and am testing another possible patch to
address both cases.  If you take an SImode subreg of a DFmode register, offset
4, that is the low word of the register and so is representable and
subreg_regno_offset should return 0.  But the conversion to integer units means
that it acts like taking an SImode subreg of a DImode value (and so returns 1,
taking the wrong register).  I think the conversion to integer units is simply
wrong in these cases.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |jsm28 at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24036