------- Comment #5 from hp at gcc dot gnu dot org 2008-10-22 22:17 -------
Created an attachment (id=16531)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16531&action=view)
Reduced test-case for updated cris.h at r141228. Compile with -O2.
After fixing REGNO_REG_CLASS (but still with the singleton version of
IRA_COVER_CLASSES), see the cris.h patch, I still get an ICE in IRA, during
build, compiling ldtoa.c from newlib:
dtoa2.c: In function 'emovo':
ldtoa2.c:24: error: unrecognizable insn:
(insn 144 57 140 4 ldtoa2.c:12 (set (reg:HI 13 r13)
(mem:HI (post_inc:SI (reg/v/f:SI 15 acr [orig:63 p.37 ] [63])) [2 S2
A8])) -1 (expr_list:REG_INC (reg/v/f:SI 15\
acr [orig:63 p.37 ] [63])
(nil)))
ldtoa2.c:24: internal compiler error: in extract_insn, at recog.c:2027
The last dump file is from IRA. It appears IRA (or reload) allocates ACR (reg
15) for an address with post-increment. It's just that this register can't be
used for that addressing mode - which is one of the reasons it's in a separate
class. This doesn't happen with the non-singleton IRA_COVER_CLASSES.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37813
