GCC Bugzilla Bug 24894

GCC head as of 16 Nov with newlib 1.13.0.  Configured as follows:

../gcc-head-test/configure --target=avr-rtems4.7 --enable-threads=rtems
--prefix=/home/joel/gcc-41-test/ --with-gnu-as --with-gnu-ld --with-newlib
--verbose --with-system-zlib --disable-nls
--enable-version-specific-runtime-libs --enable-languages=c

Fails with this:

home/joel/gcc-work/head/b-avr-rtems4.7/./gcc/xgcc
-B/home/joel/gcc-work/head/b-avr-rtems4.7/./gcc/ -nostdinc
-B/home/joel/gcc-work/head/b-avr-rtems4.7/avr-rtems4.7/avr3/newlib/ -isystem
/home/joel/gcc-work/head/b-avr-rtems4.7/avr-rtems4.7/avr3/newlib/targ-include
-isystem /home/joel/gcc-work/head/gcc-head-test/newlib/libc/include
-B/home/joel/gcc-41-test//avr-rtems4.7/bin/
-B/home/joel/gcc-41-test//avr-rtems4.7/lib/ -isystem
/home/joel/gcc-41-test//avr-rtems4.7/include -isystem
/home/joel/gcc-41-test//avr-rtems4.7/sys-include  -mmcu=avr3
-DPACKAGE=\"newlib\" -DVERSION=\"1.13.0\"  -I.
-I../../../../../../gcc-head-test/newlib/libc/misc  -Os
-DPREFER_SIZE_OVER_SPEED -mcall-prologues -DHAVE_GETTIMEOFDAY -DMALLOC_PROVIDED
-DEXIT_PROVIDED -DMISSING_SYSCALL_NAMES -DSIGNAL_PROVIDED
-DREENTRANT_SYSCALLS_PROVIDED -DHAVE_OPENDIR -DNO_EXEC -DHAVE_FCNTL
-fno-builtin      -O2 -g -O2   -mmcu=avr3 -c
../../../../../../gcc-head-test/newlib/libc/misc/init.c
../../../../../../gcc-head-test/newlib/libc/misc/init.c: In function
'__libc_fini_array':  
../../../../../../gcc-head-test/newlib/libc/misc/init.c:59: error: unable to
find a register to spill in class 'BASE_POINTER_REGS'
../../../../../../gcc-head-test/newlib/libc/misc/init.c:59: error: this is the
insn:
(insn 64 31 32 2 ../../../../../../gcc-head-test/newlib/libc/misc/init.c:56
(set (mem/c:HI (plus:HI (reg/f:HI 28 r28)
                (const_int 1 [0x1])) [5 S2 A8])
        (reg:HI 24 r24)) 12 {*movhi} (nil)
    (nil))
../../../../../../gcc-head-test/newlib/libc/misc/init.c:59: internal compiler
error: in spill_failure, at reload1.c:1890

Preprocessed output attached

Created an attachment (id=10252) [edit]
Preprocessed file that produces ICE

This is the preprocessed output of the file causing the ICE.

I think this is related to PR 19636.

PR 19636 fails only when compiled with -Os, while
this one fails only when compiled with -O2 or -O3.

This looks like a duplicate of bug #31786. Closing this bug as #31786 has more
analysis in the comments and is confirmed.

*** This bug has been marked as a duplicate of 31786 ***

Subject: Bug 24894

Author: aesok
Date: Sun Sep 14 12:50:10 2008
New Revision: 140360

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=140360
Log:
        PR target/19636
        PR target/24894
        PR target/31644
        PR target/31786
        * config/avr/avr.c (legitimate_address_p): Fix problem where subreg
        is not recognized as a valid register usage. Allow REG_X to be used
        as a base pointer.
        * config/avr/avr.h (LEGITIMIZE_RELOAD_ADDRESS): Remove code that
        forces a reload when using a base register.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/avr/avr.c
    trunk/gcc/config/avr/avr.h