[Bug target/63752] New: avr ICE at reload1.c:2128 building newlib

[joel at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63752

            Bug ID: 63752
           Summary: avr ICE at reload1.c:2128 building newlib
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: joel at gcc dot gnu.org

Created attachment 33895
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33895&action=edit
Preprocessed newlib/libc/stdlib/mprec.c which generates the ICE

xgcc (GCC) 5.0.0 20141104 (experimental)

Bug triggered at -O2 and -0Os but not at -O0 or -O1.

/users/joel/test-gcc/b-avr-rtems4.11-gcc/./gcc/xgcc
-B/users/joel/test-gcc/b-avr-rtems4.11-gcc/./gcc/ -march=avr2 -O2 -c avr_bug.c



/users/joel/test-gcc/b-avr-rtems4.11-gcc/./gcc/xgcc
-B/users/joel/test-gcc/b-avr-rtems4.11-gcc/./gcc/ -nostdinc
-B/users/joel/test-gcc/b-avr-rtems4.11-gcc/avr-rtems4.11/avr2/newlib/ -isystem
/users/joel/test-gcc/b-avr-rtems4.11-gcc/avr-rtems4.11/avr2/newlib/targ-include
-isystem /users/joel/test-gcc/gcc/newlib/libc/include
-B/users/joel/test-gcc/install-head/avr-rtems4.11/bin/
-B/users/joel/test-gcc/install-head/avr-rtems4.11/lib/ -isystem
/users/joel/test-gcc/install-head/avr-rtems4.11/include -isystem
/users/joel/test-gcc/install-head/avr-rtems4.11/sys-include  -march=avr2
-DPACKAGE_NAME=\"newlib\" -DPACKAGE_TARNAME=\"newlib\"
-DPACKAGE_VERSION=\"2.1.0\" -DPACKAGE_STRING=\"newlib\ 2.1.0\"
-DPACKAGE_BUGREPORT=\"\" -DPACKAGE_URL=\"\" -I.
-I../../../../../../gcc/newlib/libc/stdlib -Os -DPREFER_SIZE_OVER_SPEED
-mcall-prologues -D_COMPILING_NEWLIB -DMALLOC_PROVIDED -DEXIT_PROVIDED
-DSIGNAL_PROVIDED -DREENTRANT_SYSCALLS_PROVIDED -DHAVE_NANOSLEEP -DHAVE_BLKSIZE
-DHAVE_FCNTL -DHAVE_ASSERT_FUNC -D_NO_GETLOGIN -D_NO_GETPWENT -D_NO_GETUT
-D_NO_GETPASS -D_NO_SIGSET -D_NO_WORDEXP -D_NO_POPEN -D_NO_POSIX_SPAWN
-fno-builtin      -g -O2 -c -o lib_a-mprec.o `test -f 'mprec.c' || echo
'../../../../../../gcc/newlib/libc/stdlib/'`mprec.c
../../../../../../gcc/newlib/libc/stdlib/mprec.c: In function '__multiply':
../../../../../../gcc/newlib/libc/stdlib/mprec.c:419:1: error: unable to find a
register to spill in class 'POINTER_REGS'
 }
 ^
../../../../../../gcc/newlib/libc/stdlib/mprec.c:419:1: error: this is the
insn:
(insn 86 85 88 16 (set (reg:SI 68 [ D.3699 ])
        (mem:SI (post_inc:HI (reg:HI 16 r16 [orig:45 ivtmp.143 ] [45])) [16
MEM[base: _146, offset: 0B]+0 S4 A8]))
../../../../../../gcc/newlib/libc/stdlib/mprec.c:370 94 {*movsi}
     (expr_list:REG_INC (reg:HI 16 r16 [orig:45 ivtmp.143 ] [45])
        (nil)))
../../../../../../gcc/newlib/libc/stdlib/mprec.c:419:1: internal compiler
error: in spill_failure, at reload1.c:2128
0x87df63 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    ../../gcc/gcc/rtl-error.c:110
0x87d7fd spill_failure
    ../../gcc/gcc/reload1.c:2128
0x87d7fd find_reload_regs
    ../../gcc/gcc/reload1.c:2054
0x87d7fd select_reload_regs
    ../../gcc/gcc/reload1.c:2074
0x87d7fd reload(rtx_insn*, int)
    ../../gcc/gcc/reload1.c:1043
0x776eb3 do_reload
    ../../gcc/gcc/ira.c:5392
0x776eb3 execute
    ../../gcc/gcc/ira.c:5542
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [lib_a-mprec.o] Error 1