[Bug target/48061] New: Internal compiler error in spill_failure

[mgretton at sourceware dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48061

           Summary: Internal compiler error in spill_failure
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mgretton@sourceware.org
                CC: ramana.radhakrishnan@arm.com
            Target: arm-none-eabi


Created attachment 23615
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23615
Test case for bug

Compiling the attached test case (based on
gcc/testsuite/gcc.dg/torture/pr47975.c) produces an internal compiler error in
spill_failure.

arm-eabi-gcc -O2 -mfloat-abi=hard -mcpu=cortex-a9 -mfpu=neon test.i produces:

test.c: In function 'foo':
test.c:7:1: error: unable to find a register to spill in class 'GENERAL_REGS'
test.c:7:1: error: this is the insn:
(insn 18 5 6 2 (set (reg:OI 154)
        (const_int 0 [0])) test.c:6 751 {*neon_movoi}
     (expr_list:REG_EQUAL (const_int 0 [0])
        (nil)))
test.c:7:1: internal compiler error: in spill_failure, at reload1.c:2105
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

arm-eabi-gcc -v produces the following output:
Using built-in specs.
COLLECT_GCC=.../bin/arm-eabi-gcc
COLLECT_LTO_WRAPPER=.../bin/../libexec/gcc/arm-eabi/4.6.0/lto-wrapper
Target: arm-eabi
Configured with: .../configure --target=arm-eabi --enable-checking=release
--disable-gdbtk --disable-werror --disable-tui --disable-rda --disable-sid
--disable-utils --disable-lto --with-cpu=cortex-a9 --with-float=softfp
--with-fpu=neon --disable-lto --disable-werror --disable-shared --disable-nls
--disable-threads --disable-tls --enable-checking=yes
--enable-languages=c,c++,fortran --with-newlib
Thread model: single
gcc version 4.6.0 20110309 (experimental) (GCC)