[Bug target/47898] New: error: unable to find a register to spill in class 'FPUL_REGS'

["mcnichol at austin dot ibm.com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47898

           Summary: error: unable to find a register to spill in class
                    'FPUL_REGS'
           Product: gcc
           Version: 4.3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mcnichol@austin.ibm.com


Created attachment 23472
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23472
Small testcase.

I get the following error when using gcc to cross compile
to an SH4 target.

# /opt/sh4/bin/sh4-linux-gcc -c -O1 sh4-gcc.c 
sh4-gcc.c: In function 'xml_transport_parser':
sh4-gcc.c:104: error: unable to find a register to spill in class 'FPUL_REGS'
sh4-gcc.c:104: error: this is the insn:
(insn 199 198 200 18 sh4-gcc.c:76 (set (mem/s/j:QI (plus:SI (reg:SI 77 fr13
[320])
                (reg:SI 76 fr12 [orig:240 D.2212 ] [240])) [0 name S1 A8])
        (reg:QI 1 r1 [284])) 182 {movqi_i} (expr_list:REG_DEAD (reg:QI 1 r1
[284])
        (expr_list:REG_DEAD (reg:SI 76 fr12 [orig:240 D.2212 ] [240])
            (nil))))
sh4-gcc.c:104: confused by earlier errors, bailing out


The problem only seems to happen with -O1.

Here is the information about my compiler:
#sh4-linux-gcc -v
Using built-in specs.
Target: sh4-linux
Configured with: /usr/src/BUILD/gcc/configure --prefix=/opt/sh4
--target=sh4-linux --with-cpu=sh4a --with-multilib-list=sh4a,sh4a-nofpu
--enable-incomplete-targets --disable-nls --disable-libssp --disable-libgomp
--disable-libmudflap --enable-shared --enable-languages=c,c++ --enable-cross
--enable-__cxa_atexit --enable-threads=posix --with-sysroot=/opt/sh4/crossroot
Thread model: posix
gcc version 4.3.4 [gcc-4_3-branch revision 152973] (GCC)


Attached is a small test case.