$ sparc-rtems-gcc -v
Using built-in specs.
Target: sparc-rtems4.7
Configured with: ../gcc-4.1.1/configure --prefix=/opt/rtems-4.7 --bindir=/opt/rtems-4.7/bin --includedir=/opt/rtems-4.7/include --libdir=/opt/rtems-4.7/lib --libexecdir=/opt/rtems-4.7/lib --mandir=/opt/rtems-4.7/man --infodir=/opt/rtems-4.7/info --datadir=/opt/rtems-4.7/share --build=i686-suse-linux-gnu --host=i686-suse-linux-gnu --target=sparc-rtems4.7 --with-gnu-as --with-gnu-ld --verbose --with-newlib --with-system-zlib --disable-nls --without-included-gettext --disable-win32-registry --enable-version-specific-runtime-libs --enable-threads --enable-languages=c,c++
Thread model: rtems
gcc version 4.1.1 (RTEMS gcc-4.1.1/newlib-1.15.0-9.suse10.2)


$ cat float.c
float square(float x)
{
  return x * x;
}


$ sparc-rtems-gcc -mcpu=cypress -c float.c
$ sparc-rtems-objdump -d float.o

float.o:     file format elf32-sparc

Disassembly of section .text:

00000000 <square>:
   0:   9d e3 bf 98     save  %sp, -104, %sp
   4:   f0 27 a0 44     st  %i0, [ %fp + 0x44 ]
   8:   d3 07 a0 44     ld  [ %fp + 0x44 ], %f9
   c:   d1 07 a0 44     ld  [ %fp + 0x44 ], %f8
  10:   91 a2 49 28     fmuls  %f9, %f8, %f8
  14:   81 a0 00 28     fmovs  %f8, %f0
  18:   81 e8 00 00     restore
  1c:   81 c3 e0 08     retl
  20:   01 00 00 00     nop


$ sparc-rtems-gcc -mcpu=cypress -mfpu -c float.c
$ sparc-rtems-objdump -d float.o

float.o:     file format elf32-sparc

Disassembly of section .text:

00000000 <square>:
   0:   9d e3 bf 98     save  %sp, -104, %sp
   4:   f0 27 a0 44     st  %i0, [ %fp + 0x44 ]
   8:   d0 07 a0 44     ld  [ %fp + 0x44 ], %o0
   c:   d2 07 a0 44     ld  [ %fp + 0x44 ], %o1
  10:   40 00 00 00     call  10 <square+0x10>
  14:   01 00 00 00     nop
  18:   82 10 00 08     mov  %o0, %g1
  1c:   b0 10 00 01     mov  %g1, %i0
  20:   81 e8 00 00     restore
  24:   81 c3 e0 08     retl
  28:   01 00 00 00     nop


$ sparc-rtems-gcc -mcpu=cypress -mhard-float -c float.c
$ sparc-rtems-objdump -d float.o

float.o:     file format elf32-sparc

Disassembly of section .text:

00000000 <square>:
   0:   9d e3 bf 98     save  %sp, -104, %sp
   4:   f0 27 a0 44     st  %i0, [ %fp + 0x44 ]
   8:   d0 07 a0 44     ld  [ %fp + 0x44 ], %o0
   c:   d2 07 a0 44     ld  [ %fp + 0x44 ], %o1
  10:   40 00 00 00     call  10 <square+0x10>
  14:   01 00 00 00     nop
  18:   82 10 00 08     mov  %o0, %g1
  1c:   b0 10 00 01     mov  %g1, %i0
  20:   81 e8 00 00     restore
  24:   81 c3 e0 08     retl
  28:   01 00 00 00     nop


$ sparc-rtems-gcc -mcpu=cypress -mhard-quad-float -c float.c
$ sparc-rtems-objdump -d float.o

float.o:     file format elf32-sparc

Disassembly of section .text:

00000000 <square>:
   0:   9d e3 bf 98     save  %sp, -104, %sp
   4:   f0 27 a0 44     st  %i0, [ %fp + 0x44 ]
   8:   d3 07 a0 44     ld  [ %fp + 0x44 ], %f9
   c:   d1 07 a0 44     ld  [ %fp + 0x44 ], %f8
  10:   91 a2 49 28     fmuls  %f9, %f8, %f8
  14:   81 a0 00 28     fmovs  %f8, %f0
  18:   81 e8 00 00     restore
  1c:   81 c3 e0 08     retl
  20:   01 00 00 00     nop