[Bug classpath/22800] ARM double to ascii conversion issue

[ton at sagemdenmark dot dk]

------- Additional Comments From ton at sagemdenmark dot dk  2005-09-20 08:57 
-------
In ./native/fdlibm/mprec.h I found the following macro definition:

   /* The following definition of Storeinc is appropriate for MIPS processors.
    * An alternative that might be better on some machines is
    * #define Storeinc(a,b,c) (*a++ = b << 16 | c & 0xffff)
    */
   #if defined(IEEE_8087) + defined(VAX) 
   #define Storeinc(a,b,c) (((unsigned short *)a)[1] = (unsigned short)b, \
   ((unsigned short *)a)[0] = (unsigned short)c, a++)
   #else
   #define Storeinc(a,b,c) (((unsigned short *)a)[0] = (unsigned short)b, \
   ((unsigned short *)a)[1] = (unsigned short)c, a++)
   #endif

It seems that the else branch is selected when gcc is configured like this:

   Using built-in specs.
   Target: arm-elf
   Configured with: ../gcc-4.0.1/configure --prefix=/home/ton/eft2/installdir
--target=arm-elf --with-float=soft --enable-languages=c --enable-threads=posix
   Thread model: posix
   gcc version 4.0.1


When running this code:

    _dtoa(-123.4567, 22, 10, &dec, &sgn, &pp, buf, 1);
    printf("_dtoa: '%s' %d %d\n",buf,dec,sgn);

I get this result:

    _dtoa: '234566006' 3 1

However, when I hack the StoreInc macro to use the code from the if branch, I
get:

   _dtoa: '1234567' 3 1


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22800