i386-mingw32-gcc can't find register in class FP_TOP_REG

[Bernd Jendrissek]

Hi

I have a compiler error at -O2 that goes away at -O0:

/mnt/disk2/src/mingw/mingw-runtime-3.0/mingwex: PATH=/usr/cross/bin:$PATH i386-mingw32-gcc -c  -g -O2   -fomit-frame-pointer -I ./../../w32api/include -I. -I./../include -nostdinc -nostdinc++ -iwithprefixbefore include -da ./math/pow.c -o pow.o
math/pow.c: In function `pow':
../include/math.h:174: error: can't find a register in class `FP_TOP_REG' while reloading `asm'

Here's that part of the header:

#if !defined (__NO_INLINES__)
extern __inline__ __cdecl double fabs (double x)
{
  double res;
  __asm__ ("fabs;" : "=t" (res) : "0" (x));
  return res;
}
#endif

/usr/src/home: cat /mnt/disk2/src/gcc/LAST_UPDATED 
Tue May 13 17:39:22 SAST 2003
Tue May 13 15:39:22 UTC 2003

Unfortunately I don't know what do do with all those -da output files.

But I do have a testcase derived from the mingw-runtime and w32-api sources
(attached).

-- 
bernd.jendrissek@mailbox.co.za is probably better to bookmark than any
employer-specific email address I may have appearing in the headers.
-------------- next part --------------
/* Run like so:
   /usr/cross/bin/i386-mingw32-gcc -c -O2 -Wall powcrash.c -o powcrash.o
 */

# ifndef _CRTIMP
#  define _CRTIMP  __declspec(dllimport)
# endif
# ifndef __cdecl
#  define __cdecl __attribute__((cdecl))
# endif

_CRTIMP double __cdecl floor (double);
_CRTIMP double __cdecl fabs (double);
extern __inline__ __cdecl double fabs (double x)
{
	double res;
	__asm__ ("fabs;" : "=t" (res) : "0" (x));
	return res;
}

double pow(double x, double y)
{
	double ya;
	double yb;
	int yoddint;

	yoddint = 0;
	/* Test for odd integer y.  */
	ya = floor(0.5);
	yb = 0.5 * fabs(0.0);
	if( ya != yb )
		yoddint = 1;

	if( y < 0.0 ) {
		if( yoddint )
			return( 0.0 );
	}

	return( 0.0 );
}