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Fixed floating point in Mac OS X ppc

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This commit is contained in:
Clifford T. Matthews 2009-06-17 18:29:59 -06:00
parent 19e4e464ed
commit ffb371a163
3 changed files with 34 additions and 17 deletions
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4
README
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@ -71,9 +71,7 @@ the SDL-based version of Executor on Mac OS X Intel, you can try:
make
If you have SDL installed and would like to play with the SDL-based
version of Executor on Mac OS X PPC, you can try the following. Be aware that
the Mac OS X PPC port is the most recent port and is likely to have problems
above and beyond those of the other ports.
version of Executor on Mac OS X PPC, you can try the following.
mkdir -p build/debug-macosx-sdl
cd build/debug-macosx-sdl

4
TODO
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@ -1,7 +1,3 @@
Look into Mac OS X PPC glitches
cards don't work right in Eric's Ultimate Solitaire demo
Yank all the misleading RCS strings
Update the copyright notices to make it that the code is under

43
src/include/rsys/floatconv.h
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@ -23,14 +23,38 @@
#include <string.h>
#include "rsys/float.h"
/*
* Unlike most of the rest of Executor's source, we're not using __ppc__
* in our tests below, because the code involved won't compile on Mac OS X
* 10.5.7, with gcc 4.0.1.
*/
#if defined (powerpc)
#include <ieee754.h>
#elif defined (__ppc__)
/*
* This comes from gcc's ieee754.h,
* which does not come with gcc with Apple's XCode.
*/
union ieee754_double
{
long double d;
struct {
unsigned int negative:1;
unsigned int exponent:11;
/* Together these comprise the mantissa. */
unsigned int mantissa0:20;
unsigned int mantissa1:32;
} ieee;
struct {
unsigned int negative:1;
unsigned int exponent:11;
unsigned int quiet_nan:1;
/* Together these comprise the mantissa. */
unsigned int mantissa0:19;
unsigned int mantissa1:32;
} ieee_nan;
};
#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
#endif
@ -92,7 +116,7 @@ x80_to_ieee (const x80_t *x)
}
retval = *(double *)&temp64;
#elif defined (powerpc)
#elif defined (powerpc) || defined (__ppc__)
union ieee754_double d;
long long f; /* see SANE 2-18 for names */
@ -103,7 +127,7 @@ x80_to_ieee (const x80_t *x)
s = GET_X80_SGN (x);
e = GET_X80_EXP (x);
i = x->man.man >> 63;
f = x->man.man & 0x7fffffffffffffff;
f = x->man.man & 0x7fffffffffffffffULL;
if (e == 32767)
{
@ -163,7 +187,6 @@ x80_to_ieee (const x80_t *x)
}
#warning using 8 byte to represent x80; precision will be lost
retval = d.d;
#else
# warning x80_to_ieee not yet supported on this architecture.
#endif
@ -330,7 +353,7 @@ ieee_to_x80 (ieee_t n, x80_t *x)
templ = temp64p->man_lo;
x->man.hilo.man_hi = CL(0x80000000 | ((temp64p->man_hi) << 11) | (templ >> 21));
x->man.hilo.man_lo = CL(templ << 11);
#elif defined (powerpc)
#elif defined (powerpc) || defined (__ppc__)
union ieee754_double d;
d.d = n;