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- Implement {make,extract}_extended() for USE_QUAD_DOUBLE

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- Don't forget to fill in mantissa3 member for USE_QUAD_DOUBLE in
  make_extended_*() but make sure NaN, inf, zeros are handled beforehand
This commit is contained in:
gbeauche 2002-09-19 20:52:50 +00:00
parent a5ba7ea5ac
commit d7c677d077
1 changed files with 70 additions and 35 deletions
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105
BasiliskII/src/uae_cpu/fpu/fpu_ieee.cpp
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@ -251,7 +251,34 @@ PRIVATE inline fpu_register FFPU make_extended(uae_u32 wrd1, uae_u32 wrd2, uae_u
return 0.0;
fpu_register result;
#ifndef USE_LONG_DOUBLE
#if USE_QUAD_DOUBLE
// is it NaN?
if ((wrd1 & 0x7fff0000) == 0x7fff0000 && wrd2 != 0 && wrd3 != 0) {
make_nan(result);
return result;
}
// is it inf?
if ((wrd1 & 0x7ffff000) == 0x7fff0000 && wrd2 == 0 && wrd3 == 0) {
if ((wrd1 & 0x80000000) == 0)
make_inf_positive(result);
else
make_inf_negative(result);
return result;
}
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = (wrd2 >> 16) & 0xffff;
srp->ieee.mantissa1 = ((wrd2 & 0xffff) << 16) | ((wrd3 >> 16) & 0xffff);
srp->ieee.mantissa2 = (wrd3 & 0xffff) << 16;
srp->ieee.mantissa3 = 0;
#elif USE_LONG_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#else
uae_u32 sgn = (wrd1 >> 31) & 1;
uae_u32 exp = (wrd1 >> 16) & 0x7fff;
@ -285,19 +312,6 @@ PRIVATE inline fpu_register FFPU make_extended(uae_u32 wrd1, uae_u32 wrd2, uae_u
// drop the explicit integer bit
srp->ieee.mantissa0 = (wrd2 & 0x7fffffff) >> 11;
srp->ieee.mantissa1 = (wrd2 << 21) | (wrd3 >> 11);
#elif USE_QUAD_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = (wrd2 >> 16) & 0xffff;
srp->ieee.mantissa1 = ((wrd2 & 0xffff) << 16) | ((wrd3 >> 16) & 0xffff);
srp->ieee.mantissa2 = (wrd3 & 0xffff) << 16;
#else
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#endif
fpu_debug(("make_extended (%X,%X,%X) = %.04f\n",wrd1,wrd2,wrd3,(double)result));
return result;
@ -322,7 +336,29 @@ PRIVATE inline void FFPU make_extended_no_normalize(
make_nan(result);
return;
}
#ifndef USE_LONG_DOUBLE
#if USE_QUAD_DOUBLE
// is it inf?
if ((wrd1 & 0x7ffff000) == 0x7fff0000 && wrd2 == 0 && wrd3 == 0) {
if ((wrd1 & 0x80000000) == 0)
make_inf_positive(result);
else
make_inf_negative(result);
return;
}
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = (wrd2 >> 16) & 0xffff;
srp->ieee.mantissa1 = ((wrd2 & 0xffff) << 16) | ((wrd3 >> 16) & 0xffff);
srp->ieee.mantissa2 = (wrd3 & 0xffff) << 16;
srp->ieee.mantissa3 = 0;
#elif USE_LONG_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 >> 31) & 1;
srp->ieee.exponent = (wrd1 >> 16) & FP_EXTENDED_EXP_MAX;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#else
uae_u32 exp = (wrd1 >> 16) & 0x7fff;
if (exp < FP_EXTENDED_EXP_BIAS - FP_DOUBLE_EXP_BIAS)
exp = 0;
@ -337,13 +373,6 @@ PRIVATE inline void FFPU make_extended_no_normalize(
// drop the explicit integer bit
srp->ieee.mantissa0 = (wrd2 & 0x7fffffff) >> 11;
srp->ieee.mantissa1 = (wrd2 << 21) | (wrd3 >> 11);
#else
// FIXME: USE_QUAD_DOUBLE
fp_declare_init_shape(srp, result, extended);
srp->ieee.negative = (wrd1 & 0x80000000) != 0;
srp->ieee.exponent = (wrd1 >> 16) & 0x7fff;
srp->ieee.mantissa0 = wrd2;
srp->ieee.mantissa1 = wrd3;
#endif
fpu_debug(("make_extended (%X,%X,%X) = %.04f\n",wrd1,wrd2,wrd3,(double)result));
}
@ -357,7 +386,25 @@ PRIVATE inline void FFPU extract_extended(fpu_register const & src,
*wrd1 = *wrd2 = *wrd3 = 0;
return;
}
#ifndef USE_LONG_DOUBLE
#if USE_QUAD_DOUBLE
// FIXME: deal with denormals?
fp_declare_init_shape(srp, src, extended);
*wrd1 = (srp->ieee.negative << 31) | (srp->ieee.exponent << 16);
// always set the explicit integer bit.
*wrd2 = 0x80000000 | (srp->ieee.mantissa0 << 15) | ((srp->ieee.mantissa1 & 0xfffe0000) >> 17);
*wrd3 = (srp->ieee.mantissa1 << 15) | ((srp->ieee.mantissa2 & 0xfffe0000) >> 17);
#elif USE_LONG_DOUBLE
uae_u32 *p = (uae_u32 *)&src;
#ifdef WORDS_BIGENDIAN
*wrd1 = p[0];
*wrd2 = p[1];
*wrd3 = p[2];
#else
*wrd3 = p[0];
*wrd2 = p[1];
*wrd1 = ( (uae_u32)*((uae_u16 *)&p[2]) ) << 16;
#endif
#else
fp_declare_init_shape(srp, src, double);
fpu_debug(("extract_extended (%d,%d,%X,%X)\n",
srp->ieee.negative , srp->ieee.exponent,
@ -374,18 +421,6 @@ PRIVATE inline void FFPU extract_extended(fpu_register const & src,
// always set the explicit integer bit.
*wrd2 = 0x80000000 | (srp->ieee.mantissa0 << 11) | ((srp->ieee.mantissa1 & 0xffe00000) >> 21);
*wrd3 = srp->ieee.mantissa1 << 11;
#else
// FIXME: USE_QUAD_DOUBLE
uae_u32 *p = (uae_u32 *)&src;
#ifdef WORDS_BIGENDIAN
*wrd1 = p[0];
*wrd2 = p[1];
*wrd3 = p[2];
#else
*wrd3 = p[0];
*wrd2 = p[1];
*wrd1 = ( (uae_u32)*((uae_u16 *)&p[2]) ) << 16;
#endif
#endif
fpu_debug(("extract_extended (%.04f) = %X,%X,%X\n",(double)src,*wrd1,*wrd2,*wrd3));
}