- 根目录:
- arch
- parisc
- math-emu
- dfadd.c
#include "float.h"
#include "dbl_float.h"
dbl_fadd(
dbl_floating_point *leftptr,
dbl_floating_point *rightptr,
dbl_floating_point *dstptr,
unsigned int *status)
{
register unsigned int signless_upper_left, signless_upper_right, save;
register unsigned int leftp1, leftp2, rightp1, rightp2, extent;
register unsigned int resultp1 = 0, resultp2 = 0;
register int result_exponent, right_exponent, diff_exponent;
register int sign_save, jumpsize;
register boolean inexact = FALSE;
register boolean underflowtrap;
Dbl_copyfromptr(leftptr,leftp1,leftp2);
Dbl_copyfromptr(rightptr,rightp1,rightp2);
Dbl_xortointp1(leftp1,rightp1,save);
if ((result_exponent = Dbl_exponent(leftp1)) == DBL_INFINITY_EXPONENT)
{
if (Dbl_iszero_mantissa(leftp1,leftp2))
{
if (Dbl_isnotnan(rightp1,rightp2))
{
if (Dbl_isinfinity(rightp1,rightp2) && save!=0)
{
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
Set_invalidflag();
Dbl_makequietnan(resultp1,resultp2);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
Dbl_copytoptr(leftp1,leftp2,dstptr);
return(NOEXCEPTION);
}
}
else
{
if (Dbl_isone_signaling(leftp1))
{
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
Set_invalidflag();
Dbl_set_quiet(leftp1);
}
else if (Dbl_is_signalingnan(rightp1))
{
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
Set_invalidflag();
Dbl_set_quiet(rightp1);
Dbl_copytoptr(rightp1,rightp2,dstptr);
return(NOEXCEPTION);
}
Dbl_copytoptr(leftp1,leftp2,dstptr);
return(NOEXCEPTION);
}
}
if (Dbl_isinfinity_exponent(rightp1))
{
if (Dbl_iszero_mantissa(rightp1,rightp2))
{
Dbl_copytoptr(rightp1,rightp2,dstptr);
return(NOEXCEPTION);
}
if (Dbl_isone_signaling(rightp1))
{
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
Set_invalidflag();
Dbl_set_quiet(rightp1);
}
Dbl_copytoptr(rightp1,rightp2,dstptr);
return(NOEXCEPTION);
}
Dbl_copytoint_exponentmantissap1(leftp1,signless_upper_left);
Dbl_copytoint_exponentmantissap1(rightp1,signless_upper_right);
if(Dbl_ismagnitudeless(leftp2,rightp2,signless_upper_left,signless_upper_right))
{
Dbl_xorfromintp1(save,rightp1,rightp1);
Dbl_xorfromintp1(save,leftp1,leftp1);
Dbl_swap_lower(leftp2,rightp2);
result_exponent = Dbl_exponent(leftp1);
}
if((right_exponent = Dbl_exponent(rightp1)) == 0)
{
if(Dbl_iszero_mantissa(rightp1,rightp2))
{
if(Dbl_iszero_exponentmantissa(leftp1,leftp2))
{
if(Is_rounding_mode(ROUNDMINUS))
{
Dbl_or_signs(leftp1,rightp1);
}
else
{
Dbl_and_signs(leftp1,rightp1);
}
}
else
{
if( (result_exponent == 0) && Is_underflowtrap_enabled() )
{
sign_save = Dbl_signextendedsign(leftp1);
Dbl_leftshiftby1(leftp1,leftp2);
Dbl_normalize(leftp1,leftp2,result_exponent);
Dbl_set_sign(leftp1,sign_save);
Dbl_setwrapped_exponent(leftp1,result_exponent,unfl);
Dbl_copytoptr(leftp1,leftp2,dstptr);
return(UNDERFLOWEXCEPTION);
}
}
Dbl_copytoptr(leftp1,leftp2,dstptr);
return(NOEXCEPTION);
}
Dbl_clear_sign(rightp1);
if(result_exponent == 0 )
{
if( (int) save < 0 )
{
Dbl_subtract(leftp1,leftp2,rightp1,rightp2,
resultp1,resultp2);
if(Dbl_iszero_mantissa(resultp1,resultp2))
{
if(Is_rounding_mode(ROUNDMINUS))
{
Dbl_setone_sign(resultp1);
}
else
{
Dbl_setzero_sign(resultp1);
}
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
}
else
{
Dbl_addition(leftp1,leftp2,rightp1,rightp2,
resultp1,resultp2);
if(Dbl_isone_hidden(resultp1))
{
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
}
if(Is_underflowtrap_enabled())
{
sign_save = Dbl_signextendedsign(resultp1);
Dbl_leftshiftby1(resultp1,resultp2);
Dbl_normalize(resultp1,resultp2,result_exponent);
Dbl_set_sign(resultp1,sign_save);
Dbl_setwrapped_exponent(resultp1,result_exponent,unfl);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(UNDERFLOWEXCEPTION);
}
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
right_exponent = 1;
}
else
{
Dbl_clear_signexponent_set_hidden(rightp1);
}
Dbl_clear_exponent_set_hidden(leftp1);
diff_exponent = result_exponent - right_exponent;
if(diff_exponent > DBL_THRESHOLD)
{
diff_exponent = DBL_THRESHOLD;
}
Dbl_right_align(rightp1,rightp2,diff_exponent,
extent);
if( (int) save < 0 )
{
Dbl_subtract_withextension(leftp1,leftp2,rightp1,rightp2,
extent,resultp1,resultp2);
if(Dbl_iszero_hidden(resultp1))
{
sign_save = Dbl_signextendedsign(resultp1);
Dbl_leftshiftby1_withextent(resultp1,resultp2,extent,resultp1,resultp2);
if(Dbl_iszero(resultp1,resultp2))
{
if(Is_rounding_mode(ROUNDMINUS)) Dbl_setone_sign(resultp1);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
result_exponent--;
if(Dbl_isone_hidden(resultp1))
{
if(result_exponent==0)
{
goto underflow;
}
else
{
Dbl_set_sign(resultp1,sign_save);
Ext_leftshiftby1(extent);
goto round;
}
}
if(!(underflowtrap = Is_underflowtrap_enabled()) &&
result_exponent==0) goto underflow;
Ext_leftshiftby1(extent);
while(Dbl_iszero_hiddenhigh7mantissa(resultp1))
{
Dbl_leftshiftby8(resultp1,resultp2);
if((result_exponent -= 8) <= 0 && !underflowtrap)
goto underflow;
}
if(Dbl_iszero_hiddenhigh3mantissa(resultp1))
{
Dbl_leftshiftby4(resultp1,resultp2);
if((result_exponent -= 4) <= 0 && !underflowtrap)
goto underflow;
}
if((jumpsize = Dbl_hiddenhigh3mantissa(resultp1)) > 7)
{
if(result_exponent <= 0) goto underflow;
Dbl_set_sign(resultp1,sign_save);
Dbl_set_exponent(resultp1,result_exponent);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
Dbl_sethigh4bits(resultp1,sign_save);
switch(jumpsize)
{
case 1:
{
Dbl_leftshiftby3(resultp1,resultp2);
result_exponent -= 3;
break;
}
case 2:
case 3:
{
Dbl_leftshiftby2(resultp1,resultp2);
result_exponent -= 2;
break;
}
case 4:
case 5:
case 6:
case 7:
{
Dbl_leftshiftby1(resultp1,resultp2);
result_exponent -= 1;
break;
}
}
if(result_exponent > 0)
{
Dbl_set_exponent(resultp1,result_exponent);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
underflow:
if(Is_underflowtrap_enabled())
{
Dbl_set_sign(resultp1,sign_save);
Dbl_setwrapped_exponent(resultp1,result_exponent,unfl);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(UNDERFLOWEXCEPTION);
}
Dbl_fix_overshift(resultp1,resultp2,(1-result_exponent),extent);
Dbl_clear_signexponent(resultp1);
Dbl_set_sign(resultp1,sign_save);
Dbl_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
}
else
{
Dbl_addition(leftp1,leftp2,rightp1,rightp2,resultp1,resultp2);
if(Dbl_isone_hiddenoverflow(resultp1))
{
Dbl_rightshiftby1_withextent(resultp2,extent,extent);
Dbl_arithrightshiftby1(resultp1,resultp2);
result_exponent++;
}
}
round:
if(Ext_isnotzero(extent))
{
inexact = TRUE;
switch(Rounding_mode())
{
case ROUNDNEAREST:
if(Ext_isone_sign(extent))
{
if(Ext_isnotzero_lower(extent) ||
Dbl_isone_lowmantissap2(resultp2))
{
Dbl_increment(resultp1,resultp2);
}
}
break;
case ROUNDPLUS:
if(Dbl_iszero_sign(resultp1))
{
Dbl_increment(resultp1,resultp2);
}
break;
case ROUNDMINUS:
if(Dbl_isone_sign(resultp1))
{
Dbl_increment(resultp1,resultp2);
}
case ROUNDZERO:;
}
if(Dbl_isone_hiddenoverflow(resultp1)) result_exponent++;
}
if(result_exponent == DBL_INFINITY_EXPONENT)
{
if(Is_overflowtrap_enabled())
{
Dbl_setwrapped_exponent(resultp1,result_exponent,ovfl);
Dbl_copytoptr(resultp1,resultp2,dstptr);
if (inexact)
if (Is_inexacttrap_enabled())
return(OVERFLOWEXCEPTION | INEXACTEXCEPTION);
else Set_inexactflag();
return(OVERFLOWEXCEPTION);
}
else
{
inexact = TRUE;
Set_overflowflag();
Dbl_setoverflow(resultp1,resultp2);
}
}
else Dbl_set_exponent(resultp1,result_exponent);
Dbl_copytoptr(resultp1,resultp2,dstptr);
if(inexact)
if(Is_inexacttrap_enabled())
return(INEXACTEXCEPTION);
else Set_inexactflag();
return(NOEXCEPTION);
}
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