mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
523 lines
11 KiB
523 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Linux/PA-RISC Project (http://www.parisc-linux.org/) |
|
* |
|
* Floating-point emulation code |
|
* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <[email protected]> |
|
*/ |
|
/* |
|
* BEGIN_DESC |
|
* |
|
* File: |
|
* @(#) pa/spmath/fcnvfu.c $Revision: 1.1 $ |
|
* |
|
* Purpose: |
|
* Floating-point to Unsigned Fixed-point Converts |
|
* |
|
* External Interfaces: |
|
* dbl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status) |
|
* dbl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status) |
|
* sgl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status) |
|
* sgl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status) |
|
* |
|
* Internal Interfaces: |
|
* |
|
* Theory: |
|
* <<please update with a overview of the operation of this file>> |
|
* |
|
* END_DESC |
|
*/ |
|
|
|
|
|
#include "float.h" |
|
#include "sgl_float.h" |
|
#include "dbl_float.h" |
|
#include "cnv_float.h" |
|
|
|
/************************************************************************ |
|
* Floating-point to Unsigned Fixed-point Converts * |
|
************************************************************************/ |
|
|
|
/* |
|
* Single Floating-point to Single Unsigned Fixed |
|
*/ |
|
/*ARGSUSED*/ |
|
int |
|
sgl_to_sgl_fcnvfu( |
|
sgl_floating_point *srcptr, |
|
unsigned int *nullptr, |
|
unsigned int *dstptr, |
|
unsigned int *status) |
|
{ |
|
register unsigned int src, result; |
|
register int src_exponent; |
|
register boolean inexact = FALSE; |
|
|
|
src = *srcptr; |
|
src_exponent = Sgl_exponent(src) - SGL_BIAS; |
|
|
|
/* |
|
* Test for overflow |
|
*/ |
|
if (src_exponent > SGL_FX_MAX_EXP + 1) { |
|
if (Sgl_isone_sign(src)) { |
|
result = 0; |
|
} else { |
|
result = 0xffffffff; |
|
} |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
*dstptr = result; |
|
return(NOEXCEPTION); |
|
} |
|
/* |
|
* Generate result |
|
*/ |
|
if (src_exponent >= 0) { |
|
/* |
|
* Check sign. |
|
* If negative, trap unimplemented. |
|
*/ |
|
if (Sgl_isone_sign(src)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
*dstptr = result; |
|
return(NOEXCEPTION); |
|
} |
|
Sgl_clear_signexponent_set_hidden(src); |
|
Suint_from_sgl_mantissa(src,src_exponent,result); |
|
|
|
/* check for inexact */ |
|
if (Sgl_isinexact_to_unsigned(src,src_exponent)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
result++; |
|
break; |
|
case ROUNDMINUS: /* never negative */ |
|
break; |
|
case ROUNDNEAREST: |
|
if (Sgl_isone_roundbit(src,src_exponent) && |
|
(Sgl_isone_stickybit(src,src_exponent) || |
|
(result & 1))) { |
|
result++; |
|
} |
|
break; |
|
} |
|
} |
|
} else { |
|
result = 0; |
|
|
|
/* check for inexact */ |
|
if (Sgl_isnotzero_exponentmantissa(src)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
if (Sgl_iszero_sign(src)) { |
|
result++; |
|
} |
|
break; |
|
case ROUNDMINUS: |
|
if (Sgl_isone_sign(src)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
break; |
|
case ROUNDNEAREST: |
|
if (src_exponent == -1 && |
|
Sgl_isnotzero_mantissa(src)) { |
|
if (Sgl_isone_sign(src)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
else result++; |
|
} |
|
break; |
|
} |
|
} |
|
} |
|
*dstptr = result; |
|
if (inexact) { |
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
|
else Set_inexactflag(); |
|
} |
|
return(NOEXCEPTION); |
|
} |
|
|
|
/* |
|
* Single Floating-point to Double Unsigned Fixed |
|
*/ |
|
/*ARGSUSED*/ |
|
int |
|
sgl_to_dbl_fcnvfu( |
|
sgl_floating_point *srcptr, |
|
unsigned int *nullptr, |
|
dbl_unsigned *dstptr, |
|
unsigned int *status) |
|
{ |
|
register int src_exponent; |
|
register unsigned int src, resultp1, resultp2; |
|
register boolean inexact = FALSE; |
|
|
|
src = *srcptr; |
|
src_exponent = Sgl_exponent(src) - SGL_BIAS; |
|
|
|
/* |
|
* Test for overflow |
|
*/ |
|
if (src_exponent > DBL_FX_MAX_EXP + 1) { |
|
if (Sgl_isone_sign(src)) { |
|
resultp1 = resultp2 = 0; |
|
} else { |
|
resultp1 = resultp2 = 0xffffffff; |
|
} |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
return(NOEXCEPTION); |
|
} |
|
/* |
|
* Generate result |
|
*/ |
|
if (src_exponent >= 0) { |
|
/* |
|
* Check sign. |
|
* If negative, trap unimplemented. |
|
*/ |
|
if (Sgl_isone_sign(src)) { |
|
resultp1 = resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
return(NOEXCEPTION); |
|
} |
|
Sgl_clear_signexponent_set_hidden(src); |
|
Duint_from_sgl_mantissa(src,src_exponent,resultp1,resultp2); |
|
|
|
/* check for inexact */ |
|
if (Sgl_isinexact_to_unsigned(src,src_exponent)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
Duint_increment(resultp1,resultp2); |
|
break; |
|
case ROUNDMINUS: /* never negative */ |
|
break; |
|
case ROUNDNEAREST: |
|
if (Sgl_isone_roundbit(src,src_exponent) && |
|
(Sgl_isone_stickybit(src,src_exponent) || |
|
Duint_isone_lowp2(resultp2))) { |
|
Duint_increment(resultp1,resultp2); |
|
} |
|
break; |
|
} |
|
} |
|
} else { |
|
Duint_setzero(resultp1,resultp2); |
|
|
|
/* check for inexact */ |
|
if (Sgl_isnotzero_exponentmantissa(src)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
if (Sgl_iszero_sign(src)) { |
|
Duint_increment(resultp1,resultp2); |
|
} |
|
break; |
|
case ROUNDMINUS: |
|
if (Sgl_isone_sign(src)) { |
|
resultp1 = resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
break; |
|
case ROUNDNEAREST: |
|
if (src_exponent == -1 && |
|
Sgl_isnotzero_mantissa(src)) { |
|
if (Sgl_isone_sign(src)) { |
|
resultp1 = 0; |
|
resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
else Duint_increment(resultp1,resultp2); |
|
} |
|
} |
|
} |
|
} |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
if (inexact) { |
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
|
else Set_inexactflag(); |
|
} |
|
return(NOEXCEPTION); |
|
} |
|
|
|
/* |
|
* Double Floating-point to Single Unsigned Fixed |
|
*/ |
|
/*ARGSUSED*/ |
|
int |
|
dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr, |
|
unsigned int *dstptr, unsigned int *status) |
|
{ |
|
register unsigned int srcp1, srcp2, result; |
|
register int src_exponent; |
|
register boolean inexact = FALSE; |
|
|
|
Dbl_copyfromptr(srcptr,srcp1,srcp2); |
|
src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; |
|
|
|
/* |
|
* Test for overflow |
|
*/ |
|
if (src_exponent > SGL_FX_MAX_EXP + 1) { |
|
if (Dbl_isone_sign(srcp1)) { |
|
result = 0; |
|
} else { |
|
result = 0xffffffff; |
|
} |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
*dstptr = result; |
|
return(NOEXCEPTION); |
|
} |
|
/* |
|
* Generate result |
|
*/ |
|
if (src_exponent >= 0) { |
|
/* |
|
* Check sign. |
|
* If negative, trap unimplemented. |
|
*/ |
|
if (Dbl_isone_sign(srcp1)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
*dstptr = result; |
|
return(NOEXCEPTION); |
|
} |
|
Dbl_clear_signexponent_set_hidden(srcp1); |
|
Suint_from_dbl_mantissa(srcp1,srcp2,src_exponent,result); |
|
|
|
/* check for inexact */ |
|
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
result++; |
|
break; |
|
case ROUNDMINUS: /* never negative */ |
|
break; |
|
case ROUNDNEAREST: |
|
if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent) && |
|
(Dbl_isone_stickybit(srcp1,srcp2,src_exponent)|| |
|
result&1)) |
|
result++; |
|
break; |
|
} |
|
/* check for overflow */ |
|
if (result == 0) { |
|
result = 0xffffffff; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
*dstptr = result; |
|
return(NOEXCEPTION); |
|
} |
|
} |
|
} else { |
|
result = 0; |
|
|
|
/* check for inexact */ |
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
if (Dbl_iszero_sign(srcp1)) result++; |
|
break; |
|
case ROUNDMINUS: |
|
if (Dbl_isone_sign(srcp1)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
break; |
|
case ROUNDNEAREST: |
|
if (src_exponent == -1 && |
|
Dbl_isnotzero_mantissa(srcp1,srcp2)) |
|
if (Dbl_isone_sign(srcp1)) { |
|
result = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
else result++; |
|
} |
|
} |
|
} |
|
*dstptr = result; |
|
if (inexact) { |
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
|
else Set_inexactflag(); |
|
} |
|
return(NOEXCEPTION); |
|
} |
|
|
|
/* |
|
* Double Floating-point to Double Unsigned Fixed |
|
*/ |
|
/*ARGSUSED*/ |
|
int |
|
dbl_to_dbl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr, |
|
dbl_unsigned * dstptr, unsigned int *status) |
|
{ |
|
register int src_exponent; |
|
register unsigned int srcp1, srcp2, resultp1, resultp2; |
|
register boolean inexact = FALSE; |
|
|
|
Dbl_copyfromptr(srcptr,srcp1,srcp2); |
|
src_exponent = Dbl_exponent(srcp1) - DBL_BIAS; |
|
|
|
/* |
|
* Test for overflow |
|
*/ |
|
if (src_exponent > DBL_FX_MAX_EXP + 1) { |
|
if (Dbl_isone_sign(srcp1)) { |
|
resultp1 = resultp2 = 0; |
|
} else { |
|
resultp1 = resultp2 = 0xffffffff; |
|
} |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
return(NOEXCEPTION); |
|
} |
|
|
|
/* |
|
* Generate result |
|
*/ |
|
if (src_exponent >= 0) { |
|
/* |
|
* Check sign. |
|
* If negative, trap unimplemented. |
|
*/ |
|
if (Dbl_isone_sign(srcp1)) { |
|
resultp1 = resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
return(NOEXCEPTION); |
|
} |
|
Dbl_clear_signexponent_set_hidden(srcp1); |
|
Duint_from_dbl_mantissa(srcp1,srcp2,src_exponent,resultp1, |
|
resultp2); |
|
|
|
/* check for inexact */ |
|
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
Duint_increment(resultp1,resultp2); |
|
break; |
|
case ROUNDMINUS: /* never negative */ |
|
break; |
|
case ROUNDNEAREST: |
|
if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent)) |
|
if(Dbl_isone_stickybit(srcp1,srcp2,src_exponent) || |
|
Duint_isone_lowp2(resultp2)) |
|
Duint_increment(resultp1,resultp2); |
|
} |
|
} |
|
} else { |
|
Duint_setzero(resultp1,resultp2); |
|
|
|
/* check for inexact */ |
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) { |
|
inexact = TRUE; |
|
/* round result */ |
|
switch (Rounding_mode()) { |
|
case ROUNDPLUS: |
|
if (Dbl_iszero_sign(srcp1)) { |
|
Duint_increment(resultp1,resultp2); |
|
} |
|
break; |
|
case ROUNDMINUS: |
|
if (Dbl_isone_sign(srcp1)) { |
|
resultp1 = resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
break; |
|
case ROUNDNEAREST: |
|
if (src_exponent == -1 && |
|
Dbl_isnotzero_mantissa(srcp1,srcp2)) |
|
if (Dbl_iszero_sign(srcp1)) { |
|
Duint_increment(resultp1,resultp2); |
|
} else { |
|
resultp1 = 0; |
|
resultp2 = 0; |
|
if (Is_invalidtrap_enabled()) { |
|
return(INVALIDEXCEPTION); |
|
} |
|
Set_invalidflag(); |
|
inexact = FALSE; |
|
} |
|
} |
|
} |
|
} |
|
Duint_copytoptr(resultp1,resultp2,dstptr); |
|
if (inexact) { |
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION); |
|
else Set_inexactflag(); |
|
} |
|
return(NOEXCEPTION); |
|
} |
|
|
|
|