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-rw-r--r--arch/parisc/math-emu/fcnvfu.c536
1 files changed, 536 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/fcnvfu.c b/arch/parisc/math-emu/fcnvfu.c
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+/*
+ * Linux/PA-RISC Project (http://www.parisc-linux.org/)
+ *
+ * Floating-point emulation code
+ * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+/*
+ * 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);
+}
+
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