patch-2.4.20 linux-2.4.20/arch/parisc/math-emu/fcnvfx.c
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- Lines: 502
- Date:
Thu Nov 28 15:53:10 2002
- Orig file:
linux-2.4.19/arch/parisc/math-emu/fcnvfx.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/arch/parisc/math-emu/fcnvfx.c linux-2.4.20/arch/parisc/math-emu/fcnvfx.c
@@ -0,0 +1,501 @@
+/*
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/*
+ * BEGIN_DESC
+ *
+ * File:
+ * @(#) pa/spmath/fcnvfx.c $Revision: 1.1 $
+ *
+ * Purpose:
+ * Single Floating-point to Single Fixed-point
+ * Single Floating-point to Double Fixed-point
+ * Double Floating-point to Single Fixed-point
+ * Double Floating-point to Double Fixed-point
+ *
+ * External Interfaces:
+ * dbl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
+ * dbl_to_sgl_fcnvfx(srcptr,nullptr,dstptr,status)
+ * sgl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
+ * sgl_to_sgl_fcnvfx(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"
+
+/*
+ * Single Floating-point to Single Fixed-point
+ */
+/*ARGSUSED*/
+int
+sgl_to_sgl_fcnvfx(
+ sgl_floating_point *srcptr,
+ sgl_floating_point *nullptr,
+ int *dstptr,
+ sgl_floating_point *status)
+{
+ register unsigned int src, temp;
+ register int src_exponent, result;
+ register boolean inexact = FALSE;
+
+ src = *srcptr;
+ src_exponent = Sgl_exponent(src) - SGL_BIAS;
+
+ /*
+ * Test for overflow
+ */
+ if (src_exponent > SGL_FX_MAX_EXP) {
+ /* check for MININT */
+ if ((src_exponent > SGL_FX_MAX_EXP + 1) ||
+ Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
+ if (Sgl_iszero_sign(src)) result = 0x7fffffff;
+ else result = 0x80000000;
+
+ if (Is_invalidtrap_enabled()) {
+ return(INVALIDEXCEPTION);
+ }
+ Set_invalidflag();
+ *dstptr = result;
+ return(NOEXCEPTION);
+ }
+ }
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ temp = src;
+ Sgl_clear_signexponent_set_hidden(temp);
+ Int_from_sgl_mantissa(temp,src_exponent);
+ if (Sgl_isone_sign(src)) result = -Sgl_all(temp);
+ else result = Sgl_all(temp);
+
+ /* check for inexact */
+ if (Sgl_isinexact_to_fix(src,src_exponent)) {
+ inexact = TRUE;
+ /* round result */
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ if (Sgl_iszero_sign(src)) result++;
+ break;
+ case ROUNDMINUS:
+ if (Sgl_isone_sign(src)) result--;
+ break;
+ case ROUNDNEAREST:
+ if (Sgl_isone_roundbit(src,src_exponent)) {
+ if (Sgl_isone_stickybit(src,src_exponent)
+ || (Sgl_isone_lowmantissa(temp)))
+ if (Sgl_iszero_sign(src)) result++;
+ else result--;
+ }
+ }
+ }
+ }
+ 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--;
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Sgl_isnotzero_mantissa(src))
+ if (Sgl_iszero_sign(src)) result++;
+ else result--;
+ }
+ }
+ }
+ *dstptr = result;
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
+
+/*
+ * Single Floating-point to Double Fixed-point
+ */
+/*ARGSUSED*/
+int
+sgl_to_dbl_fcnvfx(
+ sgl_floating_point *srcptr,
+ unsigned int *nullptr,
+ dbl_integer *dstptr,
+ unsigned int *status)
+{
+ register int src_exponent, resultp1;
+ register unsigned int src, temp, resultp2;
+ register boolean inexact = FALSE;
+
+ src = *srcptr;
+ src_exponent = Sgl_exponent(src) - SGL_BIAS;
+
+ /*
+ * Test for overflow
+ */
+ if (src_exponent > DBL_FX_MAX_EXP) {
+ /* check for MININT */
+ if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
+ Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
+ if (Sgl_iszero_sign(src)) {
+ resultp1 = 0x7fffffff;
+ resultp2 = 0xffffffff;
+ }
+ else {
+ resultp1 = 0x80000000;
+ resultp2 = 0;
+ }
+ if (Is_invalidtrap_enabled()) {
+ return(INVALIDEXCEPTION);
+ }
+ Set_invalidflag();
+ Dint_copytoptr(resultp1,resultp2,dstptr);
+ return(NOEXCEPTION);
+ }
+ Dint_set_minint(resultp1,resultp2);
+ Dint_copytoptr(resultp1,resultp2,dstptr);
+ return(NOEXCEPTION);
+ }
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ temp = src;
+ Sgl_clear_signexponent_set_hidden(temp);
+ Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2);
+ if (Sgl_isone_sign(src)) {
+ Dint_setone_sign(resultp1,resultp2);
+ }
+
+ /* check for inexact */
+ if (Sgl_isinexact_to_fix(src,src_exponent)) {
+ inexact = TRUE;
+ /* round result */
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ if (Sgl_iszero_sign(src)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ break;
+ case ROUNDMINUS:
+ if (Sgl_isone_sign(src)) {
+ Dint_decrement(resultp1,resultp2);
+ }
+ break;
+ case ROUNDNEAREST:
+ if (Sgl_isone_roundbit(src,src_exponent))
+ if (Sgl_isone_stickybit(src,src_exponent) ||
+ (Dint_isone_lowp2(resultp2)))
+ if (Sgl_iszero_sign(src)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ else {
+ Dint_decrement(resultp1,resultp2);
+ }
+ }
+ }
+ }
+ else {
+ Dint_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)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ break;
+ case ROUNDMINUS:
+ if (Sgl_isone_sign(src)) {
+ Dint_decrement(resultp1,resultp2);
+ }
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Sgl_isnotzero_mantissa(src))
+ if (Sgl_iszero_sign(src)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ else {
+ Dint_decrement(resultp1,resultp2);
+ }
+ }
+ }
+ }
+ Dint_copytoptr(resultp1,resultp2,dstptr);
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
+
+/*
+ * Double Floating-point to Single Fixed-point
+ */
+/*ARGSUSED*/
+int
+dbl_to_sgl_fcnvfx(
+ dbl_floating_point *srcptr,
+ unsigned int *nullptr,
+ int *dstptr,
+ unsigned int *status)
+{
+ register unsigned int srcp1,srcp2, tempp1,tempp2;
+ register int src_exponent, result;
+ 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) {
+ /* check for MININT */
+ if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) {
+ if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff;
+ else result = 0x80000000;
+
+ if (Is_invalidtrap_enabled()) {
+ return(INVALIDEXCEPTION);
+ }
+ Set_invalidflag();
+ *dstptr = result;
+ return(NOEXCEPTION);
+ }
+ }
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ tempp1 = srcp1;
+ tempp2 = srcp2;
+ Dbl_clear_signexponent_set_hidden(tempp1);
+ Int_from_dbl_mantissa(tempp1,tempp2,src_exponent);
+ if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP))
+ result = -Dbl_allp1(tempp1);
+ else result = Dbl_allp1(tempp1);
+
+ /* check for inexact */
+ if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
+ inexact = TRUE;
+ /* round result */
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ if (Dbl_iszero_sign(srcp1)) result++;
+ break;
+ case ROUNDMINUS:
+ if (Dbl_isone_sign(srcp1)) result--;
+ break;
+ case ROUNDNEAREST:
+ if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
+ if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) ||
+ (Dbl_isone_lowmantissap1(tempp1)))
+ if (Dbl_iszero_sign(srcp1)) result++;
+ else result--;
+ }
+ /* check for overflow */
+ if ((Dbl_iszero_sign(srcp1) && result < 0) ||
+ (Dbl_isone_sign(srcp1) && result > 0)) {
+
+ if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff;
+ else result = 0x80000000;
+
+ 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--;
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Dbl_isnotzero_mantissa(srcp1,srcp2))
+ if (Dbl_iszero_sign(srcp1)) result++;
+ else result--;
+ }
+ }
+ }
+ *dstptr = result;
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
+
+/*
+ * Double Floating-point to Double Fixed-point
+ */
+/*ARGSUSED*/
+int
+dbl_to_dbl_fcnvfx(
+ dbl_floating_point *srcptr,
+ unsigned int *nullptr,
+ dbl_integer *dstptr,
+ unsigned int *status)
+{
+ register int src_exponent, resultp1;
+ register unsigned int srcp1, srcp2, tempp1, tempp2, 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) {
+ /* check for MININT */
+ if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
+ Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) {
+ if (Dbl_iszero_sign(srcp1)) {
+ resultp1 = 0x7fffffff;
+ resultp2 = 0xffffffff;
+ }
+ else {
+ resultp1 = 0x80000000;
+ resultp2 = 0;
+ }
+ if (Is_invalidtrap_enabled()) {
+ return(INVALIDEXCEPTION);
+ }
+ Set_invalidflag();
+ Dint_copytoptr(resultp1,resultp2,dstptr);
+ return(NOEXCEPTION);
+ }
+ }
+
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ tempp1 = srcp1;
+ tempp2 = srcp2;
+ Dbl_clear_signexponent_set_hidden(tempp1);
+ Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent,resultp1,
+ resultp2);
+ if (Dbl_isone_sign(srcp1)) {
+ Dint_setone_sign(resultp1,resultp2);
+ }
+
+ /* check for inexact */
+ if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
+ inexact = TRUE;
+ /* round result */
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ if (Dbl_iszero_sign(srcp1)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ break;
+ case ROUNDMINUS:
+ if (Dbl_isone_sign(srcp1)) {
+ Dint_decrement(resultp1,resultp2);
+ }
+ break;
+ case ROUNDNEAREST:
+ if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
+ if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) ||
+ (Dint_isone_lowp2(resultp2)))
+ if (Dbl_iszero_sign(srcp1)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ else {
+ Dint_decrement(resultp1,resultp2);
+ }
+ }
+ }
+ }
+ else {
+ Dint_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)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ break;
+ case ROUNDMINUS:
+ if (Dbl_isone_sign(srcp1)) {
+ Dint_decrement(resultp1,resultp2);
+ }
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Dbl_isnotzero_mantissa(srcp1,srcp2))
+ if (Dbl_iszero_sign(srcp1)) {
+ Dint_increment(resultp1,resultp2);
+ }
+ else {
+ Dint_decrement(resultp1,resultp2);
+ }
+ }
+ }
+ }
+ Dint_copytoptr(resultp1,resultp2,dstptr);
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
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