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-rw-r--r--ANDROID_3.4.5/arch/parisc/math-emu/fcnvxf.c386
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diff --git a/ANDROID_3.4.5/arch/parisc/math-emu/fcnvxf.c b/ANDROID_3.4.5/arch/parisc/math-emu/fcnvxf.c
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index 05c7fadb..00000000
--- a/ANDROID_3.4.5/arch/parisc/math-emu/fcnvxf.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/fcnvxf.c $Revision: 1.1 $
- *
- * Purpose:
- * Single Fixed-point to Single Floating-point
- * Single Fixed-point to Double Floating-point
- * Double Fixed-point to Single Floating-point
- * Double Fixed-point to Double Floating-point
- *
- * External Interfaces:
- * dbl_to_dbl_fcnvxf(srcptr,nullptr,dstptr,status)
- * dbl_to_sgl_fcnvxf(srcptr,nullptr,dstptr,status)
- * sgl_to_dbl_fcnvxf(srcptr,nullptr,dstptr,status)
- * sgl_to_sgl_fcnvxf(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"
-
-/*
- * Convert single fixed-point to single floating-point format
- */
-
-int
-sgl_to_sgl_fcnvxf(
- int *srcptr,
- unsigned int *nullptr,
- sgl_floating_point *dstptr,
- unsigned int *status)
-{
- register int src, dst_exponent;
- register unsigned int result = 0;
-
- src = *srcptr;
- /*
- * set sign bit of result and get magnitude of source
- */
- if (src < 0) {
- Sgl_setone_sign(result);
- Int_negate(src);
- }
- else {
- Sgl_setzero_sign(result);
- /* Check for zero */
- if (src == 0) {
- Sgl_setzero(result);
- *dstptr = result;
- return(NOEXCEPTION);
- }
- }
- /*
- * Generate exponent and normalized mantissa
- */
- dst_exponent = 16; /* initialize for normalization */
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- */
- Find_ms_one_bit(src,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent >= 0) src <<= dst_exponent;
- else src = 1 << 30;
- Sgl_set_mantissa(result, src >> (SGL_EXP_LENGTH-1));
- Sgl_set_exponent(result, 30+SGL_BIAS - dst_exponent);
-
- /* check for inexact */
- if (Int_isinexact_to_sgl(src)) {
- switch (Rounding_mode()) {
- case ROUNDPLUS:
- if (Sgl_iszero_sign(result))
- Sgl_increment(result);
- break;
- case ROUNDMINUS:
- if (Sgl_isone_sign(result))
- Sgl_increment(result);
- break;
- case ROUNDNEAREST:
- Sgl_roundnearest_from_int(src,result);
- }
- if (Is_inexacttrap_enabled()) {
- *dstptr = result;
- return(INEXACTEXCEPTION);
- }
- else Set_inexactflag();
- }
- *dstptr = result;
- return(NOEXCEPTION);
-}
-
-/*
- * Single Fixed-point to Double Floating-point
- */
-
-int
-sgl_to_dbl_fcnvxf(
- int *srcptr,
- unsigned int *nullptr,
- dbl_floating_point *dstptr,
- unsigned int *status)
-{
- register int src, dst_exponent;
- register unsigned int resultp1 = 0, resultp2 = 0;
-
- src = *srcptr;
- /*
- * set sign bit of result and get magnitude of source
- */
- if (src < 0) {
- Dbl_setone_sign(resultp1);
- Int_negate(src);
- }
- else {
- Dbl_setzero_sign(resultp1);
- /* Check for zero */
- if (src == 0) {
- Dbl_setzero(resultp1,resultp2);
- Dbl_copytoptr(resultp1,resultp2,dstptr);
- return(NOEXCEPTION);
- }
- }
- /*
- * Generate exponent and normalized mantissa
- */
- dst_exponent = 16; /* initialize for normalization */
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- */
- Find_ms_one_bit(src,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent >= 0) src <<= dst_exponent;
- else src = 1 << 30;
- Dbl_set_mantissap1(resultp1, src >> DBL_EXP_LENGTH - 1);
- Dbl_set_mantissap2(resultp2, src << (33-DBL_EXP_LENGTH));
- Dbl_set_exponent(resultp1, (30+DBL_BIAS) - dst_exponent);
- Dbl_copytoptr(resultp1,resultp2,dstptr);
- return(NOEXCEPTION);
-}
-
-/*
- * Double Fixed-point to Single Floating-point
- */
-
-int
-dbl_to_sgl_fcnvxf(
- dbl_integer *srcptr,
- unsigned int *nullptr,
- sgl_floating_point *dstptr,
- unsigned int *status)
-{
- int dst_exponent, srcp1;
- unsigned int result = 0, srcp2;
-
- Dint_copyfromptr(srcptr,srcp1,srcp2);
- /*
- * set sign bit of result and get magnitude of source
- */
- if (srcp1 < 0) {
- Sgl_setone_sign(result);
- Dint_negate(srcp1,srcp2);
- }
- else {
- Sgl_setzero_sign(result);
- /* Check for zero */
- if (srcp1 == 0 && srcp2 == 0) {
- Sgl_setzero(result);
- *dstptr = result;
- return(NOEXCEPTION);
- }
- }
- /*
- * Generate exponent and normalized mantissa
- */
- dst_exponent = 16; /* initialize for normalization */
- if (srcp1 == 0) {
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- */
- Find_ms_one_bit(srcp2,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent >= 0) {
- srcp1 = srcp2 << dst_exponent;
- srcp2 = 0;
- }
- else {
- srcp1 = srcp2 >> 1;
- srcp2 <<= 31;
- }
- /*
- * since msb set is in second word, need to
- * adjust bit position count
- */
- dst_exponent += 32;
- }
- else {
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- *
- */
- Find_ms_one_bit(srcp1,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent > 0) {
- Variable_shift_double(srcp1,srcp2,(32-dst_exponent),
- srcp1);
- srcp2 <<= dst_exponent;
- }
- /*
- * If dst_exponent = 0, we don't need to shift anything.
- * If dst_exponent = -1, src = - 2**63 so we won't need to
- * shift srcp2.
- */
- else srcp1 >>= -(dst_exponent);
- }
- Sgl_set_mantissa(result, srcp1 >> SGL_EXP_LENGTH - 1);
- Sgl_set_exponent(result, (62+SGL_BIAS) - dst_exponent);
-
- /* check for inexact */
- if (Dint_isinexact_to_sgl(srcp1,srcp2)) {
- switch (Rounding_mode()) {
- case ROUNDPLUS:
- if (Sgl_iszero_sign(result))
- Sgl_increment(result);
- break;
- case ROUNDMINUS:
- if (Sgl_isone_sign(result))
- Sgl_increment(result);
- break;
- case ROUNDNEAREST:
- Sgl_roundnearest_from_dint(srcp1,srcp2,result);
- }
- if (Is_inexacttrap_enabled()) {
- *dstptr = result;
- return(INEXACTEXCEPTION);
- }
- else Set_inexactflag();
- }
- *dstptr = result;
- return(NOEXCEPTION);
-}
-
-/*
- * Double Fixed-point to Double Floating-point
- */
-
-int
-dbl_to_dbl_fcnvxf(
- dbl_integer *srcptr,
- unsigned int *nullptr,
- dbl_floating_point *dstptr,
- unsigned int *status)
-{
- register int srcp1, dst_exponent;
- register unsigned int srcp2, resultp1 = 0, resultp2 = 0;
-
- Dint_copyfromptr(srcptr,srcp1,srcp2);
- /*
- * set sign bit of result and get magnitude of source
- */
- if (srcp1 < 0) {
- Dbl_setone_sign(resultp1);
- Dint_negate(srcp1,srcp2);
- }
- else {
- Dbl_setzero_sign(resultp1);
- /* Check for zero */
- if (srcp1 == 0 && srcp2 ==0) {
- Dbl_setzero(resultp1,resultp2);
- Dbl_copytoptr(resultp1,resultp2,dstptr);
- return(NOEXCEPTION);
- }
- }
- /*
- * Generate exponent and normalized mantissa
- */
- dst_exponent = 16; /* initialize for normalization */
- if (srcp1 == 0) {
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- */
- Find_ms_one_bit(srcp2,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent >= 0) {
- srcp1 = srcp2 << dst_exponent;
- srcp2 = 0;
- }
- else {
- srcp1 = srcp2 >> 1;
- srcp2 <<= 31;
- }
- /*
- * since msb set is in second word, need to
- * adjust bit position count
- */
- dst_exponent += 32;
- }
- else {
- /*
- * Check word for most significant bit set. Returns
- * a value in dst_exponent indicating the bit position,
- * between -1 and 30.
- */
- Find_ms_one_bit(srcp1,dst_exponent);
- /* left justify source, with msb at bit position 1 */
- if (dst_exponent > 0) {
- Variable_shift_double(srcp1,srcp2,(32-dst_exponent),
- srcp1);
- srcp2 <<= dst_exponent;
- }
- /*
- * If dst_exponent = 0, we don't need to shift anything.
- * If dst_exponent = -1, src = - 2**63 so we won't need to
- * shift srcp2.
- */
- else srcp1 >>= -(dst_exponent);
- }
- Dbl_set_mantissap1(resultp1, srcp1 >> (DBL_EXP_LENGTH-1));
- Shiftdouble(srcp1,srcp2,DBL_EXP_LENGTH-1,resultp2);
- Dbl_set_exponent(resultp1, (62+DBL_BIAS) - dst_exponent);
-
- /* check for inexact */
- if (Dint_isinexact_to_dbl(srcp2)) {
- switch (Rounding_mode()) {
- case ROUNDPLUS:
- if (Dbl_iszero_sign(resultp1)) {
- Dbl_increment(resultp1,resultp2);
- }
- break;
- case ROUNDMINUS:
- if (Dbl_isone_sign(resultp1)) {
- Dbl_increment(resultp1,resultp2);
- }
- break;
- case ROUNDNEAREST:
- Dbl_roundnearest_from_dint(srcp2,resultp1,
- resultp2);
- }
- if (Is_inexacttrap_enabled()) {
- Dbl_copytoptr(resultp1,resultp2,dstptr);
- return(INEXACTEXCEPTION);
- }
- else Set_inexactflag();
- }
- Dbl_copytoptr(resultp1,resultp2,dstptr);
- return(NOEXCEPTION);
-}
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