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-rw-r--r--arch/parisc/math-emu/fcnvuf.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/fcnvuf.c b/arch/parisc/math-emu/fcnvuf.c
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+++ b/arch/parisc/math-emu/fcnvuf.c
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+// 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) <bame@debian.org>
+ */
+/*
+ * BEGIN_DESC
+ *
+ * File:
+ * @(#) pa/spmath/fcnvuf.c $Revision: 1.1 $
+ *
+ * Purpose:
+ * Fixed point to Floating-point Converts
+ *
+ * External Interfaces:
+ * dbl_to_dbl_fcnvuf(srcptr,nullptr,dstptr,status)
+ * dbl_to_sgl_fcnvuf(srcptr,nullptr,dstptr,status)
+ * sgl_to_dbl_fcnvuf(srcptr,nullptr,dstptr,status)
+ * sgl_to_sgl_fcnvuf(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"
+
+/************************************************************************
+ * Fixed point to Floating-point Converts *
+ ************************************************************************/
+
+/*
+ * Convert Single Unsigned Fixed to Single Floating-point format
+ */
+
+int
+sgl_to_sgl_fcnvuf(
+ unsigned int *srcptr,
+ unsigned int *nullptr,
+ sgl_floating_point *dstptr,
+ unsigned int *status)
+{
+ register unsigned int src, result = 0;
+ register int dst_exponent;
+
+ src = *srcptr;
+
+ /* 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 0 */
+ src <<= dst_exponent+1;
+ Sgl_set_mantissa(result, src >> SGL_EXP_LENGTH);
+ Sgl_set_exponent(result, 30+SGL_BIAS - dst_exponent);
+
+ /* check for inexact */
+ if (Suint_isinexact_to_sgl(src)) {
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ Sgl_increment(result);
+ break;
+ case ROUNDMINUS: /* never negative */
+ break;
+ case ROUNDNEAREST:
+ Sgl_roundnearest_from_suint(src,result);
+ break;
+ }
+ if (Is_inexacttrap_enabled()) {
+ *dstptr = result;
+ return(INEXACTEXCEPTION);
+ }
+ else Set_inexactflag();
+ }
+ *dstptr = result;
+ return(NOEXCEPTION);
+}
+
+/*
+ * Single Unsigned Fixed to Double Floating-point
+ */
+
+int
+sgl_to_dbl_fcnvuf(
+ unsigned int *srcptr,
+ unsigned int *nullptr,
+ dbl_floating_point *dstptr,
+ unsigned int *status)
+{
+ register int dst_exponent;
+ register unsigned int src, resultp1 = 0, resultp2 = 0;
+
+ src = *srcptr;
+
+ /* 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 0 */
+ src <<= dst_exponent+1;
+ Dbl_set_mantissap1(resultp1, src >> DBL_EXP_LENGTH);
+ Dbl_set_mantissap2(resultp2, src << (32-DBL_EXP_LENGTH));
+ Dbl_set_exponent(resultp1, (30+DBL_BIAS) - dst_exponent);
+ Dbl_copytoptr(resultp1,resultp2,dstptr);
+ return(NOEXCEPTION);
+}
+
+/*
+ * Double Unsigned Fixed to Single Floating-point
+ */
+
+int
+dbl_to_sgl_fcnvuf(
+ dbl_unsigned *srcptr,
+ unsigned int *nullptr,
+ sgl_floating_point *dstptr,
+ unsigned int *status)
+{
+ int dst_exponent;
+ unsigned int srcp1, srcp2, result = 0;
+
+ Duint_copyfromptr(srcptr,srcp1,srcp2);
+
+ /* 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 0 */
+ srcp1 = srcp2 << dst_exponent+1;
+ srcp2 = 0;
+ /*
+ * 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 0 */
+ if (dst_exponent >= 0) {
+ Variable_shift_double(srcp1,srcp2,(31-dst_exponent),
+ srcp1);
+ srcp2 <<= dst_exponent+1;
+ }
+ }
+ Sgl_set_mantissa(result, srcp1 >> SGL_EXP_LENGTH);
+ Sgl_set_exponent(result, (62+SGL_BIAS) - dst_exponent);
+
+ /* check for inexact */
+ if (Duint_isinexact_to_sgl(srcp1,srcp2)) {
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ Sgl_increment(result);
+ break;
+ case ROUNDMINUS: /* never negative */
+ break;
+ case ROUNDNEAREST:
+ Sgl_roundnearest_from_duint(srcp1,srcp2,result);
+ break;
+ }
+ if (Is_inexacttrap_enabled()) {
+ *dstptr = result;
+ return(INEXACTEXCEPTION);
+ }
+ else Set_inexactflag();
+ }
+ *dstptr = result;
+ return(NOEXCEPTION);
+}
+
+/*
+ * Double Unsigned Fixed to Double Floating-point
+ */
+
+int
+dbl_to_dbl_fcnvuf(
+ dbl_unsigned *srcptr,
+ unsigned int *nullptr,
+ dbl_floating_point *dstptr,
+ unsigned int *status)
+{
+ register int dst_exponent;
+ register unsigned int srcp1, srcp2, resultp1 = 0, resultp2 = 0;
+
+ Duint_copyfromptr(srcptr,srcp1,srcp2);
+
+ /* 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 0 */
+ srcp1 = srcp2 << dst_exponent+1;
+ srcp2 = 0;
+ /*
+ * 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 0 */
+ if (dst_exponent >= 0) {
+ Variable_shift_double(srcp1,srcp2,(31-dst_exponent),
+ srcp1);
+ srcp2 <<= dst_exponent+1;
+ }
+ }
+ Dbl_set_mantissap1(resultp1, srcp1 >> DBL_EXP_LENGTH);
+ Shiftdouble(srcp1,srcp2,DBL_EXP_LENGTH,resultp2);
+ Dbl_set_exponent(resultp1, (62+DBL_BIAS) - dst_exponent);
+
+ /* check for inexact */
+ if (Duint_isinexact_to_dbl(srcp2)) {
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ Dbl_increment(resultp1,resultp2);
+ break;
+ case ROUNDMINUS: /* never negative */
+ break;
+ case ROUNDNEAREST:
+ Dbl_roundnearest_from_duint(srcp2,resultp1,
+ resultp2);
+ break;
+ }
+ 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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