summaryrefslogtreecommitdiffstats
path: root/arch/parisc/math-emu/frnd.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/parisc/math-emu/frnd.c')
-rw-r--r--arch/parisc/math-emu/frnd.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/frnd.c b/arch/parisc/math-emu/frnd.c
new file mode 100644
index 000000000000..904b3844bf26
--- /dev/null
+++ b/arch/parisc/math-emu/frnd.c
@@ -0,0 +1,252 @@
+/*
+ * 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
+ *
+ * Purpose:
+ * Single Floating-point Round to Integer
+ * Double Floating-point Round to Integer
+ * Quad Floating-point Round to Integer (returns unimplemented)
+ *
+ * External Interfaces:
+ * dbl_frnd(srcptr,nullptr,dstptr,status)
+ * sgl_frnd(srcptr,nullptr,dstptr,status)
+ *
+ * END_DESC
+*/
+
+
+#include "float.h"
+#include "sgl_float.h"
+#include "dbl_float.h"
+#include "cnv_float.h"
+
+/*
+ * Single Floating-point Round to Integer
+ */
+
+/*ARGSUSED*/
+int
+sgl_frnd(sgl_floating_point *srcptr,
+ unsigned int *nullptr,
+ sgl_floating_point *dstptr,
+ unsigned int *status)
+{
+ register unsigned int src, result;
+ register int src_exponent;
+ register boolean inexact = FALSE;
+
+ src = *srcptr;
+ /*
+ * check source operand for NaN or infinity
+ */
+ if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) {
+ /*
+ * is signaling NaN?
+ */
+ if (Sgl_isone_signaling(src)) {
+ /* trap if INVALIDTRAP enabled */
+ if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
+ /* make NaN quiet */
+ Set_invalidflag();
+ Sgl_set_quiet(src);
+ }
+ /*
+ * return quiet NaN or infinity
+ */
+ *dstptr = src;
+ return(NOEXCEPTION);
+ }
+ /*
+ * Need to round?
+ */
+ if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) {
+ *dstptr = src;
+ return(NOEXCEPTION);
+ }
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ Sgl_clear_exponent_set_hidden(src);
+ result = src;
+ Sgl_rightshift(result,(SGL_P-1) - (src_exponent));
+ /* 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)) Sgl_increment(result);
+ break;
+ case ROUNDMINUS:
+ if (Sgl_isone_sign(src)) Sgl_increment(result);
+ break;
+ case ROUNDNEAREST:
+ if (Sgl_isone_roundbit(src,src_exponent))
+ if (Sgl_isone_stickybit(src,src_exponent)
+ || (Sgl_isone_lowmantissa(result)))
+ Sgl_increment(result);
+ }
+ }
+ Sgl_leftshift(result,(SGL_P-1) - (src_exponent));
+ if (Sgl_isone_hiddenoverflow(result))
+ Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1));
+ else Sgl_set_exponent(result,src_exponent + SGL_BIAS);
+ }
+ else {
+ result = src; /* set sign */
+ Sgl_setzero_exponentmantissa(result);
+ /* check for inexact */
+ if (Sgl_isnotzero_exponentmantissa(src)) {
+ inexact = TRUE;
+ /* round result */
+ switch (Rounding_mode()) {
+ case ROUNDPLUS:
+ if (Sgl_iszero_sign(src))
+ Sgl_set_exponent(result,SGL_BIAS);
+ break;
+ case ROUNDMINUS:
+ if (Sgl_isone_sign(src))
+ Sgl_set_exponent(result,SGL_BIAS);
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Sgl_isnotzero_mantissa(src))
+ Sgl_set_exponent(result,SGL_BIAS);
+ }
+ }
+ }
+ *dstptr = result;
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
+
+/*
+ * Double Floating-point Round to Integer
+ */
+
+/*ARGSUSED*/
+int
+dbl_frnd(
+ dbl_floating_point *srcptr,
+ unsigned int *nullptr,
+ dbl_floating_point *dstptr,
+ unsigned int *status)
+{
+ register unsigned int srcp1, srcp2, resultp1, resultp2;
+ register int src_exponent;
+ register boolean inexact = FALSE;
+
+ Dbl_copyfromptr(srcptr,srcp1,srcp2);
+ /*
+ * check source operand for NaN or infinity
+ */
+ if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) {
+ /*
+ * is signaling NaN?
+ */
+ if (Dbl_isone_signaling(srcp1)) {
+ /* trap if INVALIDTRAP enabled */
+ if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
+ /* make NaN quiet */
+ Set_invalidflag();
+ Dbl_set_quiet(srcp1);
+ }
+ /*
+ * return quiet NaN or infinity
+ */
+ Dbl_copytoptr(srcp1,srcp2,dstptr);
+ return(NOEXCEPTION);
+ }
+ /*
+ * Need to round?
+ */
+ if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) {
+ Dbl_copytoptr(srcp1,srcp2,dstptr);
+ return(NOEXCEPTION);
+ }
+ /*
+ * Generate result
+ */
+ if (src_exponent >= 0) {
+ Dbl_clear_exponent_set_hidden(srcp1);
+ resultp1 = srcp1;
+ resultp2 = srcp2;
+ Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
+ /* 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))
+ Dbl_increment(resultp1,resultp2);
+ break;
+ case ROUNDMINUS:
+ if (Dbl_isone_sign(srcp1))
+ Dbl_increment(resultp1,resultp2);
+ break;
+ case ROUNDNEAREST:
+ if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
+ if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)
+ || (Dbl_isone_lowmantissap2(resultp2)))
+ Dbl_increment(resultp1,resultp2);
+ }
+ }
+ Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
+ if (Dbl_isone_hiddenoverflow(resultp1))
+ Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1));
+ else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS);
+ }
+ else {
+ resultp1 = srcp1; /* set sign */
+ Dbl_setzero_exponentmantissa(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))
+ Dbl_set_exponent(resultp1,DBL_BIAS);
+ break;
+ case ROUNDMINUS:
+ if (Dbl_isone_sign(srcp1))
+ Dbl_set_exponent(resultp1,DBL_BIAS);
+ break;
+ case ROUNDNEAREST:
+ if (src_exponent == -1)
+ if (Dbl_isnotzero_mantissa(srcp1,srcp2))
+ Dbl_set_exponent(resultp1,DBL_BIAS);
+ }
+ }
+ }
+ Dbl_copytoptr(resultp1,resultp2,dstptr);
+ if (inexact) {
+ if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+ else Set_inexactflag();
+ }
+ return(NOEXCEPTION);
+}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-04 01:37:31 +0200