patch-2.4.20 linux-2.4.20/arch/parisc/math-emu/fcnvfut.c

• Lines: 333
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/parisc/math-emu/fcnvfut.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/parisc/math-emu/fcnvfut.c linux-2.4.20/arch/parisc/math-emu/fcnvfut.c
@@ -0,0 +1,332 @@
+/*
+ * 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/fcnvfut.c		$Revision: 1.1 $
+ *
+ *  Purpose:
+ *	Floating-point to Unsigned Fixed-point Converts with Truncation
+ *
+ *  External Interfaces:
+ *	dbl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
+ *	dbl_to_sgl_fcnvfut(srcptr,nullptr,dstptr,status)
+ *	sgl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
+ *	sgl_to_sgl_fcnvfut(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 with Truncation	*
+ ************************************************************************/
+
+/*
+ *  Convert single floating-point to single fixed-point format
+ *  with truncated result
+ */
+/*ARGSUSED*/
+int
+sgl_to_sgl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
+		    unsigned int *dstptr, unsigned int *status)
+{
+	register unsigned int src, result;
+	register int src_exponent;
+
+	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);
+		*dstptr = result;
+
+		/* check for inexact */
+		if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	else {
+		*dstptr = 0;
+
+		/* check for inexact */
+		if (Sgl_isnotzero_exponentmantissa(src)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	return(NOEXCEPTION);
+}
+
+/*
+ *  Single Floating-point to Double Unsigned Fixed 
+ */
+/*ARGSUSED*/
+int
+sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
+		    dbl_unsigned * dstptr, unsigned int *status)
+{
+	register int src_exponent;
+	register unsigned int src, resultp1, resultp2;
+
+	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);
+		Duint_copytoptr(resultp1,resultp2,dstptr);
+
+		/* check for inexact */
+		if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	else {
+		Duint_setzero(resultp1,resultp2);
+		Duint_copytoptr(resultp1,resultp2,dstptr);
+
+		/* check for inexact */
+		if (Sgl_isnotzero_exponentmantissa(src)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	return(NOEXCEPTION);
+}
+
+/*
+ *  Double Floating-point to Single Unsigned Fixed 
+ */
+/*ARGSUSED*/
+int
+dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
+		    unsigned int *dstptr, unsigned int *status)
+{
+	register unsigned int srcp1, srcp2, result;
+	register int src_exponent;
+
+	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);
+		*dstptr = result;
+
+		/* check for inexact */
+		if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	else {
+		*dstptr = 0;
+
+		/* check for inexact */
+		if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	return(NOEXCEPTION);
+}
+
+/*
+ *  Double Floating-point to Double Unsigned Fixed 
+ */
+/*ARGSUSED*/
+int
+dbl_to_dbl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
+		    dbl_unsigned * dstptr, unsigned int *status)
+{
+	register int src_exponent;
+	register unsigned int srcp1, srcp2, resultp1, resultp2;
+
+	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);
+		Duint_copytoptr(resultp1,resultp2,dstptr);
+
+		/* check for inexact */
+		if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	else {
+		Duint_setzero(resultp1,resultp2);
+		Duint_copytoptr(resultp1,resultp2,dstptr);
+
+		/* check for inexact */
+		if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
+			if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+			else Set_inexactflag();
+		}
+	}
+	return(NOEXCEPTION);
+}