import the original hp sources for the spmath library w/

the a bsd-like hp licensing on 'em.
w/ many thanks to:
Mike Hibler <mike@fast.cs.utah.edu>
James Loveluck <loveluck@ri.silicomp.fr>
Patrick Roudaud <patrick@enserg.fr>

1 files changed, 396 insertions, 0 deletions

diff --git a/sys/arch/hppa/spmath/sfdiv.c b/sys/arch/hppa/spmath/sfdiv.c
new file mode 100644
index 00000000000..e6fc937f7bb
--- /dev/null
+++ b/sys/arch/hppa/spmath/sfdiv.c
@@ -0,0 +1,396 @@
+/*
+ * Copyright 1996 1995 by Open Software Foundation, Inc.   
+ *              All Rights Reserved 
+ *  
+ * Permission to use, copy, modify, and distribute this software and 
+ * its documentation for any purpose and without fee is hereby granted, 
+ * provided that the above copyright notice appears in all copies and 
+ * that both the copyright notice and this permission notice appear in 
+ * supporting documentation. 
+ *  
+ * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+ * FOR A PARTICULAR PURPOSE. 
+ *  
+ * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 
+ * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
+ * 
+ */
+/*
+ * pmk1.1
+ */
+/*
+ * (c) Copyright 1986 HEWLETT-PACKARD COMPANY
+ *
+ * To anyone who acknowledges that this file is provided "AS IS" 
+ * without any express or implied warranty:
+ *     permission to use, copy, modify, and distribute this file 
+ * for any purpose is hereby granted without fee, provided that 
+ * the above copyright notice and this notice appears in all 
+ * copies, and that the name of Hewlett-Packard Company not be 
+ * used in advertising or publicity pertaining to distribution 
+ * of the software without specific, written prior permission.  
+ * Hewlett-Packard Company makes no representations about the 
+ * suitability of this software for any purpose.
+ */
+/* $Source: /cvs/OpenBSD/src/sys/arch/hppa/spmath/sfdiv.c,v $
+ * $Revision: 1.1 $	$Author: mickey $
+ * $State: Exp $   	$Locker:  $
+ * $Date: 1998/06/23 20:34:07 $
+ */
+
+#include "../spmath/float.h"
+#include "../spmath/sgl_float.h"
+
+/*
+ *  Single Precision Floating-point Divide
+ */
+
+sgl_fdiv(srcptr1,srcptr2,dstptr,status)
+
+sgl_floating_point *srcptr1, *srcptr2, *dstptr;
+unsigned int *status;
+{
+	register unsigned int opnd1, opnd2, opnd3, result;
+	register int dest_exponent, count;
+	register boolean inexact = FALSE, guardbit = FALSE, stickybit = FALSE;
+	boolean is_tiny;
+
+	opnd1 = *srcptr1;
+	opnd2 = *srcptr2;
+	/* 
+	 * set sign bit of result 
+	 */
+	if (Sgl_sign(opnd1) ^ Sgl_sign(opnd2)) Sgl_setnegativezero(result);  
+	else Sgl_setzero(result);
+	/*
+	 * check first operand for NaN's or infinity
+	 */
+	if (Sgl_isinfinity_exponent(opnd1)) {
+		if (Sgl_iszero_mantissa(opnd1)) {
+			if (Sgl_isnotnan(opnd2)) {
+				if (Sgl_isinfinity(opnd2)) {
+					/* 
+					 * invalid since both operands 
+					 * are infinity 
+					 */
+					if (Is_invalidtrap_enabled()) 
+                                		return(INVALIDEXCEPTION);
+                                	Set_invalidflag();
+                                	Sgl_makequietnan(result);
+					*dstptr = result;
+					return(NOEXCEPTION);
+				}
+				/*
+			 	 * return infinity
+			 	 */
+				Sgl_setinfinity_exponentmantissa(result);
+				*dstptr = result;
+				return(NOEXCEPTION);
+			}
+		}
+		else {
+                	/*
+                 	 * is NaN; signaling or quiet?
+                 	 */
+                	if (Sgl_isone_signaling(opnd1)) {
+                        	/* trap if INVALIDTRAP enabled */
+                        	if (Is_invalidtrap_enabled()) 
+                            		return(INVALIDEXCEPTION);
+                        	/* make NaN quiet */
+                        	Set_invalidflag();
+                        	Sgl_set_quiet(opnd1);
+                	}
+			/* 
+			 * is second operand a signaling NaN? 
+			 */
+			else if (Sgl_is_signalingnan(opnd2)) {
+                        	/* trap if INVALIDTRAP enabled */
+                        	if (Is_invalidtrap_enabled())
+                            		return(INVALIDEXCEPTION);
+                        	/* make NaN quiet */
+                        	Set_invalidflag();
+                        	Sgl_set_quiet(opnd2);
+                		*dstptr = opnd2;
+                		return(NOEXCEPTION);
+			}
+                	/*
+                 	 * return quiet NaN
+                 	 */
+                	*dstptr = opnd1;
+                	return(NOEXCEPTION);
+		}
+	}
+	/*
+	 * check second operand for NaN's or infinity
+	 */
+	if (Sgl_isinfinity_exponent(opnd2)) {
+		if (Sgl_iszero_mantissa(opnd2)) {
+			/*
+			 * return zero
+			 */
+			Sgl_setzero_exponentmantissa(result);
+			*dstptr = result;
+			return(NOEXCEPTION);
+		}
+                /*
+                 * is NaN; signaling or quiet?
+                 */
+                if (Sgl_isone_signaling(opnd2)) {
+                        /* trap if INVALIDTRAP enabled */
+                        if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
+                        /* make NaN quiet */
+                        Set_invalidflag();
+                        Sgl_set_quiet(opnd2);
+                }
+                /*
+                 * return quiet NaN
+                 */
+                *dstptr = opnd2;
+                return(NOEXCEPTION);
+	}
+	/*
+	 * check for division by zero
+	 */
+	if (Sgl_iszero_exponentmantissa(opnd2)) {
+		if (Sgl_iszero_exponentmantissa(opnd1)) {
+			/* invalid since both operands are zero */
+			if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
+                        Set_invalidflag();
+                        Sgl_makequietnan(result);
+			*dstptr = result;
+			return(NOEXCEPTION);
+		}
+		if (Is_divisionbyzerotrap_enabled())
+                        return(DIVISIONBYZEROEXCEPTION);
+                Set_divisionbyzeroflag();
+                Sgl_setinfinity_exponentmantissa(result);
+		*dstptr = result;
+		return(NOEXCEPTION);
+	}
+	/*
+	 * Generate exponent 
+	 */
+	dest_exponent = Sgl_exponent(opnd1) - Sgl_exponent(opnd2) + SGL_BIAS;
+
+	/*
+	 * Generate mantissa
+	 */
+	if (Sgl_isnotzero_exponent(opnd1)) {
+		/* set hidden bit */
+		Sgl_clear_signexponent_set_hidden(opnd1);
+	}
+	else {
+		/* check for zero */
+		if (Sgl_iszero_mantissa(opnd1)) {
+			Sgl_setzero_exponentmantissa(result);
+			*dstptr = result;
+			return(NOEXCEPTION);
+		}
+                /* is denormalized; want to normalize */
+                Sgl_clear_signexponent(opnd1);
+                Sgl_leftshiftby1(opnd1);
+		Sgl_normalize(opnd1,dest_exponent);
+	}
+	/* opnd2 needs to have hidden bit set with msb in hidden bit */
+	if (Sgl_isnotzero_exponent(opnd2)) {
+		Sgl_clear_signexponent_set_hidden(opnd2);
+	}
+	else {
+                /* is denormalized; want to normalize */
+                Sgl_clear_signexponent(opnd2);
+                Sgl_leftshiftby1(opnd2);
+		while(Sgl_iszero_hiddenhigh7mantissa(opnd2)) {
+			Sgl_leftshiftby8(opnd2);
+			dest_exponent += 8;
+		}
+		if(Sgl_iszero_hiddenhigh3mantissa(opnd2)) {
+			Sgl_leftshiftby4(opnd2);
+			dest_exponent += 4;
+		}
+		while(Sgl_iszero_hidden(opnd2)) {
+			Sgl_leftshiftby1(opnd2);
+			dest_exponent += 1;
+		}
+	}
+
+	/* Divide the source mantissas */
+
+	/*
+	 * A non_restoring divide algorithm is used.
+	 */
+	Sgl_subtract(opnd1,opnd2,opnd1);
+	Sgl_setzero(opnd3);
+	for (count=1;count<=SGL_P && Sgl_all(opnd1);count++) {
+		Sgl_leftshiftby1(opnd1);
+		Sgl_leftshiftby1(opnd3);
+		if (Sgl_iszero_sign(opnd1)) {
+			Sgl_setone_lowmantissa(opnd3);
+			Sgl_subtract(opnd1,opnd2,opnd1);
+		}
+		else Sgl_addition(opnd1,opnd2,opnd1);
+	}
+	if (count <= SGL_P) {
+		Sgl_leftshiftby1(opnd3);
+		Sgl_setone_lowmantissa(opnd3);
+		Sgl_leftshift(opnd3,SGL_P-count);
+		if (Sgl_iszero_hidden(opnd3)) {
+			Sgl_leftshiftby1(opnd3);
+			dest_exponent--;
+		}
+	}
+	else {
+		if (Sgl_iszero_hidden(opnd3)) {
+			/* need to get one more bit of result */
+			Sgl_leftshiftby1(opnd1);
+			Sgl_leftshiftby1(opnd3);
+			if (Sgl_iszero_sign(opnd1)) {
+				Sgl_setone_lowmantissa(opnd3);
+				Sgl_subtract(opnd1,opnd2,opnd1);
+			}
+			else Sgl_addition(opnd1,opnd2,opnd1);
+			dest_exponent--;
+		}
+		if (Sgl_iszero_sign(opnd1)) guardbit = TRUE;
+		stickybit = Sgl_all(opnd1);
+	}
+	inexact = guardbit | stickybit;
+
+	/* 
+	 * round result 
+	 */
+	if (inexact && (dest_exponent > 0 || Is_underflowtrap_enabled())) {
+		Sgl_clear_signexponent(opnd3);
+		switch (Rounding_mode()) {
+			case ROUNDPLUS: 
+				if (Sgl_iszero_sign(result)) 
+					Sgl_increment_mantissa(opnd3);
+				break;
+			case ROUNDMINUS: 
+				if (Sgl_isone_sign(result)) 
+					Sgl_increment_mantissa(opnd3);
+				break;
+			case ROUNDNEAREST:
+				if (guardbit) {
+			   	if (stickybit || Sgl_isone_lowmantissa(opnd3))
+			      	    Sgl_increment_mantissa(opnd3);
+				}
+		}
+		if (Sgl_isone_hidden(opnd3)) dest_exponent++;
+	}
+	Sgl_set_mantissa(result,opnd3);
+
+        /* 
+         * Test for overflow
+         */
+	if (dest_exponent >= SGL_INFINITY_EXPONENT) {
+                /* trap if OVERFLOWTRAP enabled */
+                if (Is_overflowtrap_enabled()) {
+                        /*
+                         * Adjust bias of result
+                         */
+                        Sgl_setwrapped_exponent(result,dest_exponent,ovfl);
+                        *dstptr = result;
+                        if (inexact) 
+                            if (Is_inexacttrap_enabled())
+                                return(OVERFLOWEXCEPTION | INEXACTEXCEPTION);
+                            else Set_inexactflag();
+                        return(OVERFLOWEXCEPTION);
+                }
+		Set_overflowflag();
+                /* set result to infinity or largest number */
+		Sgl_setoverflow(result);
+		inexact = TRUE;
+	}
+        /* 
+         * Test for underflow
+         */
+	else if (dest_exponent <= 0) {
+                /* trap if UNDERFLOWTRAP enabled */
+                if (Is_underflowtrap_enabled()) {
+                        /*
+                         * Adjust bias of result
+                         */
+                        Sgl_setwrapped_exponent(result,dest_exponent,unfl);
+                        *dstptr = result;
+                        if (inexact) 
+                            if (Is_inexacttrap_enabled())
+                                return(UNDERFLOWEXCEPTION | INEXACTEXCEPTION);
+                            else Set_inexactflag();
+                        return(UNDERFLOWEXCEPTION);
+                }
+
+		/* Determine if should set underflow flag */
+		is_tiny = TRUE;
+		if (dest_exponent == 0 && inexact) {
+			switch (Rounding_mode()) {
+			case ROUNDPLUS: 
+				if (Sgl_iszero_sign(result)) {
+					Sgl_increment(opnd3);
+					if (Sgl_isone_hiddenoverflow(opnd3))
+                			    is_tiny = FALSE;
+					Sgl_decrement(opnd3);
+				}
+				break;
+			case ROUNDMINUS: 
+				if (Sgl_isone_sign(result)) {
+					Sgl_increment(opnd3);
+					if (Sgl_isone_hiddenoverflow(opnd3))
+                			    is_tiny = FALSE;
+					Sgl_decrement(opnd3);
+				}
+				break;
+			case ROUNDNEAREST:
+				if (guardbit && (stickybit || 
+				    Sgl_isone_lowmantissa(opnd3))) {
+				      	Sgl_increment(opnd3);
+					if (Sgl_isone_hiddenoverflow(opnd3))
+                			    is_tiny = FALSE;
+					Sgl_decrement(opnd3);
+				}
+				break;
+			}
+		}
+
+                /*
+                 * denormalize result or set to signed zero
+                 */
+		stickybit = inexact;
+		Sgl_denormalize(opnd3,dest_exponent,guardbit,stickybit,inexact);
+
+		/* return rounded number */ 
+		if (inexact) {
+			switch (Rounding_mode()) {
+			case ROUNDPLUS:
+				if (Sgl_iszero_sign(result)) {
+					Sgl_increment(opnd3);
+				}
+				break;
+			case ROUNDMINUS: 
+				if (Sgl_isone_sign(result))  {
+					Sgl_increment(opnd3);
+				}
+				break;
+			case ROUNDNEAREST:
+				if (guardbit && (stickybit || 
+				    Sgl_isone_lowmantissa(opnd3))) {
+			      		Sgl_increment(opnd3);
+				}
+				break;
+			}
+                	if (is_tiny) Set_underflowflag();
+                }
+		Sgl_set_exponentmantissa(result,opnd3);
+	}
+	else Sgl_set_exponent(result,dest_exponent);
+	*dstptr = result;
+	/* check for inexact */
+	if (inexact) {
+		if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
+		else  Set_inexactflag();
+	}
+	return(NOEXCEPTION);
+}