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TOMOYO Linux Cross Reference
Linux/arch/parisc/math-emu/dbl_float.h

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  1 /*
  2  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
  3  *
  4  * Floating-point emulation code
  5  *  Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
  6  *
  7  *    This program is free software; you can redistribute it and/or modify
  8  *    it under the terms of the GNU General Public License as published by
  9  *    the Free Software Foundation; either version 2, or (at your option)
 10  *    any later version.
 11  *
 12  *    This program is distributed in the hope that it will be useful,
 13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  *    GNU General Public License for more details.
 16  *
 17  *    You should have received a copy of the GNU General Public License
 18  *    along with this program; if not, write to the Free Software
 19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  */
 21 #ifdef __NO_PA_HDRS
 22     PA header file -- do not include this header file for non-PA builds.
 23 #endif
 24 
 25 /* 32-bit word grabbing functions */
 26 #define Dbl_firstword(value) Dallp1(value)
 27 #define Dbl_secondword(value) Dallp2(value)
 28 #define Dbl_thirdword(value) dummy_location
 29 #define Dbl_fourthword(value) dummy_location
 30 
 31 #define Dbl_sign(object) Dsign(object)
 32 #define Dbl_exponent(object) Dexponent(object)
 33 #define Dbl_signexponent(object) Dsignexponent(object)
 34 #define Dbl_mantissap1(object) Dmantissap1(object)
 35 #define Dbl_mantissap2(object) Dmantissap2(object)
 36 #define Dbl_exponentmantissap1(object) Dexponentmantissap1(object)
 37 #define Dbl_allp1(object) Dallp1(object)
 38 #define Dbl_allp2(object) Dallp2(object)
 39 
 40 /* dbl_and_signs ANDs the sign bits of each argument and puts the result
 41  * into the first argument. dbl_or_signs ors those same sign bits */
 42 #define Dbl_and_signs( src1dst, src2)           \
 43     Dallp1(src1dst) = (Dallp1(src2)|~((unsigned int)1<<31)) & Dallp1(src1dst)
 44 #define Dbl_or_signs( src1dst, src2)            \
 45     Dallp1(src1dst) = (Dallp1(src2)&((unsigned int)1<<31)) | Dallp1(src1dst)
 46 
 47 /* The hidden bit is always the low bit of the exponent */
 48 #define Dbl_clear_exponent_set_hidden(srcdst) Deposit_dexponent(srcdst,1)
 49 #define Dbl_clear_signexponent_set_hidden(srcdst) \
 50     Deposit_dsignexponent(srcdst,1)
 51 #define Dbl_clear_sign(srcdst) Dallp1(srcdst) &= ~((unsigned int)1<<31)
 52 #define Dbl_clear_signexponent(srcdst) \
 53     Dallp1(srcdst) &= Dmantissap1((unsigned int)-1)
 54 
 55 /* Exponent field for doubles has already been cleared and may be
 56  * included in the shift.  Here we need to generate two double width
 57  * variable shifts.  The insignificant bits can be ignored.
 58  *      MTSAR f(varamount)
 59  *      VSHD    srcdst.high,srcdst.low => srcdst.low
 60  *      VSHD    0,srcdst.high => srcdst.high 
 61  * This is very difficult to model with C expressions since the shift amount
 62  * could exceed 32.  */
 63 /* varamount must be less than 64 */
 64 #define Dbl_rightshift(srcdstA, srcdstB, varamount)                     \
 65     {if((varamount) >= 32) {                                            \
 66         Dallp2(srcdstB) = Dallp1(srcdstA) >> (varamount-32);            \
 67         Dallp1(srcdstA)=0;                                              \
 68     }                                                                   \
 69     else if(varamount > 0) {                                            \
 70         Variable_shift_double(Dallp1(srcdstA), Dallp2(srcdstB),         \
 71           (varamount), Dallp2(srcdstB));                                \
 72         Dallp1(srcdstA) >>= varamount;                                  \
 73     } }
 74 /* varamount must be less than 64 */
 75 #define Dbl_rightshift_exponentmantissa(srcdstA, srcdstB, varamount)    \
 76     {if((varamount) >= 32) {                                            \
 77         Dallp2(srcdstB) = Dexponentmantissap1(srcdstA) >> (varamount-32); \
 78         Dallp1(srcdstA) &= ((unsigned int)1<<31);  /* clear expmant field */ \
 79     }                                                                   \
 80     else if(varamount > 0) {                                            \
 81         Variable_shift_double(Dexponentmantissap1(srcdstA), Dallp2(srcdstB), \
 82         (varamount), Dallp2(srcdstB));                                  \
 83         Deposit_dexponentmantissap1(srcdstA,                            \
 84             (Dexponentmantissap1(srcdstA)>>varamount));                 \
 85     } }
 86 /* varamount must be less than 64 */
 87 #define Dbl_leftshift(srcdstA, srcdstB, varamount)                      \
 88     {if((varamount) >= 32) {                                            \
 89         Dallp1(srcdstA) = Dallp2(srcdstB) << (varamount-32);            \
 90         Dallp2(srcdstB)=0;                                              \
 91     }                                                                   \
 92     else {                                                              \
 93         if ((varamount) > 0) {                                          \
 94             Dallp1(srcdstA) = (Dallp1(srcdstA) << (varamount)) |        \
 95                 (Dallp2(srcdstB) >> (32-(varamount)));                  \
 96             Dallp2(srcdstB) <<= varamount;                              \
 97         }                                                               \
 98     } }
 99 #define Dbl_leftshiftby1_withextent(lefta,leftb,right,resulta,resultb)  \
100     Shiftdouble(Dallp1(lefta), Dallp2(leftb), 31, Dallp1(resulta));     \
101     Shiftdouble(Dallp2(leftb), Extall(right), 31, Dallp2(resultb)) 
102     
103 #define Dbl_rightshiftby1_withextent(leftb,right,dst)           \
104     Extall(dst) = (Dallp2(leftb) << 31) | ((unsigned int)Extall(right) >> 1) | \
105                   Extlow(right)
106 
107 #define Dbl_arithrightshiftby1(srcdstA,srcdstB)                 \
108     Shiftdouble(Dallp1(srcdstA),Dallp2(srcdstB),1,Dallp2(srcdstB));\
109     Dallp1(srcdstA) = (int)Dallp1(srcdstA) >> 1
110    
111 /* Sign extend the sign bit with an integer destination */
112 #define Dbl_signextendedsign(value)  Dsignedsign(value)
113 
114 #define Dbl_isone_hidden(dbl_value) (Is_dhidden(dbl_value)!=0)
115 /* Singles and doubles may include the sign and exponent fields.  The
116  * hidden bit and the hidden overflow must be included. */
117 #define Dbl_increment(dbl_valueA,dbl_valueB) \
118     if( (Dallp2(dbl_valueB) += 1) == 0 )  Dallp1(dbl_valueA) += 1
119 #define Dbl_increment_mantissa(dbl_valueA,dbl_valueB) \
120     if( (Dmantissap2(dbl_valueB) += 1) == 0 )  \
121     Deposit_dmantissap1(dbl_valueA,dbl_valueA+1)
122 #define Dbl_decrement(dbl_valueA,dbl_valueB) \
123     if( Dallp2(dbl_valueB) == 0 )  Dallp1(dbl_valueA) -= 1; \
124     Dallp2(dbl_valueB) -= 1
125 
126 #define Dbl_isone_sign(dbl_value) (Is_dsign(dbl_value)!=0)
127 #define Dbl_isone_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)!=0)
128 #define Dbl_isone_lowmantissap1(dbl_valueA) (Is_dlowp1(dbl_valueA)!=0)
129 #define Dbl_isone_lowmantissap2(dbl_valueB) (Is_dlowp2(dbl_valueB)!=0)
130 #define Dbl_isone_signaling(dbl_value) (Is_dsignaling(dbl_value)!=0)
131 #define Dbl_is_signalingnan(dbl_value) (Dsignalingnan(dbl_value)==0xfff)
132 #define Dbl_isnotzero(dbl_valueA,dbl_valueB) \
133     (Dallp1(dbl_valueA) || Dallp2(dbl_valueB))
134 #define Dbl_isnotzero_hiddenhigh7mantissa(dbl_value) \
135     (Dhiddenhigh7mantissa(dbl_value)!=0)
136 #define Dbl_isnotzero_exponent(dbl_value) (Dexponent(dbl_value)!=0)
137 #define Dbl_isnotzero_mantissa(dbl_valueA,dbl_valueB) \
138     (Dmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
139 #define Dbl_isnotzero_mantissap1(dbl_valueA) (Dmantissap1(dbl_valueA)!=0)
140 #define Dbl_isnotzero_mantissap2(dbl_valueB) (Dmantissap2(dbl_valueB)!=0)
141 #define Dbl_isnotzero_exponentmantissa(dbl_valueA,dbl_valueB) \
142     (Dexponentmantissap1(dbl_valueA) || Dmantissap2(dbl_valueB))
143 #define Dbl_isnotzero_low4p2(dbl_value) (Dlow4p2(dbl_value)!=0)
144 #define Dbl_iszero(dbl_valueA,dbl_valueB) (Dallp1(dbl_valueA)==0 && \
145     Dallp2(dbl_valueB)==0)
146 #define Dbl_iszero_allp1(dbl_value) (Dallp1(dbl_value)==0)
147 #define Dbl_iszero_allp2(dbl_value) (Dallp2(dbl_value)==0)
148 #define Dbl_iszero_hidden(dbl_value) (Is_dhidden(dbl_value)==0)
149 #define Dbl_iszero_hiddenoverflow(dbl_value) (Is_dhiddenoverflow(dbl_value)==0)
150 #define Dbl_iszero_hiddenhigh3mantissa(dbl_value) \
151     (Dhiddenhigh3mantissa(dbl_value)==0)
152 #define Dbl_iszero_hiddenhigh7mantissa(dbl_value) \
153     (Dhiddenhigh7mantissa(dbl_value)==0)
154 #define Dbl_iszero_sign(dbl_value) (Is_dsign(dbl_value)==0)
155 #define Dbl_iszero_exponent(dbl_value) (Dexponent(dbl_value)==0)
156 #define Dbl_iszero_mantissa(dbl_valueA,dbl_valueB) \
157     (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
158 #define Dbl_iszero_exponentmantissa(dbl_valueA,dbl_valueB) \
159     (Dexponentmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
160 #define Dbl_isinfinity_exponent(dbl_value)              \
161     (Dexponent(dbl_value)==DBL_INFINITY_EXPONENT)
162 #define Dbl_isnotinfinity_exponent(dbl_value)           \
163     (Dexponent(dbl_value)!=DBL_INFINITY_EXPONENT)
164 #define Dbl_isinfinity(dbl_valueA,dbl_valueB)                   \
165     (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&    \
166     Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0)
167 #define Dbl_isnan(dbl_valueA,dbl_valueB)                \
168     (Dexponent(dbl_valueA)==DBL_INFINITY_EXPONENT &&    \
169     (Dmantissap1(dbl_valueA)!=0 || Dmantissap2(dbl_valueB)!=0))
170 #define Dbl_isnotnan(dbl_valueA,dbl_valueB)             \
171     (Dexponent(dbl_valueA)!=DBL_INFINITY_EXPONENT ||    \
172     (Dmantissap1(dbl_valueA)==0 && Dmantissap2(dbl_valueB)==0))
173 
174 #define Dbl_islessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)     \
175     (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                     \
176      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
177       Dallp2(dbl_op1b) < Dallp2(dbl_op2b)))
178 #define Dbl_isgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)  \
179     (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                     \
180      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
181       Dallp2(dbl_op1b) > Dallp2(dbl_op2b)))
182 #define Dbl_isnotlessthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)  \
183     (Dallp1(dbl_op1a) > Dallp1(dbl_op2a) ||                     \
184      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
185       Dallp2(dbl_op1b) >= Dallp2(dbl_op2b)))
186 #define Dbl_isnotgreaterthan(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b) \
187     (Dallp1(dbl_op1a) < Dallp1(dbl_op2a) ||                     \
188      (Dallp1(dbl_op1a) == Dallp1(dbl_op2a) &&                   \
189       Dallp2(dbl_op1b) <= Dallp2(dbl_op2b)))
190 #define Dbl_isequal(dbl_op1a,dbl_op1b,dbl_op2a,dbl_op2b)        \
191      ((Dallp1(dbl_op1a) == Dallp1(dbl_op2a)) &&                 \
192       (Dallp2(dbl_op1b) == Dallp2(dbl_op2b)))
193 
194 #define Dbl_leftshiftby8(dbl_valueA,dbl_valueB) \
195     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),24,Dallp1(dbl_valueA)); \
196     Dallp2(dbl_valueB) <<= 8
197 #define Dbl_leftshiftby7(dbl_valueA,dbl_valueB) \
198     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),25,Dallp1(dbl_valueA)); \
199     Dallp2(dbl_valueB) <<= 7
200 #define Dbl_leftshiftby4(dbl_valueA,dbl_valueB) \
201     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),28,Dallp1(dbl_valueA)); \
202     Dallp2(dbl_valueB) <<= 4
203 #define Dbl_leftshiftby3(dbl_valueA,dbl_valueB) \
204     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),29,Dallp1(dbl_valueA)); \
205     Dallp2(dbl_valueB) <<= 3
206 #define Dbl_leftshiftby2(dbl_valueA,dbl_valueB) \
207     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),30,Dallp1(dbl_valueA)); \
208     Dallp2(dbl_valueB) <<= 2
209 #define Dbl_leftshiftby1(dbl_valueA,dbl_valueB) \
210     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),31,Dallp1(dbl_valueA)); \
211     Dallp2(dbl_valueB) <<= 1
212 
213 #define Dbl_rightshiftby8(dbl_valueA,dbl_valueB) \
214     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),8,Dallp2(dbl_valueB)); \
215     Dallp1(dbl_valueA) >>= 8
216 #define Dbl_rightshiftby4(dbl_valueA,dbl_valueB) \
217     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),4,Dallp2(dbl_valueB)); \
218     Dallp1(dbl_valueA) >>= 4
219 #define Dbl_rightshiftby2(dbl_valueA,dbl_valueB) \
220     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),2,Dallp2(dbl_valueB)); \
221     Dallp1(dbl_valueA) >>= 2
222 #define Dbl_rightshiftby1(dbl_valueA,dbl_valueB) \
223     Shiftdouble(Dallp1(dbl_valueA),Dallp2(dbl_valueB),1,Dallp2(dbl_valueB)); \
224     Dallp1(dbl_valueA) >>= 1
225     
226 /* This magnitude comparison uses the signless first words and
227  * the regular part2 words.  The comparison is graphically:
228  *
229  *       1st greater?  -------------
230  *                                 |
231  *       1st less?-----------------+---------
232  *                                 |        |
233  *       2nd greater or equal----->|        |
234  *                               False     True
235  */
236 #define Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)    \
237       ((signlessleft <= signlessright) &&                               \
238        ( (signlessleft < signlessright) || (Dallp2(leftB)<Dallp2(rightB)) ))
239     
240 #define Dbl_copytoint_exponentmantissap1(src,dest) \
241     dest = Dexponentmantissap1(src)
242 
243 /* A quiet NaN has the high mantissa bit clear and at least on other (in this
244  * case the adjacent bit) bit set. */
245 #define Dbl_set_quiet(dbl_value) Deposit_dhigh2mantissa(dbl_value,1)
246 #define Dbl_set_exponent(dbl_value, exp) Deposit_dexponent(dbl_value,exp)
247 
248 #define Dbl_set_mantissa(desta,destb,valuea,valueb)     \
249     Deposit_dmantissap1(desta,valuea);                  \
250     Dmantissap2(destb) = Dmantissap2(valueb)
251 #define Dbl_set_mantissap1(desta,valuea)                \
252     Deposit_dmantissap1(desta,valuea)
253 #define Dbl_set_mantissap2(destb,valueb)                \
254     Dmantissap2(destb) = Dmantissap2(valueb)
255 
256 #define Dbl_set_exponentmantissa(desta,destb,valuea,valueb)     \
257     Deposit_dexponentmantissap1(desta,valuea);                  \
258     Dmantissap2(destb) = Dmantissap2(valueb)
259 #define Dbl_set_exponentmantissap1(dest,value)                  \
260     Deposit_dexponentmantissap1(dest,value)
261 
262 #define Dbl_copyfromptr(src,desta,destb) \
263     Dallp1(desta) = src->wd0;           \
264     Dallp2(destb) = src->wd1 
265 #define Dbl_copytoptr(srca,srcb,dest)   \
266     dest->wd0 = Dallp1(srca);           \
267     dest->wd1 = Dallp2(srcb)
268 
269 /*  An infinity is represented with the max exponent and a zero mantissa */
270 #define Dbl_setinfinity_exponent(dbl_value) \
271     Deposit_dexponent(dbl_value,DBL_INFINITY_EXPONENT)
272 #define Dbl_setinfinity_exponentmantissa(dbl_valueA,dbl_valueB) \
273     Deposit_dexponentmantissap1(dbl_valueA,                     \
274     (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH))));        \
275     Dmantissap2(dbl_valueB) = 0
276 #define Dbl_setinfinitypositive(dbl_valueA,dbl_valueB)          \
277     Dallp1(dbl_valueA)                                          \
278         = (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));   \
279     Dmantissap2(dbl_valueB) = 0
280 #define Dbl_setinfinitynegative(dbl_valueA,dbl_valueB)          \
281     Dallp1(dbl_valueA) = ((unsigned int)1<<31) |                \
282          (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));    \
283     Dmantissap2(dbl_valueB) = 0
284 #define Dbl_setinfinity(dbl_valueA,dbl_valueB,sign)             \
285     Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |           \
286         (DBL_INFINITY_EXPONENT << (32-(1+DBL_EXP_LENGTH)));     \
287     Dmantissap2(dbl_valueB) = 0
288 
289 #define Dbl_sethigh4bits(dbl_value, extsign) Deposit_dhigh4p1(dbl_value,extsign)
290 #define Dbl_set_sign(dbl_value,sign) Deposit_dsign(dbl_value,sign)
291 #define Dbl_invert_sign(dbl_value) Deposit_dsign(dbl_value,~Dsign(dbl_value))
292 #define Dbl_setone_sign(dbl_value) Deposit_dsign(dbl_value,1)
293 #define Dbl_setone_lowmantissap2(dbl_value) Deposit_dlowp2(dbl_value,1)
294 #define Dbl_setzero_sign(dbl_value) Dallp1(dbl_value) &= 0x7fffffff
295 #define Dbl_setzero_exponent(dbl_value)                 \
296     Dallp1(dbl_value) &= 0x800fffff
297 #define Dbl_setzero_mantissa(dbl_valueA,dbl_valueB)     \
298     Dallp1(dbl_valueA) &= 0xfff00000;                   \
299     Dallp2(dbl_valueB) = 0
300 #define Dbl_setzero_mantissap1(dbl_value) Dallp1(dbl_value) &= 0xfff00000
301 #define Dbl_setzero_mantissap2(dbl_value) Dallp2(dbl_value) = 0
302 #define Dbl_setzero_exponentmantissa(dbl_valueA,dbl_valueB)     \
303     Dallp1(dbl_valueA) &= 0x80000000;           \
304     Dallp2(dbl_valueB) = 0
305 #define Dbl_setzero_exponentmantissap1(dbl_valueA)      \
306     Dallp1(dbl_valueA) &= 0x80000000
307 #define Dbl_setzero(dbl_valueA,dbl_valueB) \
308     Dallp1(dbl_valueA) = 0; Dallp2(dbl_valueB) = 0
309 #define Dbl_setzerop1(dbl_value) Dallp1(dbl_value) = 0
310 #define Dbl_setzerop2(dbl_value) Dallp2(dbl_value) = 0
311 #define Dbl_setnegativezero(dbl_value) \
312     Dallp1(dbl_value) = (unsigned int)1 << 31; Dallp2(dbl_value) = 0
313 #define Dbl_setnegativezerop1(dbl_value) Dallp1(dbl_value) = (unsigned int)1<<31
314 
315 /* Use the following macro for both overflow & underflow conditions */
316 #define ovfl -
317 #define unfl +
318 #define Dbl_setwrapped_exponent(dbl_value,exponent,op) \
319     Deposit_dexponent(dbl_value,(exponent op DBL_WRAP))
320 
321 #define Dbl_setlargestpositive(dbl_valueA,dbl_valueB)                   \
322     Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
323                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 );          \
324     Dallp2(dbl_valueB) = 0xFFFFFFFF
325 #define Dbl_setlargestnegative(dbl_valueA,dbl_valueB)                   \
326     Dallp1(dbl_valueA) = ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) \
327                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )           \
328                         | ((unsigned int)1<<31);                        \
329     Dallp2(dbl_valueB) = 0xFFFFFFFF
330 #define Dbl_setlargest_exponentmantissa(dbl_valueA,dbl_valueB)          \
331     Deposit_dexponentmantissap1(dbl_valueA,                             \
332         (((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH)))               \
333                         | ((1<<(32-(1+DBL_EXP_LENGTH))) - 1 )));        \
334     Dallp2(dbl_valueB) = 0xFFFFFFFF
335 
336 #define Dbl_setnegativeinfinity(dbl_valueA,dbl_valueB)                  \
337     Dallp1(dbl_valueA) = ((1<<DBL_EXP_LENGTH) | DBL_INFINITY_EXPONENT)  \
338                          << (32-(1+DBL_EXP_LENGTH)) ;                   \
339     Dallp2(dbl_valueB) = 0
340 #define Dbl_setlargest(dbl_valueA,dbl_valueB,sign)                      \
341     Dallp1(dbl_valueA) = ((unsigned int)sign << 31) |                   \
342          ((DBL_EMAX+DBL_BIAS) << (32-(1+DBL_EXP_LENGTH))) |             \
343          ((1 << (32-(1+DBL_EXP_LENGTH))) - 1 );                         \
344     Dallp2(dbl_valueB) = 0xFFFFFFFF
345     
346 
347 /* The high bit is always zero so arithmetic or logical shifts will work. */
348 #define Dbl_right_align(srcdstA,srcdstB,shift,extent)                   \
349     if( shift >= 32 )                                                   \
350         {                                                               \
351         /* Big shift requires examining the portion shift off           \
352         the end to properly set inexact.  */                            \
353         if(shift < 64)                                                  \
354             {                                                           \
355             if(shift > 32)                                              \
356                 {                                                       \
357                 Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),  \
358                  shift-32, Extall(extent));                             \
359                 if(Dallp2(srcdstB) << 64 - (shift)) Ext_setone_low(extent); \
360                 }                                                       \
361             else Extall(extent) = Dallp2(srcdstB);                      \
362             Dallp2(srcdstB) = Dallp1(srcdstA) >> (shift - 32);          \
363             }                                                           \
364         else                                                            \
365             {                                                           \
366             Extall(extent) = Dallp1(srcdstA);                           \
367             if(Dallp2(srcdstB)) Ext_setone_low(extent);                 \
368             Dallp2(srcdstB) = 0;                                        \
369             }                                                           \
370         Dallp1(srcdstA) = 0;                                            \
371         }                                                               \
372     else                                                                \
373         {                                                               \
374         /* Small alignment is simpler.  Extension is easily set. */     \
375         if (shift > 0)                                                  \
376             {                                                           \
377             Extall(extent) = Dallp2(srcdstB) << 32 - (shift);           \
378             Variable_shift_double(Dallp1(srcdstA),Dallp2(srcdstB),shift, \
379              Dallp2(srcdstB));                                          \
380             Dallp1(srcdstA) >>= shift;                                  \
381             }                                                           \
382         else Extall(extent) = 0;                                        \
383         }
384 
385 /* 
386  * Here we need to shift the result right to correct for an overshift
387  * (due to the exponent becoming negative) during normalization.
388  */
389 #define Dbl_fix_overshift(srcdstA,srcdstB,shift,extent)                 \
390             Extall(extent) = Dallp2(srcdstB) << 32 - (shift);           \
391             Dallp2(srcdstB) = (Dallp1(srcdstA) << 32 - (shift)) |       \
392                 (Dallp2(srcdstB) >> (shift));                           \
393             Dallp1(srcdstA) = Dallp1(srcdstA) >> shift
394 
395 #define Dbl_hiddenhigh3mantissa(dbl_value) Dhiddenhigh3mantissa(dbl_value)
396 #define Dbl_hidden(dbl_value) Dhidden(dbl_value)
397 #define Dbl_lowmantissap2(dbl_value) Dlowp2(dbl_value)
398 
399 /* The left argument is never smaller than the right argument */
400 #define Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb)                 \
401     if( Dallp2(rightb) > Dallp2(leftb) ) Dallp1(lefta)--;       \
402     Dallp2(resultb) = Dallp2(leftb) - Dallp2(rightb);           \
403     Dallp1(resulta) = Dallp1(lefta) - Dallp1(righta)
404 
405 /* Subtract right augmented with extension from left augmented with zeros and
406  * store into result and extension. */
407 #define Dbl_subtract_withextension(lefta,leftb,righta,rightb,extent,resulta,resultb)    \
408     Dbl_subtract(lefta,leftb,righta,rightb,resulta,resultb);            \
409     if( (Extall(extent) = 0-Extall(extent)) )                           \
410         {                                                               \
411         if((Dallp2(resultb)--) == 0) Dallp1(resulta)--;                 \
412         }
413 
414 #define Dbl_addition(lefta,leftb,righta,rightb,resulta,resultb)         \
415     /* If the sum of the low words is less than either source, then     \
416      * an overflow into the next word occurred. */                      \
417     Dallp1(resulta) = Dallp1(lefta) + Dallp1(righta);                   \
418     if((Dallp2(resultb) = Dallp2(leftb) + Dallp2(rightb)) < Dallp2(rightb)) \
419         Dallp1(resulta)++
420 
421 #define Dbl_xortointp1(left,right,result)                       \
422     result = Dallp1(left) XOR Dallp1(right)
423 
424 #define Dbl_xorfromintp1(left,right,result)                     \
425     Dallp1(result) = left XOR Dallp1(right)
426 
427 #define Dbl_swap_lower(left,right)                              \
428     Dallp2(left)  = Dallp2(left) XOR Dallp2(right);             \
429     Dallp2(right) = Dallp2(left) XOR Dallp2(right);             \
430     Dallp2(left)  = Dallp2(left) XOR Dallp2(right)
431 
432 /* Need to Initialize */
433 #define Dbl_makequietnan(desta,destb)                                   \
434     Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
435                  | (1<<(32-(1+DBL_EXP_LENGTH+2)));                      \
436     Dallp2(destb) = 0
437 #define Dbl_makesignalingnan(desta,destb)                               \
438     Dallp1(desta) = ((DBL_EMAX+DBL_BIAS)+1)<< (32-(1+DBL_EXP_LENGTH))   \
439                  | (1<<(32-(1+DBL_EXP_LENGTH+1)));                      \
440     Dallp2(destb) = 0
441 
442 #define Dbl_normalize(dbl_opndA,dbl_opndB,exponent)                     \
443         while(Dbl_iszero_hiddenhigh7mantissa(dbl_opndA)) {              \
444                 Dbl_leftshiftby8(dbl_opndA,dbl_opndB);                  \
445                 exponent -= 8;                                          \
446         }                                                               \
447         if(Dbl_iszero_hiddenhigh3mantissa(dbl_opndA)) {                 \
448                 Dbl_leftshiftby4(dbl_opndA,dbl_opndB);                  \
449                 exponent -= 4;                                          \
450         }                                                               \
451         while(Dbl_iszero_hidden(dbl_opndA)) {                           \
452                 Dbl_leftshiftby1(dbl_opndA,dbl_opndB);                  \
453                 exponent -= 1;                                          \
454         }
455 
456 #define Twoword_add(src1dstA,src1dstB,src2A,src2B)              \
457         /*                                                      \
458          * want this macro to generate:                         \
459          *      ADD     src1dstB,src2B,src1dstB;                \
460          *      ADDC    src1dstA,src2A,src1dstA;                \
461          */                                                     \
462         if ((src1dstB) + (src2B) < (src1dstB)) Dallp1(src1dstA)++; \
463         Dallp1(src1dstA) += (src2A);                            \
464         Dallp2(src1dstB) += (src2B)
465 
466 #define Twoword_subtract(src1dstA,src1dstB,src2A,src2B)         \
467         /*                                                      \
468          * want this macro to generate:                         \
469          *      SUB     src1dstB,src2B,src1dstB;                \
470          *      SUBB    src1dstA,src2A,src1dstA;                \
471          */                                                     \
472         if ((src1dstB) < (src2B)) Dallp1(src1dstA)--;           \
473         Dallp1(src1dstA) -= (src2A);                            \
474         Dallp2(src1dstB) -= (src2B)
475 
476 #define Dbl_setoverflow(resultA,resultB)                                \
477         /* set result to infinity or largest number */                  \
478         switch (Rounding_mode()) {                                      \
479                 case ROUNDPLUS:                                         \
480                         if (Dbl_isone_sign(resultA)) {                  \
481                                 Dbl_setlargestnegative(resultA,resultB); \
482                         }                                               \
483                         else {                                          \
484                                 Dbl_setinfinitypositive(resultA,resultB); \
485                         }                                               \
486                         break;                                          \
487                 case ROUNDMINUS:                                        \
488                         if (Dbl_iszero_sign(resultA)) {                 \
489                                 Dbl_setlargestpositive(resultA,resultB); \
490                         }                                               \
491                         else {                                          \
492                                 Dbl_setinfinitynegative(resultA,resultB); \
493                         }                                               \
494                         break;                                          \
495                 case ROUNDNEAREST:                                      \
496                         Dbl_setinfinity_exponentmantissa(resultA,resultB); \
497                         break;                                          \
498                 case ROUNDZERO:                                         \
499                         Dbl_setlargest_exponentmantissa(resultA,resultB); \
500         }
501 
502 #define Dbl_denormalize(opndp1,opndp2,exponent,guard,sticky,inexact)    \
503     Dbl_clear_signexponent_set_hidden(opndp1);                          \
504     if (exponent >= (1-DBL_P)) {                                        \
505         if (exponent >= -31) {                                          \
506             guard = (Dallp2(opndp2) >> -exponent) & 1;                  \
507             if (exponent < 0) sticky |= Dallp2(opndp2) << (32+exponent); \
508             if (exponent > -31) {                                       \
509                 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
510                 Dallp1(opndp1) >>= 1-exponent;                          \
511             }                                                           \
512             else {                                                      \
513                 Dallp2(opndp2) = Dallp1(opndp1);                        \
514                 Dbl_setzerop1(opndp1);                                  \
515             }                                                           \
516         }                                                               \
517         else {                                                          \
518             guard = (Dallp1(opndp1) >> -32-exponent) & 1;               \
519             if (exponent == -32) sticky |= Dallp2(opndp2);              \
520             else sticky |= (Dallp2(opndp2) | Dallp1(opndp1) << 64+exponent); \
521             Dallp2(opndp2) = Dallp1(opndp1) >> -31-exponent;            \
522             Dbl_setzerop1(opndp1);                                      \
523         }                                                               \
524         inexact = guard | sticky;                                       \
525     }                                                                   \
526     else {                                                              \
527         guard = 0;                                                      \
528         sticky |= (Dallp1(opndp1) | Dallp2(opndp2));                    \
529         Dbl_setzero(opndp1,opndp2);                                     \
530         inexact = sticky;                                               \
531     }
532 
533 /* 
534  * The fused multiply add instructions requires a double extended format,
535  * with 106 bits of mantissa.
536  */
537 #define DBLEXT_THRESHOLD 106
538 
539 #define Dblext_setzero(valA,valB,valC,valD)     \
540     Dextallp1(valA) = 0; Dextallp2(valB) = 0;   \
541     Dextallp3(valC) = 0; Dextallp4(valD) = 0
542 
543 
544 #define Dblext_isnotzero_mantissap3(valC) (Dextallp3(valC)!=0)
545 #define Dblext_isnotzero_mantissap4(valD) (Dextallp3(valD)!=0)
546 #define Dblext_isone_lowp2(val) (Dextlowp2(val)!=0)
547 #define Dblext_isone_highp3(val) (Dexthighp3(val)!=0)
548 #define Dblext_isnotzero_low31p3(val) (Dextlow31p3(val)!=0)
549 #define Dblext_iszero(valA,valB,valC,valD) (Dextallp1(valA)==0 && \
550     Dextallp2(valB)==0 && Dextallp3(valC)==0 && Dextallp4(valD)==0)
551 
552 #define Dblext_copy(srca,srcb,srcc,srcd,desta,destb,destc,destd) \
553     Dextallp1(desta) = Dextallp4(srca); \
554     Dextallp2(destb) = Dextallp4(srcb); \
555     Dextallp3(destc) = Dextallp4(srcc); \
556     Dextallp4(destd) = Dextallp4(srcd)
557 
558 #define Dblext_swap_lower(leftp2,leftp3,leftp4,rightp2,rightp3,rightp4)  \
559     Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
560     Dextallp2(rightp2) = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
561     Dextallp2(leftp2)  = Dextallp2(leftp2) XOR Dextallp2(rightp2);  \
562     Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
563     Dextallp3(rightp3) = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
564     Dextallp3(leftp3)  = Dextallp3(leftp3) XOR Dextallp3(rightp3);  \
565     Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
566     Dextallp4(rightp4) = Dextallp4(leftp4) XOR Dextallp4(rightp4);  \
567     Dextallp4(leftp4)  = Dextallp4(leftp4) XOR Dextallp4(rightp4)
568 
569 #define Dblext_setone_lowmantissap4(dbl_value) Deposit_dextlowp4(dbl_value,1)
570 
571 /* The high bit is always zero so arithmetic or logical shifts will work. */
572 #define Dblext_right_align(srcdstA,srcdstB,srcdstC,srcdstD,shift) \
573   {int shiftamt, sticky;                                                \
574     shiftamt = shift % 32;                                              \
575     sticky = 0;                                                         \
576     switch (shift/32) {                                                 \
577      case 0: if (shiftamt > 0) {                                        \
578                 sticky = Dextallp4(srcdstD) << 32 - (shiftamt);         \
579                 Variable_shift_double(Dextallp3(srcdstC),               \
580                  Dextallp4(srcdstD),shiftamt,Dextallp4(srcdstD));       \
581                 Variable_shift_double(Dextallp2(srcdstB),               \
582                  Dextallp3(srcdstC),shiftamt,Dextallp3(srcdstC));       \
583                 Variable_shift_double(Dextallp1(srcdstA),               \
584                  Dextallp2(srcdstB),shiftamt,Dextallp2(srcdstB));       \
585                 Dextallp1(srcdstA) >>= shiftamt;                        \
586              }                                                          \
587              break;                                                     \
588      case 1: if (shiftamt > 0) {                                        \
589                 sticky = (Dextallp3(srcdstC) << 31 - shiftamt) |        \
590                          Dextallp4(srcdstD);                            \
591                 Variable_shift_double(Dextallp2(srcdstB),               \
592                  Dextallp3(srcdstC),shiftamt,Dextallp4(srcdstD));       \
593                 Variable_shift_double(Dextallp1(srcdstA),               \
594                  Dextallp2(srcdstB),shiftamt,Dextallp3(srcdstC));       \
595              }                                                          \
596              else {                                                     \
597                 sticky = Dextallp4(srcdstD);                            \
598                 Dextallp4(srcdstD) = Dextallp3(srcdstC);                \
599                 Dextallp3(srcdstC) = Dextallp2(srcdstB);                \
600              }                                                          \
601              Dextallp2(srcdstB) = Dextallp1(srcdstA) >> shiftamt;       \
602              Dextallp1(srcdstA) = 0;                                    \
603              break;                                                     \
604      case 2: if (shiftamt > 0) {                                        \
605                 sticky = (Dextallp2(srcdstB) << 31 - shiftamt) |        \
606                          Dextallp3(srcdstC) | Dextallp4(srcdstD);       \
607                 Variable_shift_double(Dextallp1(srcdstA),               \
608                  Dextallp2(srcdstB),shiftamt,Dextallp4(srcdstD));       \
609              }                                                          \
610              else {                                                     \
611                 sticky = Dextallp3(srcdstC) | Dextallp4(srcdstD);       \
612                 Dextallp4(srcdstD) = Dextallp2(srcdstB);                \
613              }                                                          \
614              Dextallp3(srcdstC) = Dextallp1(srcdstA) >> shiftamt;       \
615              Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;               \
616              break;                                                     \
617      case 3: if (shiftamt > 0) {                                        \
618                 sticky = (Dextallp1(srcdstA) << 31 - shiftamt) |        \
619                          Dextallp2(srcdstB) | Dextallp3(srcdstC) |      \
620                          Dextallp4(srcdstD);                            \
621              }                                                          \
622              else {                                                     \
623                 sticky = Dextallp2(srcdstB) | Dextallp3(srcdstC) |      \
624                     Dextallp4(srcdstD);                                 \
625              }                                                          \
626              Dextallp4(srcdstD) = Dextallp1(srcdstA) >> shiftamt;       \
627              Dextallp1(srcdstA) = Dextallp2(srcdstB) = 0;               \
628              Dextallp3(srcdstC) = 0;                                    \
629              break;                                                     \
630     }                                                                   \
631     if (sticky) Dblext_setone_lowmantissap4(srcdstD);                   \
632   }
633 
634 /* The left argument is never smaller than the right argument */
635 #define Dblext_subtract(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
636     if( Dextallp4(rightd) > Dextallp4(leftd) )                  \
637         if( (Dextallp3(leftc)--) == 0)                          \
638             if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;  \
639     Dextallp4(resultd) = Dextallp4(leftd) - Dextallp4(rightd);  \
640     if( Dextallp3(rightc) > Dextallp3(leftc) )                  \
641         if( (Dextallp2(leftb)--) == 0) Dextallp1(lefta)--;      \
642     Dextallp3(resultc) = Dextallp3(leftc) - Dextallp3(rightc);  \
643     if( Dextallp2(rightb) > Dextallp2(leftb) ) Dextallp1(lefta)--; \
644     Dextallp2(resultb) = Dextallp2(leftb) - Dextallp2(rightb);  \
645     Dextallp1(resulta) = Dextallp1(lefta) - Dextallp1(righta)
646 
647 #define Dblext_addition(lefta,leftb,leftc,leftd,righta,rightb,rightc,rightd,resulta,resultb,resultc,resultd) \
648     /* If the sum of the low words is less than either source, then \
649      * an overflow into the next word occurred. */ \
650     if ((Dextallp4(resultd) = Dextallp4(leftd)+Dextallp4(rightd)) < \
651         Dextallp4(rightd)) \
652         if((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)+1) <= \
653             Dextallp3(rightc)) \
654             if((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
655                 <= Dextallp2(rightb))  \
656                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
657             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
658         else \
659             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
660                 Dextallp2(rightb)) \
661                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
662             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
663     else \
664         if ((Dextallp3(resultc) = Dextallp3(leftc)+Dextallp3(rightc)) < \
665             Dextallp3(rightc))  \
666             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)+1) \
667                 <= Dextallp2(rightb)) \
668                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
669             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta); \
670         else \
671             if ((Dextallp2(resultb) = Dextallp2(leftb)+Dextallp2(rightb)) < \
672                 Dextallp2(rightb)) \
673                     Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)+1; \
674             else Dextallp1(resulta) = Dextallp1(lefta)+Dextallp1(righta)
675 
676 
677 #define Dblext_arithrightshiftby1(srcdstA,srcdstB,srcdstC,srcdstD)      \
678     Shiftdouble(Dextallp3(srcdstC),Dextallp4(srcdstD),1,Dextallp4(srcdstD)); \
679     Shiftdouble(Dextallp2(srcdstB),Dextallp3(srcdstC),1,Dextallp3(srcdstC)); \
680     Shiftdouble(Dextallp1(srcdstA),Dextallp2(srcdstB),1,Dextallp2(srcdstB)); \
681     Dextallp1(srcdstA) = (int)Dextallp1(srcdstA) >> 1
682    
683 #define Dblext_leftshiftby8(valA,valB,valC,valD) \
684     Shiftdouble(Dextallp1(valA),Dextallp2(valB),24,Dextallp1(valA)); \
685     Shiftdouble(Dextallp2(valB),Dextallp3(valC),24,Dextallp2(valB)); \
686     Shiftdouble(Dextallp3(valC),Dextallp4(valD),24,Dextallp3(valC)); \
687     Dextallp4(valD) <<= 8
688 #define Dblext_leftshiftby4(valA,valB,valC,valD) \
689     Shiftdouble(Dextallp1(valA),Dextallp2(valB),28,Dextallp1(valA)); \
690     Shiftdouble(Dextallp2(valB),Dextallp3(valC),28,Dextallp2(valB)); \
691     Shiftdouble(Dextallp3(valC),Dextallp4(valD),28,Dextallp3(valC)); \
692     Dextallp4(valD) <<= 4
693 #define Dblext_leftshiftby3(valA,valB,valC,valD) \
694     Shiftdouble(Dextallp1(valA),Dextallp2(valB),29,Dextallp1(valA)); \
695     Shiftdouble(Dextallp2(valB),Dextallp3(valC),29,Dextallp2(valB)); \
696     Shiftdouble(Dextallp3(valC),Dextallp4(valD),29,Dextallp3(valC)); \
697     Dextallp4(valD) <<= 3
698 #define Dblext_leftshiftby2(valA,valB,valC,valD) \
699     Shiftdouble(Dextallp1(valA),Dextallp2(valB),30,Dextallp1(valA)); \
700     Shiftdouble(Dextallp2(valB),Dextallp3(valC),30,Dextallp2(valB)); \
701     Shiftdouble(Dextallp3(valC),Dextallp4(valD),30,Dextallp3(valC)); \
702     Dextallp4(valD) <<= 2
703 #define Dblext_leftshiftby1(valA,valB,valC,valD) \
704     Shiftdouble(Dextallp1(valA),Dextallp2(valB),31,Dextallp1(valA)); \
705     Shiftdouble(Dextallp2(valB),Dextallp3(valC),31,Dextallp2(valB)); \
706     Shiftdouble(Dextallp3(valC),Dextallp4(valD),31,Dextallp3(valC)); \
707     Dextallp4(valD) <<= 1
708 
709 #define Dblext_rightshiftby4(valueA,valueB,valueC,valueD) \
710     Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),4,Dextallp4(valueD)); \
711     Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),4,Dextallp3(valueC)); \
712     Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),4,Dextallp2(valueB)); \
713     Dextallp1(valueA) >>= 4
714 #define Dblext_rightshiftby1(valueA,valueB,valueC,valueD) \
715     Shiftdouble(Dextallp3(valueC),Dextallp4(valueD),1,Dextallp4(valueD)); \
716     Shiftdouble(Dextallp2(valueB),Dextallp3(valueC),1,Dextallp3(valueC)); \
717     Shiftdouble(Dextallp1(valueA),Dextallp2(valueB),1,Dextallp2(valueB)); \
718     Dextallp1(valueA) >>= 1
719 
720 #define Dblext_xortointp1(left,right,result) Dbl_xortointp1(left,right,result)
721 
722 #define Dblext_xorfromintp1(left,right,result) \
723         Dbl_xorfromintp1(left,right,result)
724 
725 #define Dblext_copytoint_exponentmantissap1(src,dest) \
726         Dbl_copytoint_exponentmantissap1(src,dest)
727 
728 #define Dblext_ismagnitudeless(leftB,rightB,signlessleft,signlessright) \
729         Dbl_ismagnitudeless(leftB,rightB,signlessleft,signlessright)
730 
731 #define Dbl_copyto_dblext(src1,src2,dest1,dest2,dest3,dest4) \
732         Dextallp1(dest1) = Dallp1(src1); Dextallp2(dest2) = Dallp2(src2); \
733         Dextallp3(dest3) = 0; Dextallp4(dest4) = 0
734 
735 #define Dblext_set_sign(dbl_value,sign)  Dbl_set_sign(dbl_value,sign)  
736 #define Dblext_clear_signexponent_set_hidden(srcdst) \
737         Dbl_clear_signexponent_set_hidden(srcdst) 
738 #define Dblext_clear_signexponent(srcdst) Dbl_clear_signexponent(srcdst) 
739 #define Dblext_clear_sign(srcdst) Dbl_clear_sign(srcdst) 
740 #define Dblext_isone_hidden(dbl_value) Dbl_isone_hidden(dbl_value) 
741 
742 /*
743  * The Fourword_add() macro assumes that integers are 4 bytes in size.
744  * It will break if this is not the case.
745  */
746 
747 #define Fourword_add(src1dstA,src1dstB,src1dstC,src1dstD,src2A,src2B,src2C,src2D) \
748         /*                                                              \
749          * want this macro to generate:                                 \
750          *      ADD     src1dstD,src2D,src1dstD;                        \
751          *      ADDC    src1dstC,src2C,src1dstC;                        \
752          *      ADDC    src1dstB,src2B,src1dstB;                        \
753          *      ADDC    src1dstA,src2A,src1dstA;                        \
754          */                                                             \
755         if ((unsigned int)(src1dstD += (src2D)) < (unsigned int)(src2D)) { \
756            if ((unsigned int)(src1dstC += (src2C) + 1) <=               \
757                (unsigned int)(src2C)) {                                 \
758              if ((unsigned int)(src1dstB += (src2B) + 1) <=             \
759                  (unsigned int)(src2B)) src1dstA++;                     \
760            }                                                            \
761            else if ((unsigned int)(src1dstB += (src2B)) <               \
762                     (unsigned int)(src2B)) src1dstA++;                  \
763         }                                                               \
764         else {                                                          \
765            if ((unsigned int)(src1dstC += (src2C)) <                    \
766                (unsigned int)(src2C)) {                                 \
767               if ((unsigned int)(src1dstB += (src2B) + 1) <=            \
768                   (unsigned int)(src2B)) src1dstA++;                    \
769            }                                                            \
770            else if ((unsigned int)(src1dstB += (src2B)) <               \
771                     (unsigned int)(src2B)) src1dstA++;                  \
772         }                                                               \
773         src1dstA += (src2A)
774 
775 #define Dblext_denormalize(opndp1,opndp2,opndp3,opndp4,exponent,is_tiny) \
776   {int shiftamt, sticky;                                                \
777     is_tiny = TRUE;                                                     \
778     if (exponent == 0 && (Dextallp3(opndp3) || Dextallp4(opndp4))) {    \
779         switch (Rounding_mode()) {                                      \
780         case ROUNDPLUS:                                                 \
781                 if (Dbl_iszero_sign(opndp1)) {                          \
782                         Dbl_increment(opndp1,opndp2);                   \
783                         if (Dbl_isone_hiddenoverflow(opndp1))           \
784                                 is_tiny = FALSE;                        \
785                         Dbl_decrement(opndp1,opndp2);                   \
786                 }                                                       \
787                 break;                                                  \
788         case ROUNDMINUS:                                                \
789                 if (Dbl_isone_sign(opndp1)) {                           \
790                         Dbl_increment(opndp1,opndp2);                   \
791                         if (Dbl_isone_hiddenoverflow(opndp1))           \
792                                 is_tiny = FALSE;                        \
793                         Dbl_decrement(opndp1,opndp2);                   \
794                 }                                                       \
795                 break;                                                  \
796         case ROUNDNEAREST:                                              \
797                 if (Dblext_isone_highp3(opndp3) &&                      \
798                     (Dblext_isone_lowp2(opndp2) ||                      \
799                      Dblext_isnotzero_low31p3(opndp3))) {               \
800                         Dbl_increment(opndp1,opndp2);                   \
801                         if (Dbl_isone_hiddenoverflow(opndp1))           \
802                                 is_tiny = FALSE;                        \
803                         Dbl_decrement(opndp1,opndp2);                   \
804                 }                                                       \
805                 break;                                                  \
806         }                                                               \
807     }                                                                   \
808     Dblext_clear_signexponent_set_hidden(opndp1);                       \
809     if (exponent >= (1-QUAD_P)) {                                       \
810         shiftamt = (1-exponent) % 32;                                   \
811         switch((1-exponent)/32) {                                       \
812           case 0: sticky = Dextallp4(opndp4) << 32-(shiftamt);          \
813                   Variableshiftdouble(opndp3,opndp4,shiftamt,opndp4);   \
814                   Variableshiftdouble(opndp2,opndp3,shiftamt,opndp3);   \
815                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp2);   \
816                   Dextallp1(opndp1) >>= shiftamt;                       \
817                   break;                                                \
818           case 1: sticky = (Dextallp3(opndp3) << 32-(shiftamt)) |       \
819                            Dextallp4(opndp4);                           \
820                   Variableshiftdouble(opndp2,opndp3,shiftamt,opndp4);   \
821                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp3);   \
822                   Dextallp2(opndp2) = Dextallp1(opndp1) >> shiftamt;    \
823                   Dextallp1(opndp1) = 0;                                \
824                   break;                                                \
825           case 2: sticky = (Dextallp2(opndp2) << 32-(shiftamt)) |       \
826                             Dextallp3(opndp3) | Dextallp4(opndp4);      \
827                   Variableshiftdouble(opndp1,opndp2,shiftamt,opndp4);   \
828                   Dextallp3(opndp3) = Dextallp1(opndp1) >> shiftamt;    \
829                   Dextallp1(opndp1) = Dextallp2(opndp2) = 0;            \
830                   break;                                                \
831           case 3: sticky = (Dextallp1(opndp1) << 32-(shiftamt)) |       \
832                         Dextallp2(opndp2) | Dextallp3(opndp3) |         \
833                         Dextallp4(opndp4);                              \
834                   Dextallp4(opndp4) = Dextallp1(opndp1) >> shiftamt;    \
835                   Dextallp1(opndp1) = Dextallp2(opndp2) = 0;            \
836                   Dextallp3(opndp3) = 0;                                \
837                   break;                                                \
838         }                                                               \
839     }                                                                   \
840     else {                                                              \
841         sticky = Dextallp1(opndp1) | Dextallp2(opndp2) |                \
842                  Dextallp3(opndp3) | Dextallp4(opndp4);                 \
843         Dblext_setzero(opndp1,opndp2,opndp3,opndp4);                    \
844     }                                                                   \
845     if (sticky) Dblext_setone_lowmantissap4(opndp4);                    \
846     exponent = 0;                                                       \
847   }
848 

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