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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
22#ifdef __NO_PA_HDRS
23 PA header file -- do not include this header file for non-PA builds.
24#endif
25
26/* 32-bit word grabing functions */
27#define Sgl_firstword(value) Sall(value)
28#define Sgl_secondword(value) dummy_location
29#define Sgl_thirdword(value) dummy_location
30#define Sgl_fourthword(value) dummy_location
31
32#define Sgl_sign(object) Ssign(object)
33#define Sgl_exponent(object) Sexponent(object)
34#define Sgl_signexponent(object) Ssignexponent(object)
35#define Sgl_mantissa(object) Smantissa(object)
36#define Sgl_exponentmantissa(object) Sexponentmantissa(object)
37#define Sgl_all(object) Sall(object)
38
39/* sgl_and_signs ands the sign bits of each argument and puts the result
40 * into the first argument. sgl_or_signs ors those same sign bits */
41#define Sgl_and_signs( src1dst, src2) \
42 Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst)
43#define Sgl_or_signs( src1dst, src2) \
44 Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst)
45
46/* The hidden bit is always the low bit of the exponent */
47#define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
48#define Sgl_clear_signexponent_set_hidden(srcdst) \
49 Deposit_ssignexponent(srcdst,1)
50#define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31)
51#define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff
52
53/* varamount must be less than 32 for the next three functions */
54#define Sgl_rightshift(srcdst, varamount) \
55 Sall(srcdst) >>= varamount
56#define Sgl_leftshift(srcdst, varamount) \
57 Sall(srcdst) <<= varamount
58#define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
59 Sall(srcdst) = \
60 (Sexponentmantissa(srcdst) >> varamount) | \
61 (Sall(srcdst) & ((unsigned int)1<<31))
62
63#define Sgl_leftshiftby1_withextent(left,right,result) \
64 Shiftdouble(Sall(left),Extall(right),31,Sall(result))
65
66#define Sgl_rightshiftby1_withextent(left,right,dst) \
67 Shiftdouble(Sall(left),Extall(right),1,Extall(right))
68#define Sgl_arithrightshiftby1(srcdst) \
69 Sall(srcdst) = (int)Sall(srcdst) >> 1
70
71/* Sign extend the sign bit with an integer destination */
72#define Sgl_signextendedsign(value) Ssignedsign(value)
73
74#define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
75#define Sgl_increment(sgl_value) Sall(sgl_value) += 1
76#define Sgl_increment_mantissa(sgl_value) \
77 Deposit_smantissa(sgl_value,sgl_value+1)
78#define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1
79
80#define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
81#define Sgl_isone_hiddenoverflow(sgl_value) \
82 (Is_shiddenoverflow(sgl_value)!=0)
83#define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
84#define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
85#define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
86#define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
87#define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
88 (Shiddenhigh7mantissa(sgl_value)!=0)
89#define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
90#define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
91#define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
92#define Sgl_isnotzero_exponentmantissa(sgl_value) \
93 (Sexponentmantissa(sgl_value)!=0)
94#define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
95#define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
96#define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
97#define Sgl_iszero_hiddenoverflow(sgl_value) \
98 (Is_shiddenoverflow(sgl_value)==0)
99#define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
100 (Shiddenhigh3mantissa(sgl_value)==0)
101#define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
102 (Shiddenhigh7mantissa(sgl_value)==0)
103#define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
104#define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
105#define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
106#define Sgl_iszero_exponentmantissa(sgl_value) \
107 (Sexponentmantissa(sgl_value)==0)
108#define Sgl_isinfinity_exponent(sgl_value) \
109 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
110#define Sgl_isnotinfinity_exponent(sgl_value) \
111 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
112#define Sgl_isinfinity(sgl_value) \
113 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
114 Sgl_mantissa(sgl_value)==0)
115#define Sgl_isnan(sgl_value) \
116 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
117 Sgl_mantissa(sgl_value)!=0)
118#define Sgl_isnotnan(sgl_value) \
119 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT || \
120 Sgl_mantissa(sgl_value)==0)
121#define Sgl_islessthan(sgl_op1,sgl_op2) \
122 (Sall(sgl_op1) < Sall(sgl_op2))
123#define Sgl_isgreaterthan(sgl_op1,sgl_op2) \
124 (Sall(sgl_op1) > Sall(sgl_op2))
125#define Sgl_isnotlessthan(sgl_op1,sgl_op2) \
126 (Sall(sgl_op1) >= Sall(sgl_op2))
127#define Sgl_isequal(sgl_op1,sgl_op2) \
128 (Sall(sgl_op1) == Sall(sgl_op2))
129
130#define Sgl_leftshiftby8(sgl_value) \
131 Sall(sgl_value) <<= 8
132#define Sgl_leftshiftby4(sgl_value) \
133 Sall(sgl_value) <<= 4
134#define Sgl_leftshiftby3(sgl_value) \
135 Sall(sgl_value) <<= 3
136#define Sgl_leftshiftby2(sgl_value) \
137 Sall(sgl_value) <<= 2
138#define Sgl_leftshiftby1(sgl_value) \
139 Sall(sgl_value) <<= 1
140#define Sgl_rightshiftby1(sgl_value) \
141 Sall(sgl_value) >>= 1
142#define Sgl_rightshiftby4(sgl_value) \
143 Sall(sgl_value) >>= 4
144#define Sgl_rightshiftby8(sgl_value) \
145 Sall(sgl_value) >>= 8
146
147#define Sgl_ismagnitudeless(signlessleft,signlessright) \
148/* unsigned int signlessleft, signlessright; */ \
149 (signlessleft < signlessright)
150
151
152#define Sgl_copytoint_exponentmantissa(source,dest) \
153 dest = Sexponentmantissa(source)
154
155/* A quiet NaN has the high mantissa bit clear and at least on other (in this
156 * case the adjacent bit) bit set. */
157#define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
158#define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)
159
160#define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
161#define Sgl_set_exponentmantissa(dest,value) \
162 Deposit_sexponentmantissa(dest,value)
163
164/* An infinity is represented with the max exponent and a zero mantissa */
165#define Sgl_setinfinity_exponent(sgl_value) \
166 Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
167#define Sgl_setinfinity_exponentmantissa(sgl_value) \
168 Deposit_sexponentmantissa(sgl_value, \
169 (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
170#define Sgl_setinfinitypositive(sgl_value) \
171 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
172#define Sgl_setinfinitynegative(sgl_value) \
173 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
174 | ((unsigned int)1<<31)
175#define Sgl_setinfinity(sgl_value,sign) \
176 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
177 ((unsigned int)sign << 31)
178#define Sgl_sethigh4bits(sgl_value, extsign) \
179 Deposit_shigh4(sgl_value,extsign)
180#define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
181#define Sgl_invert_sign(sgl_value) \
182 Deposit_ssign(sgl_value,~Ssign(sgl_value))
183#define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
184#define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
185#define Sgl_setzero_sign(sgl_value) Sall(sgl_value) &= 0x7fffffff
186#define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
187#define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
188#define Sgl_setzero_exponentmantissa(sgl_value) Sall(sgl_value) &= 0x80000000
189#define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
190#define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31
191
192/* Use following macro for both overflow & underflow conditions */
193#define ovfl -
194#define unfl +
195#define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
196 Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))
197
198#define Sgl_setlargestpositive(sgl_value) \
199 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
200 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )
201#define Sgl_setlargestnegative(sgl_value) \
202 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
203 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) \
204 | ((unsigned int)1<<31)
205
206#define Sgl_setnegativeinfinity(sgl_value) \
207 Sall(sgl_value) = \
208 ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
209#define Sgl_setlargest(sgl_value,sign) \
210 Sall(sgl_value) = (unsigned int)sign << 31 | \
211 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
212 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
213#define Sgl_setlargest_exponentmantissa(sgl_value) \
214 Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) | \
215 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
216 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
217
218/* The high bit is always zero so arithmetic or logical shifts will work. */
219#define Sgl_right_align(srcdst,shift,extent) \
220 /* sgl_floating_point srcdst; int shift; extension extent */ \
221 if (shift < 32) { \
222 Extall(extent) = Sall(srcdst) << (32-(shift)); \
223 Sall(srcdst) >>= shift; \
224 } \
225 else { \
226 Extall(extent) = Sall(srcdst); \
227 Sall(srcdst) = 0; \
228 }
229#define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
230#define Sgl_hidden(sgl_value) Shidden(sgl_value)
231#define Sgl_lowmantissa(sgl_value) Slow(sgl_value)
232
233/* The left argument is never smaller than the right argument */
234#define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
235 Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)
236
237/* Subtract right augmented with extension from left augmented with zeros and
238 * store into result and extension. */
239#define Sgl_subtract_withextension(left,right,extent,result) \
240 /* sgl_floating_point left,right,result; extension extent */ \
241 Sgl_subtract(left,right,result); \
242 if((Extall(extent) = 0-Extall(extent))) \
243 Sall(result) = Sall(result)-1
244
245#define Sgl_addition(sgl_left,sgl_right,sgl_result) \
246 Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)
247
248#define Sgl_xortointp1(left,right,result) \
249 result = Sall(left) XOR Sall(right);
250
251#define Sgl_xorfromintp1(left,right,result) \
252 Sall(result) = left XOR Sall(right)
253
254/* Need to Initialize */
255#define Sgl_makequietnan(dest) \
256 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
257 | (1<<(32-(1+SGL_EXP_LENGTH+2)))
258#define Sgl_makesignalingnan(dest) \
259 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
260 | (1<<(32-(1+SGL_EXP_LENGTH+1)))
261
262#define Sgl_normalize(sgl_opnd,exponent) \
263 while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) { \
264 Sgl_leftshiftby8(sgl_opnd); \
265 exponent -= 8; \
266 } \
267 if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) { \
268 Sgl_leftshiftby4(sgl_opnd); \
269 exponent -= 4; \
270 } \
271 while(Sgl_iszero_hidden(sgl_opnd)) { \
272 Sgl_leftshiftby1(sgl_opnd); \
273 exponent -= 1; \
274 }
275
276#define Sgl_setoverflow(sgl_opnd) \
277 /* set result to infinity or largest number */ \
278 switch (Rounding_mode()) { \
279 case ROUNDPLUS: \
280 if (Sgl_isone_sign(sgl_opnd)) { \
281 Sgl_setlargestnegative(sgl_opnd); \
282 } \
283 else { \
284 Sgl_setinfinitypositive(sgl_opnd); \
285 } \
286 break; \
287 case ROUNDMINUS: \
288 if (Sgl_iszero_sign(sgl_opnd)) { \
289 Sgl_setlargestpositive(sgl_opnd); \
290 } \
291 else { \
292 Sgl_setinfinitynegative(sgl_opnd); \
293 } \
294 break; \
295 case ROUNDNEAREST: \
296 Sgl_setinfinity_exponentmantissa(sgl_opnd); \
297 break; \
298 case ROUNDZERO: \
299 Sgl_setlargest_exponentmantissa(sgl_opnd); \
300 }
301
302#define Sgl_denormalize(opnd,exponent,guard,sticky,inexact) \
303 Sgl_clear_signexponent_set_hidden(opnd); \
304 if (exponent >= (1 - SGL_P)) { \
305 guard = (Sall(opnd) >> -exponent) & 1; \
306 if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
307 inexact = guard | sticky; \
308 Sall(opnd) >>= (1-exponent); \
309 } \
310 else { \
311 guard = 0; \
312 sticky |= Sall(opnd); \
313 inexact = sticky; \
314 Sgl_setzero(opnd); \
315 }
316
317/*
318 * The fused multiply add instructions requires a single extended format,
319 * with 48 bits of mantissa.
320 */
321#define SGLEXT_THRESHOLD 48
322
323#define Sglext_setzero(valA,valB) \
324 Sextallp1(valA) = 0; Sextallp2(valB) = 0
325
326#define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)
327#define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0)
328#define Sglext_isone_highp2(val) (Sexthighp2(val)!=0)
329#define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0)
330#define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)
331
332#define Sgl_copytoptr(src,destptr) *destptr = src
333#define Sgl_copyfromptr(srcptr,dest) dest = *srcptr
334#define Sglext_copy(srca,srcb,desta,destb) \
335 Sextallp1(desta) = Sextallp1(srca); \
336 Sextallp2(destb) = Sextallp2(srcb)
337#define Sgl_copyto_sglext(src1,dest1,dest2) \
338 Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0
339
340#define Sglext_swap_lower(leftp2,rightp2) \
341 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
342 Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
343 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2)
344
345#define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1)
346
347/* The high bit is always zero so arithmetic or logical shifts will work. */
348#define Sglext_right_align(srcdstA,srcdstB,shift) \
349 {int shiftamt, sticky; \
350 shiftamt = shift % 32; \
351 sticky = 0; \
352 switch (shift/32) { \
353 case 0: if (shiftamt > 0) { \
354 sticky = Sextallp2(srcdstB) << 32 - (shiftamt); \
355 Variable_shift_double(Sextallp1(srcdstA), \
356 Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB)); \
357 Sextallp1(srcdstA) >>= shiftamt; \
358 } \
359 break; \
360 case 1: if (shiftamt > 0) { \
361 sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) | \
362 Sextallp2(srcdstB); \
363 } \
364 else { \
365 sticky = Sextallp2(srcdstB); \
366 } \
367 Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt; \
368 Sextallp1(srcdstA) = 0; \
369 break; \
370 } \
371 if (sticky) Sglext_setone_lowmantissap2(srcdstB); \
372 }
373
374/* The left argument is never smaller than the right argument */
375#define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \
376 if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \
377 Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb); \
378 Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta)
379
380#define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \
381 /* If the sum of the low words is less than either source, then \
382 * an overflow into the next word occurred. */ \
383 if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \
384 Sextallp2(rightb)) \
385 Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \
386 else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)
387
388
389#define Sglext_arithrightshiftby1(srcdstA,srcdstB) \
390 Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \
391 Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1
392
393#define Sglext_leftshiftby8(valA,valB) \
394 Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
395 Sextallp2(valB) <<= 8
396#define Sglext_leftshiftby4(valA,valB) \
397 Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
398 Sextallp2(valB) <<= 4
399#define Sglext_leftshiftby3(valA,valB) \
400 Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
401 Sextallp2(valB) <<= 3
402#define Sglext_leftshiftby2(valA,valB) \
403 Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
404 Sextallp2(valB) <<= 2
405#define Sglext_leftshiftby1(valA,valB) \
406 Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
407 Sextallp2(valB) <<= 1
408
409#define Sglext_rightshiftby4(valueA,valueB) \
410 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \
411 Sextallp1(valueA) >>= 4
412#define Sglext_rightshiftby3(valueA,valueB) \
413 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \
414 Sextallp1(valueA) >>= 3
415#define Sglext_rightshiftby1(valueA,valueB) \
416 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \
417 Sextallp1(valueA) >>= 1
418
419#define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result)
420#define Sglext_xorfromintp1(left,right,result) \
421 Sgl_xorfromintp1(left,right,result)
422#define Sglext_copytoint_exponentmantissa(src,dest) \
423 Sgl_copytoint_exponentmantissa(src,dest)
424#define Sglext_ismagnitudeless(signlessleft,signlessright) \
425 Sgl_ismagnitudeless(signlessleft,signlessright)
426
427#define Sglext_set_sign(dbl_value,sign) Sgl_set_sign(dbl_value,sign)
428#define Sglext_clear_signexponent_set_hidden(srcdst) \
429 Sgl_clear_signexponent_set_hidden(srcdst)
430#define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst)
431#define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst)
432#define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value)
433
434#define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny) \
435 {int sticky; \
436 is_tiny = TRUE; \
437 if (exponent == 0 && Sextallp2(opndp2)) { \
438 switch (Rounding_mode()) { \
439 case ROUNDPLUS: \
440 if (Sgl_iszero_sign(opndp1)) \
441 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
442 is_tiny = FALSE; \
443 break; \
444 case ROUNDMINUS: \
445 if (Sgl_isone_sign(opndp1)) { \
446 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
447 is_tiny = FALSE; \
448 } \
449 break; \
450 case ROUNDNEAREST: \
451 if (Sglext_isone_highp2(opndp2) && \
452 (Sglext_isone_lowp1(opndp1) || \
453 Sglext_isnotzero_low31p2(opndp2))) \
454 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
455 is_tiny = FALSE; \
456 break; \
457 } \
458 } \
459 Sglext_clear_signexponent_set_hidden(opndp1); \
460 if (exponent >= (1-DBL_P)) { \
461 if (exponent >= -31) { \
462 if (exponent > -31) { \
463 sticky = Sextallp2(opndp2) << 31+exponent; \
464 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
465 Sextallp1(opndp1) >>= 1-exponent; \
466 } \
467 else { \
468 sticky = Sextallp2(opndp2); \
469 Sextallp2(opndp2) = Sextallp1(opndp1); \
470 Sextallp1(opndp1) = 0; \
471 } \
472 } \
473 else { \
474 sticky = (Sextallp1(opndp1) << 31+exponent) | \
475 Sextallp2(opndp2); \
476 Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent; \
477 Sextallp1(opndp1) = 0; \
478 } \
479 } \
480 else { \
481 sticky = Sextallp1(opndp1) | Sextallp2(opndp2); \
482 Sglext_setzero(opndp1,opndp2); \
483 } \
484 if (sticky) Sglext_setone_lowmantissap2(opndp2); \
485 exponent = 0; \
486 }
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