1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
4 *
5 * Floating-point emulation code
6 * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
7 */
8
9 #ifdef __NO_PA_HDRS
10 PA header file -- do not include this header file for non-PA builds.
11 #endif
12
13 /* 32-bit word grabbing functions */
14 #define Sgl_firstword(value) Sall(value)
15 #define Sgl_secondword(value) dummy_location
16 #define Sgl_thirdword(value) dummy_location
17 #define Sgl_fourthword(value) dummy_location
18
19 #define Sgl_sign(object) Ssign(object)
20 #define Sgl_exponent(object) Sexponent(object)
21 #define Sgl_signexponent(object) Ssignexponent(object)
22 #define Sgl_mantissa(object) Smantissa(object)
23 #define Sgl_exponentmantissa(object) Sexponentmantissa(object)
24 #define Sgl_all(object) Sall(object)
25
26 /* sgl_and_signs ANDs the sign bits of each argument and puts the result
27 * into the first argument. sgl_or_signs ors those same sign bits */
28 #define Sgl_and_signs( src1dst, src2) \
29 Sall(src1dst) = (Sall(src2)|~((unsigned int)1<<31)) & Sall(src1dst)
30 #define Sgl_or_signs( src1dst, src2) \
31 Sall(src1dst) = (Sall(src2)&((unsigned int)1<<31)) | Sall(src1dst)
32
33 /* The hidden bit is always the low bit of the exponent */
34 #define Sgl_clear_exponent_set_hidden(srcdst) Deposit_sexponent(srcdst,1)
35 #define Sgl_clear_signexponent_set_hidden(srcdst) \
36 Deposit_ssignexponent(srcdst,1)
37 #define Sgl_clear_sign(srcdst) Sall(srcdst) &= ~((unsigned int)1<<31)
38 #define Sgl_clear_signexponent(srcdst) Sall(srcdst) &= 0x007fffff
39
40 /* varamount must be less than 32 for the next three functions */
41 #define Sgl_rightshift(srcdst, varamount) \
42 Sall(srcdst) >>= varamount
43 #define Sgl_leftshift(srcdst, varamount) \
44 Sall(srcdst) <<= varamount
45 #define Sgl_rightshift_exponentmantissa(srcdst, varamount) \
46 Sall(srcdst) = \
47 (Sexponentmantissa(srcdst) >> varamount) | \
48 (Sall(srcdst) & ((unsigned int)1<<31))
49
50 #define Sgl_leftshiftby1_withextent(left,right,result) \
51 Shiftdouble(Sall(left),Extall(right),31,Sall(result))
52
53 #define Sgl_rightshiftby1_withextent(left,right,dst) \
54 Shiftdouble(Sall(left),Extall(right),1,Extall(right))
55 #define Sgl_arithrightshiftby1(srcdst) \
56 Sall(srcdst) = (int)Sall(srcdst) >> 1
57
58 /* Sign extend the sign bit with an integer destination */
59 #define Sgl_signextendedsign(value) Ssignedsign(value)
60
61 #define Sgl_isone_hidden(sgl_value) (Shidden(sgl_value))
62 #define Sgl_increment(sgl_value) Sall(sgl_value) += 1
63 #define Sgl_increment_mantissa(sgl_value) \
64 Deposit_smantissa(sgl_value,sgl_value+1)
65 #define Sgl_decrement(sgl_value) Sall(sgl_value) -= 1
66
67 #define Sgl_isone_sign(sgl_value) (Is_ssign(sgl_value)!=0)
68 #define Sgl_isone_hiddenoverflow(sgl_value) \
69 (Is_shiddenoverflow(sgl_value)!=0)
70 #define Sgl_isone_lowmantissa(sgl_value) (Is_slow(sgl_value)!=0)
71 #define Sgl_isone_signaling(sgl_value) (Is_ssignaling(sgl_value)!=0)
72 #define Sgl_is_signalingnan(sgl_value) (Ssignalingnan(sgl_value)==0x1ff)
73 #define Sgl_isnotzero(sgl_value) (Sall(sgl_value)!=0)
74 #define Sgl_isnotzero_hiddenhigh7mantissa(sgl_value) \
75 (Shiddenhigh7mantissa(sgl_value)!=0)
76 #define Sgl_isnotzero_low4(sgl_value) (Slow4(sgl_value)!=0)
77 #define Sgl_isnotzero_exponent(sgl_value) (Sexponent(sgl_value)!=0)
78 #define Sgl_isnotzero_mantissa(sgl_value) (Smantissa(sgl_value)!=0)
79 #define Sgl_isnotzero_exponentmantissa(sgl_value) \
80 (Sexponentmantissa(sgl_value)!=0)
81 #define Sgl_iszero(sgl_value) (Sall(sgl_value)==0)
82 #define Sgl_iszero_signaling(sgl_value) (Is_ssignaling(sgl_value)==0)
83 #define Sgl_iszero_hidden(sgl_value) (Is_shidden(sgl_value)==0)
84 #define Sgl_iszero_hiddenoverflow(sgl_value) \
85 (Is_shiddenoverflow(sgl_value)==0)
86 #define Sgl_iszero_hiddenhigh3mantissa(sgl_value) \
87 (Shiddenhigh3mantissa(sgl_value)==0)
88 #define Sgl_iszero_hiddenhigh7mantissa(sgl_value) \
89 (Shiddenhigh7mantissa(sgl_value)==0)
90 #define Sgl_iszero_sign(sgl_value) (Is_ssign(sgl_value)==0)
91 #define Sgl_iszero_exponent(sgl_value) (Sexponent(sgl_value)==0)
92 #define Sgl_iszero_mantissa(sgl_value) (Smantissa(sgl_value)==0)
93 #define Sgl_iszero_exponentmantissa(sgl_value) \
94 (Sexponentmantissa(sgl_value)==0)
95 #define Sgl_isinfinity_exponent(sgl_value) \
96 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT)
97 #define Sgl_isnotinfinity_exponent(sgl_value) \
98 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT)
99 #define Sgl_isinfinity(sgl_value) \
100 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
101 Sgl_mantissa(sgl_value)==0)
102 #define Sgl_isnan(sgl_value) \
103 (Sgl_exponent(sgl_value)==SGL_INFINITY_EXPONENT && \
104 Sgl_mantissa(sgl_value)!=0)
105 #define Sgl_isnotnan(sgl_value) \
106 (Sgl_exponent(sgl_value)!=SGL_INFINITY_EXPONENT || \
107 Sgl_mantissa(sgl_value)==0)
108 #define Sgl_islessthan(sgl_op1,sgl_op2) \
109 (Sall(sgl_op1) < Sall(sgl_op2))
110 #define Sgl_isgreaterthan(sgl_op1,sgl_op2) \
111 (Sall(sgl_op1) > Sall(sgl_op2))
112 #define Sgl_isnotlessthan(sgl_op1,sgl_op2) \
113 (Sall(sgl_op1) >= Sall(sgl_op2))
114 #define Sgl_isequal(sgl_op1,sgl_op2) \
115 (Sall(sgl_op1) == Sall(sgl_op2))
116
117 #define Sgl_leftshiftby8(sgl_value) \
118 Sall(sgl_value) <<= 8
119 #define Sgl_leftshiftby4(sgl_value) \
120 Sall(sgl_value) <<= 4
121 #define Sgl_leftshiftby3(sgl_value) \
122 Sall(sgl_value) <<= 3
123 #define Sgl_leftshiftby2(sgl_value) \
124 Sall(sgl_value) <<= 2
125 #define Sgl_leftshiftby1(sgl_value) \
126 Sall(sgl_value) <<= 1
127 #define Sgl_rightshiftby1(sgl_value) \
128 Sall(sgl_value) >>= 1
129 #define Sgl_rightshiftby4(sgl_value) \
130 Sall(sgl_value) >>= 4
131 #define Sgl_rightshiftby8(sgl_value) \
132 Sall(sgl_value) >>= 8
133
134 #define Sgl_ismagnitudeless(signlessleft,signlessright) \
135 /* unsigned int signlessleft, signlessright; */ \
136 (signlessleft < signlessright)
137
138
139 #define Sgl_copytoint_exponentmantissa(source,dest) \
140 dest = Sexponentmantissa(source)
141
142 /* A quiet NaN has the high mantissa bit clear and at least on other (in this
143 * case the adjacent bit) bit set. */
144 #define Sgl_set_quiet(sgl_value) Deposit_shigh2mantissa(sgl_value,1)
145 #define Sgl_set_exponent(sgl_value,exp) Deposit_sexponent(sgl_value,exp)
146
147 #define Sgl_set_mantissa(dest,value) Deposit_smantissa(dest,value)
148 #define Sgl_set_exponentmantissa(dest,value) \
149 Deposit_sexponentmantissa(dest,value)
150
151 /* An infinity is represented with the max exponent and a zero mantissa */
152 #define Sgl_setinfinity_exponent(sgl_value) \
153 Deposit_sexponent(sgl_value,SGL_INFINITY_EXPONENT)
154 #define Sgl_setinfinity_exponentmantissa(sgl_value) \
155 Deposit_sexponentmantissa(sgl_value, \
156 (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))))
157 #define Sgl_setinfinitypositive(sgl_value) \
158 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH)))
159 #define Sgl_setinfinitynegative(sgl_value) \
160 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) \
161 | ((unsigned int)1<<31)
162 #define Sgl_setinfinity(sgl_value,sign) \
163 Sall(sgl_value) = (SGL_INFINITY_EXPONENT << (32-(1+SGL_EXP_LENGTH))) | \
164 ((unsigned int)sign << 31)
165 #define Sgl_sethigh4bits(sgl_value, extsign) \
166 Deposit_shigh4(sgl_value,extsign)
167 #define Sgl_set_sign(sgl_value,sign) Deposit_ssign(sgl_value,sign)
168 #define Sgl_invert_sign(sgl_value) \
169 Deposit_ssign(sgl_value,~Ssign(sgl_value))
170 #define Sgl_setone_sign(sgl_value) Deposit_ssign(sgl_value,1)
171 #define Sgl_setone_lowmantissa(sgl_value) Deposit_slow(sgl_value,1)
172 #define Sgl_setzero_sign(sgl_value) Sall(sgl_value) &= 0x7fffffff
173 #define Sgl_setzero_exponent(sgl_value) Sall(sgl_value) &= 0x807fffff
174 #define Sgl_setzero_mantissa(sgl_value) Sall(sgl_value) &= 0xff800000
175 #define Sgl_setzero_exponentmantissa(sgl_value) Sall(sgl_value) &= 0x80000000
176 #define Sgl_setzero(sgl_value) Sall(sgl_value) = 0
177 #define Sgl_setnegativezero(sgl_value) Sall(sgl_value) = (unsigned int)1 << 31
178
179 /* Use following macro for both overflow & underflow conditions */
180 #define ovfl -
181 #define unfl +
182 #define Sgl_setwrapped_exponent(sgl_value,exponent,op) \
183 Deposit_sexponent(sgl_value,(exponent op SGL_WRAP))
184
185 #define Sgl_setlargestpositive(sgl_value) \
186 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
187 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 )
188 #define Sgl_setlargestnegative(sgl_value) \
189 Sall(sgl_value) = ((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
190 | ((1<<(32-(1+SGL_EXP_LENGTH))) - 1 ) \
191 | ((unsigned int)1<<31)
192
193 #define Sgl_setnegativeinfinity(sgl_value) \
194 Sall(sgl_value) = \
195 ((1<<SGL_EXP_LENGTH) | SGL_INFINITY_EXPONENT) << (32-(1+SGL_EXP_LENGTH))
196 #define Sgl_setlargest(sgl_value,sign) \
197 Sall(sgl_value) = (unsigned int)sign << 31 | \
198 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
199 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
200 #define Sgl_setlargest_exponentmantissa(sgl_value) \
201 Sall(sgl_value) = Sall(sgl_value) & ((unsigned int)1<<31) | \
202 (((SGL_EMAX+SGL_BIAS) << (32-(1+SGL_EXP_LENGTH))) \
203 | ((1 << (32-(1+SGL_EXP_LENGTH))) - 1 ))
204
205 /* The high bit is always zero so arithmetic or logical shifts will work. */
206 #define Sgl_right_align(srcdst,shift,extent) \
207 /* sgl_floating_point srcdst; int shift; extension extent */ \
208 if (shift < 32) { \
209 Extall(extent) = Sall(srcdst) << (32-(shift)); \
210 Sall(srcdst) >>= shift; \
211 } \
212 else { \
213 Extall(extent) = Sall(srcdst); \
214 Sall(srcdst) = 0; \
215 }
216 #define Sgl_hiddenhigh3mantissa(sgl_value) Shiddenhigh3mantissa(sgl_value)
217 #define Sgl_hidden(sgl_value) Shidden(sgl_value)
218 #define Sgl_lowmantissa(sgl_value) Slow(sgl_value)
219
220 /* The left argument is never smaller than the right argument */
221 #define Sgl_subtract(sgl_left,sgl_right,sgl_result) \
222 Sall(sgl_result) = Sall(sgl_left) - Sall(sgl_right)
223
224 /* Subtract right augmented with extension from left augmented with zeros and
225 * store into result and extension. */
226 #define Sgl_subtract_withextension(left,right,extent,result) \
227 /* sgl_floating_point left,right,result; extension extent */ \
228 Sgl_subtract(left,right,result); \
229 if((Extall(extent) = 0-Extall(extent))) \
230 Sall(result) = Sall(result)-1
231
232 #define Sgl_addition(sgl_left,sgl_right,sgl_result) \
233 Sall(sgl_result) = Sall(sgl_left) + Sall(sgl_right)
234
235 #define Sgl_xortointp1(left,right,result) \
236 result = Sall(left) XOR Sall(right);
237
238 #define Sgl_xorfromintp1(left,right,result) \
239 Sall(result) = left XOR Sall(right)
240
241 /* Need to Initialize */
242 #define Sgl_makequietnan(dest) \
243 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
244 | (1<<(32-(1+SGL_EXP_LENGTH+2)))
245 #define Sgl_makesignalingnan(dest) \
246 Sall(dest) = ((SGL_EMAX+SGL_BIAS)+1)<< (32-(1+SGL_EXP_LENGTH)) \
247 | (1<<(32-(1+SGL_EXP_LENGTH+1)))
248
249 #define Sgl_normalize(sgl_opnd,exponent) \
250 while(Sgl_iszero_hiddenhigh7mantissa(sgl_opnd)) { \
251 Sgl_leftshiftby8(sgl_opnd); \
252 exponent -= 8; \
253 } \
254 if(Sgl_iszero_hiddenhigh3mantissa(sgl_opnd)) { \
255 Sgl_leftshiftby4(sgl_opnd); \
256 exponent -= 4; \
257 } \
258 while(Sgl_iszero_hidden(sgl_opnd)) { \
259 Sgl_leftshiftby1(sgl_opnd); \
260 exponent -= 1; \
261 }
262
263 #define Sgl_setoverflow(sgl_opnd) \
264 /* set result to infinity or largest number */ \
265 switch (Rounding_mode()) { \
266 case ROUNDPLUS: \
267 if (Sgl_isone_sign(sgl_opnd)) { \
268 Sgl_setlargestnegative(sgl_opnd); \
269 } \
270 else { \
271 Sgl_setinfinitypositive(sgl_opnd); \
272 } \
273 break; \
274 case ROUNDMINUS: \
275 if (Sgl_iszero_sign(sgl_opnd)) { \
276 Sgl_setlargestpositive(sgl_opnd); \
277 } \
278 else { \
279 Sgl_setinfinitynegative(sgl_opnd); \
280 } \
281 break; \
282 case ROUNDNEAREST: \
283 Sgl_setinfinity_exponentmantissa(sgl_opnd); \
284 break; \
285 case ROUNDZERO: \
286 Sgl_setlargest_exponentmantissa(sgl_opnd); \
287 }
288
289 #define Sgl_denormalize(opnd,exponent,guard,sticky,inexact) \
290 Sgl_clear_signexponent_set_hidden(opnd); \
291 if (exponent >= (1 - SGL_P)) { \
292 guard = (Sall(opnd) >> -exponent) & 1; \
293 if (exponent < 0) sticky |= Sall(opnd) << (32+exponent); \
294 inexact = guard | sticky; \
295 Sall(opnd) >>= (1-exponent); \
296 } \
297 else { \
298 guard = 0; \
299 sticky |= Sall(opnd); \
300 inexact = sticky; \
301 Sgl_setzero(opnd); \
302 }
303
304 /*
305 * The fused multiply add instructions requires a single extended format,
306 * with 48 bits of mantissa.
307 */
308 #define SGLEXT_THRESHOLD 48
309
310 #define Sglext_setzero(valA,valB) \
311 Sextallp1(valA) = 0; Sextallp2(valB) = 0
312
313 #define Sglext_isnotzero_mantissap2(valB) (Sextallp2(valB)!=0)
314 #define Sglext_isone_lowp1(val) (Sextlowp1(val)!=0)
315 #define Sglext_isone_highp2(val) (Sexthighp2(val)!=0)
316 #define Sglext_isnotzero_low31p2(val) (Sextlow31p2(val)!=0)
317 #define Sglext_iszero(valA,valB) (Sextallp1(valA)==0 && Sextallp2(valB)==0)
318
319 #define Sgl_copytoptr(src,destptr) *destptr = src
320 #define Sgl_copyfromptr(srcptr,dest) dest = *srcptr
321 #define Sglext_copy(srca,srcb,desta,destb) \
322 Sextallp1(desta) = Sextallp1(srca); \
323 Sextallp2(destb) = Sextallp2(srcb)
324 #define Sgl_copyto_sglext(src1,dest1,dest2) \
325 Sextallp1(dest1) = Sall(src1); Sextallp2(dest2) = 0
326
327 #define Sglext_swap_lower(leftp2,rightp2) \
328 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
329 Sextallp2(rightp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2); \
330 Sextallp2(leftp2) = Sextallp2(leftp2) XOR Sextallp2(rightp2)
331
332 #define Sglext_setone_lowmantissap2(value) Deposit_dlowp2(value,1)
333
334 /* The high bit is always zero so arithmetic or logical shifts will work. */
335 #define Sglext_right_align(srcdstA,srcdstB,shift) \
336 {int shiftamt, sticky; \
337 shiftamt = shift % 32; \
338 sticky = 0; \
339 switch (shift/32) { \
340 case 0: if (shiftamt > 0) { \
341 sticky = Sextallp2(srcdstB) << 32 - (shiftamt); \
342 Variable_shift_double(Sextallp1(srcdstA), \
343 Sextallp2(srcdstB),shiftamt,Sextallp2(srcdstB)); \
344 Sextallp1(srcdstA) >>= shiftamt; \
345 } \
346 break; \
347 case 1: if (shiftamt > 0) { \
348 sticky = (Sextallp1(srcdstA) << 32 - (shiftamt)) | \
349 Sextallp2(srcdstB); \
350 } \
351 else { \
352 sticky = Sextallp2(srcdstB); \
353 } \
354 Sextallp2(srcdstB) = Sextallp1(srcdstA) >> shiftamt; \
355 Sextallp1(srcdstA) = 0; \
356 break; \
357 } \
358 if (sticky) Sglext_setone_lowmantissap2(srcdstB); \
359 }
360
361 /* The left argument is never smaller than the right argument */
362 #define Sglext_subtract(lefta,leftb,righta,rightb,resulta,resultb) \
363 if( Sextallp2(rightb) > Sextallp2(leftb) ) Sextallp1(lefta)--; \
364 Sextallp2(resultb) = Sextallp2(leftb) - Sextallp2(rightb); \
365 Sextallp1(resulta) = Sextallp1(lefta) - Sextallp1(righta)
366
367 #define Sglext_addition(lefta,leftb,righta,rightb,resulta,resultb) \
368 /* If the sum of the low words is less than either source, then \
369 * an overflow into the next word occurred. */ \
370 if ((Sextallp2(resultb) = Sextallp2(leftb)+Sextallp2(rightb)) < \
371 Sextallp2(rightb)) \
372 Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)+1; \
373 else Sextallp1(resulta) = Sextallp1(lefta)+Sextallp1(righta)
374
375
376 #define Sglext_arithrightshiftby1(srcdstA,srcdstB) \
377 Shiftdouble(Sextallp1(srcdstA),Sextallp2(srcdstB),1,Sextallp2(srcdstB)); \
378 Sextallp1(srcdstA) = (int)Sextallp1(srcdstA) >> 1
379
380 #define Sglext_leftshiftby8(valA,valB) \
381 Shiftdouble(Sextallp1(valA),Sextallp2(valB),24,Sextallp1(valA)); \
382 Sextallp2(valB) <<= 8
383 #define Sglext_leftshiftby4(valA,valB) \
384 Shiftdouble(Sextallp1(valA),Sextallp2(valB),28,Sextallp1(valA)); \
385 Sextallp2(valB) <<= 4
386 #define Sglext_leftshiftby3(valA,valB) \
387 Shiftdouble(Sextallp1(valA),Sextallp2(valB),29,Sextallp1(valA)); \
388 Sextallp2(valB) <<= 3
389 #define Sglext_leftshiftby2(valA,valB) \
390 Shiftdouble(Sextallp1(valA),Sextallp2(valB),30,Sextallp1(valA)); \
391 Sextallp2(valB) <<= 2
392 #define Sglext_leftshiftby1(valA,valB) \
393 Shiftdouble(Sextallp1(valA),Sextallp2(valB),31,Sextallp1(valA)); \
394 Sextallp2(valB) <<= 1
395
396 #define Sglext_rightshiftby4(valueA,valueB) \
397 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),4,Sextallp2(valueB)); \
398 Sextallp1(valueA) >>= 4
399 #define Sglext_rightshiftby3(valueA,valueB) \
400 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),3,Sextallp2(valueB)); \
401 Sextallp1(valueA) >>= 3
402 #define Sglext_rightshiftby1(valueA,valueB) \
403 Shiftdouble(Sextallp1(valueA),Sextallp2(valueB),1,Sextallp2(valueB)); \
404 Sextallp1(valueA) >>= 1
405
406 #define Sglext_xortointp1(left,right,result) Sgl_xortointp1(left,right,result)
407 #define Sglext_xorfromintp1(left,right,result) \
408 Sgl_xorfromintp1(left,right,result)
409 #define Sglext_copytoint_exponentmantissa(src,dest) \
410 Sgl_copytoint_exponentmantissa(src,dest)
411 #define Sglext_ismagnitudeless(signlessleft,signlessright) \
412 Sgl_ismagnitudeless(signlessleft,signlessright)
413
414 #define Sglext_set_sign(dbl_value,sign) Sgl_set_sign(dbl_value,sign)
415 #define Sglext_clear_signexponent_set_hidden(srcdst) \
416 Sgl_clear_signexponent_set_hidden(srcdst)
417 #define Sglext_clear_signexponent(srcdst) Sgl_clear_signexponent(srcdst)
418 #define Sglext_clear_sign(srcdst) Sgl_clear_sign(srcdst)
419 #define Sglext_isone_hidden(dbl_value) Sgl_isone_hidden(dbl_value)
420
421 #define Sglext_denormalize(opndp1,opndp2,exponent,is_tiny) \
422 {int sticky; \
423 is_tiny = TRUE; \
424 if (exponent == 0 && Sextallp2(opndp2)) { \
425 switch (Rounding_mode()) { \
426 case ROUNDPLUS: \
427 if (Sgl_iszero_sign(opndp1)) \
428 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
429 is_tiny = FALSE; \
430 break; \
431 case ROUNDMINUS: \
432 if (Sgl_isone_sign(opndp1)) { \
433 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
434 is_tiny = FALSE; \
435 } \
436 break; \
437 case ROUNDNEAREST: \
438 if (Sglext_isone_highp2(opndp2) && \
439 (Sglext_isone_lowp1(opndp1) || \
440 Sglext_isnotzero_low31p2(opndp2))) \
441 if (Sgl_isone_hiddenoverflow(opndp1 + 1)) \
442 is_tiny = FALSE; \
443 break; \
444 } \
445 } \
446 Sglext_clear_signexponent_set_hidden(opndp1); \
447 if (exponent >= (1-DBL_P)) { \
448 if (exponent >= -31) { \
449 if (exponent > -31) { \
450 sticky = Sextallp2(opndp2) << 31+exponent; \
451 Variable_shift_double(opndp1,opndp2,1-exponent,opndp2); \
452 Sextallp1(opndp1) >>= 1-exponent; \
453 } \
454 else { \
455 sticky = Sextallp2(opndp2); \
456 Sextallp2(opndp2) = Sextallp1(opndp1); \
457 Sextallp1(opndp1) = 0; \
458 } \
459 } \
460 else { \
461 sticky = (Sextallp1(opndp1) << 31+exponent) | \
462 Sextallp2(opndp2); \
463 Sextallp2(opndp2) = Sextallp1(opndp1) >> -31-exponent; \
464 Sextallp1(opndp1) = 0; \
465 } \
466 } \
467 else { \
468 sticky = Sextallp1(opndp1) | Sextallp2(opndp2); \
469 Sglext_setzero(opndp1,opndp2); \
470 } \
471 if (sticky) Sglext_setone_lowmantissap2(opndp2); \
472 exponent = 0; \
473 }
474
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