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/arch/parisc/math-emu/sgl_float.h

https://github.com/aicjofs/android_kernel_lge_v500_20d_f2fs
C Header | 486 lines | 397 code | 47 blank | 42 comment | 41 complexity | 0b939e0f3ec9daa37d1f01420b8e8c5a MD5 | raw file
  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 grabbing 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  }