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Diffstat (limited to 'arch/sparc/lib/sdiv.S')
-rw-r--r-- | arch/sparc/lib/sdiv.S | 381 |
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diff --git a/arch/sparc/lib/sdiv.S b/arch/sparc/lib/sdiv.S deleted file mode 100644 index f0a0d4e4db78..000000000000 --- a/arch/sparc/lib/sdiv.S +++ /dev/null | |||
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1 | /* | ||
2 | * sdiv.S: This routine was taken from glibc-1.09 and is covered | ||
3 | * by the GNU Library General Public License Version 2. | ||
4 | */ | ||
5 | |||
6 | |||
7 | /* This file is generated from divrem.m4; DO NOT EDIT! */ | ||
8 | /* | ||
9 | * Division and remainder, from Appendix E of the Sparc Version 8 | ||
10 | * Architecture Manual, with fixes from Gordon Irlam. | ||
11 | */ | ||
12 | |||
13 | /* | ||
14 | * Input: dividend and divisor in %o0 and %o1 respectively. | ||
15 | * | ||
16 | * m4 parameters: | ||
17 | * .div name of function to generate | ||
18 | * div div=div => %o0 / %o1; div=rem => %o0 % %o1 | ||
19 | * true true=true => signed; true=false => unsigned | ||
20 | * | ||
21 | * Algorithm parameters: | ||
22 | * N how many bits per iteration we try to get (4) | ||
23 | * WORDSIZE total number of bits (32) | ||
24 | * | ||
25 | * Derived constants: | ||
26 | * TOPBITS number of bits in the top decade of a number | ||
27 | * | ||
28 | * Important variables: | ||
29 | * Q the partial quotient under development (initially 0) | ||
30 | * R the remainder so far, initially the dividend | ||
31 | * ITER number of main division loop iterations required; | ||
32 | * equal to ceil(log2(quotient) / N). Note that this | ||
33 | * is the log base (2^N) of the quotient. | ||
34 | * V the current comparand, initially divisor*2^(ITER*N-1) | ||
35 | * | ||
36 | * Cost: | ||
37 | * Current estimate for non-large dividend is | ||
38 | * ceil(log2(quotient) / N) * (10 + 7N/2) + C | ||
39 | * A large dividend is one greater than 2^(31-TOPBITS) and takes a | ||
40 | * different path, as the upper bits of the quotient must be developed | ||
41 | * one bit at a time. | ||
42 | */ | ||
43 | |||
44 | |||
45 | .globl .div | ||
46 | .globl _Div | ||
47 | .div: | ||
48 | _Div: /* needed for export */ | ||
49 | ! compute sign of result; if neither is negative, no problem | ||
50 | orcc %o1, %o0, %g0 ! either negative? | ||
51 | bge 2f ! no, go do the divide | ||
52 | xor %o1, %o0, %g2 ! compute sign in any case | ||
53 | |||
54 | tst %o1 | ||
55 | bge 1f | ||
56 | tst %o0 | ||
57 | ! %o1 is definitely negative; %o0 might also be negative | ||
58 | bge 2f ! if %o0 not negative... | ||
59 | sub %g0, %o1, %o1 ! in any case, make %o1 nonneg | ||
60 | 1: ! %o0 is negative, %o1 is nonnegative | ||
61 | sub %g0, %o0, %o0 ! make %o0 nonnegative | ||
62 | 2: | ||
63 | |||
64 | ! Ready to divide. Compute size of quotient; scale comparand. | ||
65 | orcc %o1, %g0, %o5 | ||
66 | bne 1f | ||
67 | mov %o0, %o3 | ||
68 | |||
69 | ! Divide by zero trap. If it returns, return 0 (about as | ||
70 | ! wrong as possible, but that is what SunOS does...). | ||
71 | ta ST_DIV0 | ||
72 | retl | ||
73 | clr %o0 | ||
74 | |||
75 | 1: | ||
76 | cmp %o3, %o5 ! if %o1 exceeds %o0, done | ||
77 | blu Lgot_result ! (and algorithm fails otherwise) | ||
78 | clr %o2 | ||
79 | |||
80 | sethi %hi(1 << (32 - 4 - 1)), %g1 | ||
81 | |||
82 | cmp %o3, %g1 | ||
83 | blu Lnot_really_big | ||
84 | clr %o4 | ||
85 | |||
86 | ! Here the dividend is >= 2**(31-N) or so. We must be careful here, | ||
87 | ! as our usual N-at-a-shot divide step will cause overflow and havoc. | ||
88 | ! The number of bits in the result here is N*ITER+SC, where SC <= N. | ||
89 | ! Compute ITER in an unorthodox manner: know we need to shift V into | ||
90 | ! the top decade: so do not even bother to compare to R. | ||
91 | 1: | ||
92 | cmp %o5, %g1 | ||
93 | bgeu 3f | ||
94 | mov 1, %g7 | ||
95 | |||
96 | sll %o5, 4, %o5 | ||
97 | |||
98 | b 1b | ||
99 | add %o4, 1, %o4 | ||
100 | |||
101 | ! Now compute %g7. | ||
102 | 2: | ||
103 | addcc %o5, %o5, %o5 | ||
104 | bcc Lnot_too_big | ||
105 | add %g7, 1, %g7 | ||
106 | |||
107 | ! We get here if the %o1 overflowed while shifting. | ||
108 | ! This means that %o3 has the high-order bit set. | ||
109 | ! Restore %o5 and subtract from %o3. | ||
110 | sll %g1, 4, %g1 ! high order bit | ||
111 | srl %o5, 1, %o5 ! rest of %o5 | ||
112 | add %o5, %g1, %o5 | ||
113 | |||
114 | b Ldo_single_div | ||
115 | sub %g7, 1, %g7 | ||
116 | |||
117 | Lnot_too_big: | ||
118 | 3: | ||
119 | cmp %o5, %o3 | ||
120 | blu 2b | ||
121 | nop | ||
122 | |||
123 | be Ldo_single_div | ||
124 | nop | ||
125 | /* NB: these are commented out in the V8-Sparc manual as well */ | ||
126 | /* (I do not understand this) */ | ||
127 | ! %o5 > %o3: went too far: back up 1 step | ||
128 | ! srl %o5, 1, %o5 | ||
129 | ! dec %g7 | ||
130 | ! do single-bit divide steps | ||
131 | ! | ||
132 | ! We have to be careful here. We know that %o3 >= %o5, so we can do the | ||
133 | ! first divide step without thinking. BUT, the others are conditional, | ||
134 | ! and are only done if %o3 >= 0. Because both %o3 and %o5 may have the high- | ||
135 | ! order bit set in the first step, just falling into the regular | ||
136 | ! division loop will mess up the first time around. | ||
137 | ! So we unroll slightly... | ||
138 | Ldo_single_div: | ||
139 | subcc %g7, 1, %g7 | ||
140 | bl Lend_regular_divide | ||
141 | nop | ||
142 | |||
143 | sub %o3, %o5, %o3 | ||
144 | mov 1, %o2 | ||
145 | |||
146 | b Lend_single_divloop | ||
147 | nop | ||
148 | Lsingle_divloop: | ||
149 | sll %o2, 1, %o2 | ||
150 | |||
151 | bl 1f | ||
152 | srl %o5, 1, %o5 | ||
153 | ! %o3 >= 0 | ||
154 | sub %o3, %o5, %o3 | ||
155 | |||
156 | b 2f | ||
157 | add %o2, 1, %o2 | ||
158 | 1: ! %o3 < 0 | ||
159 | add %o3, %o5, %o3 | ||
160 | sub %o2, 1, %o2 | ||
161 | 2: | ||
162 | Lend_single_divloop: | ||
163 | subcc %g7, 1, %g7 | ||
164 | bge Lsingle_divloop | ||
165 | tst %o3 | ||
166 | |||
167 | b,a Lend_regular_divide | ||
168 | |||
169 | Lnot_really_big: | ||
170 | 1: | ||
171 | sll %o5, 4, %o5 | ||
172 | cmp %o5, %o3 | ||
173 | bleu 1b | ||
174 | addcc %o4, 1, %o4 | ||
175 | |||
176 | be Lgot_result | ||
177 | sub %o4, 1, %o4 | ||
178 | |||
179 | tst %o3 ! set up for initial iteration | ||
180 | Ldivloop: | ||
181 | sll %o2, 4, %o2 | ||
182 | ! depth 1, accumulated bits 0 | ||
183 | bl L.1.16 | ||
184 | srl %o5,1,%o5 | ||
185 | ! remainder is positive | ||
186 | subcc %o3,%o5,%o3 | ||
187 | ! depth 2, accumulated bits 1 | ||
188 | bl L.2.17 | ||
189 | srl %o5,1,%o5 | ||
190 | ! remainder is positive | ||
191 | subcc %o3,%o5,%o3 | ||
192 | ! depth 3, accumulated bits 3 | ||
193 | bl L.3.19 | ||
194 | srl %o5,1,%o5 | ||
195 | ! remainder is positive | ||
196 | subcc %o3,%o5,%o3 | ||
197 | ! depth 4, accumulated bits 7 | ||
198 | bl L.4.23 | ||
199 | srl %o5,1,%o5 | ||
200 | ! remainder is positive | ||
201 | subcc %o3,%o5,%o3 | ||
202 | b 9f | ||
203 | add %o2, (7*2+1), %o2 | ||
204 | |||
205 | L.4.23: | ||
206 | ! remainder is negative | ||
207 | addcc %o3,%o5,%o3 | ||
208 | b 9f | ||
209 | add %o2, (7*2-1), %o2 | ||
210 | |||
211 | L.3.19: | ||
212 | ! remainder is negative | ||
213 | addcc %o3,%o5,%o3 | ||
214 | ! depth 4, accumulated bits 5 | ||
215 | bl L.4.21 | ||
216 | srl %o5,1,%o5 | ||
217 | ! remainder is positive | ||
218 | subcc %o3,%o5,%o3 | ||
219 | b 9f | ||
220 | add %o2, (5*2+1), %o2 | ||
221 | |||
222 | L.4.21: | ||
223 | ! remainder is negative | ||
224 | addcc %o3,%o5,%o3 | ||
225 | b 9f | ||
226 | add %o2, (5*2-1), %o2 | ||
227 | |||
228 | L.2.17: | ||
229 | ! remainder is negative | ||
230 | addcc %o3,%o5,%o3 | ||
231 | ! depth 3, accumulated bits 1 | ||
232 | bl L.3.17 | ||
233 | srl %o5,1,%o5 | ||
234 | ! remainder is positive | ||
235 | subcc %o3,%o5,%o3 | ||
236 | ! depth 4, accumulated bits 3 | ||
237 | bl L.4.19 | ||
238 | srl %o5,1,%o5 | ||
239 | ! remainder is positive | ||
240 | subcc %o3,%o5,%o3 | ||
241 | b 9f | ||
242 | add %o2, (3*2+1), %o2 | ||
243 | |||
244 | L.4.19: | ||
245 | ! remainder is negative | ||
246 | addcc %o3,%o5,%o3 | ||
247 | b 9f | ||
248 | add %o2, (3*2-1), %o2 | ||
249 | |||
250 | |||
251 | L.3.17: | ||
252 | ! remainder is negative | ||
253 | addcc %o3,%o5,%o3 | ||
254 | ! depth 4, accumulated bits 1 | ||
255 | bl L.4.17 | ||
256 | srl %o5,1,%o5 | ||
257 | ! remainder is positive | ||
258 | subcc %o3,%o5,%o3 | ||
259 | b 9f | ||
260 | add %o2, (1*2+1), %o2 | ||
261 | |||
262 | L.4.17: | ||
263 | ! remainder is negative | ||
264 | addcc %o3,%o5,%o3 | ||
265 | b 9f | ||
266 | add %o2, (1*2-1), %o2 | ||
267 | |||
268 | L.1.16: | ||
269 | ! remainder is negative | ||
270 | addcc %o3,%o5,%o3 | ||
271 | ! depth 2, accumulated bits -1 | ||
272 | bl L.2.15 | ||
273 | srl %o5,1,%o5 | ||
274 | ! remainder is positive | ||
275 | subcc %o3,%o5,%o3 | ||
276 | ! depth 3, accumulated bits -1 | ||
277 | bl L.3.15 | ||
278 | srl %o5,1,%o5 | ||
279 | ! remainder is positive | ||
280 | subcc %o3,%o5,%o3 | ||
281 | ! depth 4, accumulated bits -1 | ||
282 | bl L.4.15 | ||
283 | srl %o5,1,%o5 | ||
284 | ! remainder is positive | ||
285 | subcc %o3,%o5,%o3 | ||
286 | b 9f | ||
287 | add %o2, (-1*2+1), %o2 | ||
288 | |||
289 | L.4.15: | ||
290 | ! remainder is negative | ||
291 | addcc %o3,%o5,%o3 | ||
292 | b 9f | ||
293 | add %o2, (-1*2-1), %o2 | ||
294 | |||
295 | L.3.15: | ||
296 | ! remainder is negative | ||
297 | addcc %o3,%o5,%o3 | ||
298 | ! depth 4, accumulated bits -3 | ||
299 | bl L.4.13 | ||
300 | srl %o5,1,%o5 | ||
301 | ! remainder is positive | ||
302 | subcc %o3,%o5,%o3 | ||
303 | b 9f | ||
304 | add %o2, (-3*2+1), %o2 | ||
305 | |||
306 | L.4.13: | ||
307 | ! remainder is negative | ||
308 | addcc %o3,%o5,%o3 | ||
309 | b 9f | ||
310 | add %o2, (-3*2-1), %o2 | ||
311 | |||
312 | L.2.15: | ||
313 | ! remainder is negative | ||
314 | addcc %o3,%o5,%o3 | ||
315 | ! depth 3, accumulated bits -3 | ||
316 | bl L.3.13 | ||
317 | srl %o5,1,%o5 | ||
318 | ! remainder is positive | ||
319 | subcc %o3,%o5,%o3 | ||
320 | ! depth 4, accumulated bits -5 | ||
321 | bl L.4.11 | ||
322 | srl %o5,1,%o5 | ||
323 | ! remainder is positive | ||
324 | subcc %o3,%o5,%o3 | ||
325 | b 9f | ||
326 | add %o2, (-5*2+1), %o2 | ||
327 | |||
328 | L.4.11: | ||
329 | ! remainder is negative | ||
330 | addcc %o3,%o5,%o3 | ||
331 | b 9f | ||
332 | add %o2, (-5*2-1), %o2 | ||
333 | |||
334 | L.3.13: | ||
335 | ! remainder is negative | ||
336 | addcc %o3,%o5,%o3 | ||
337 | ! depth 4, accumulated bits -7 | ||
338 | bl L.4.9 | ||
339 | srl %o5,1,%o5 | ||
340 | ! remainder is positive | ||
341 | subcc %o3,%o5,%o3 | ||
342 | b 9f | ||
343 | add %o2, (-7*2+1), %o2 | ||
344 | |||
345 | L.4.9: | ||
346 | ! remainder is negative | ||
347 | addcc %o3,%o5,%o3 | ||
348 | b 9f | ||
349 | add %o2, (-7*2-1), %o2 | ||
350 | |||
351 | 9: | ||
352 | Lend_regular_divide: | ||
353 | subcc %o4, 1, %o4 | ||
354 | bge Ldivloop | ||
355 | tst %o3 | ||
356 | |||
357 | bl,a Lgot_result | ||
358 | ! non-restoring fixup here (one instruction only!) | ||
359 | sub %o2, 1, %o2 | ||
360 | |||
361 | Lgot_result: | ||
362 | ! check to see if answer should be < 0 | ||
363 | tst %g2 | ||
364 | bl,a 1f | ||
365 | sub %g0, %o2, %o2 | ||
366 | 1: | ||
367 | retl | ||
368 | mov %o2, %o0 | ||
369 | |||
370 | .globl .div_patch | ||
371 | .div_patch: | ||
372 | sra %o0, 0x1f, %o2 | ||
373 | wr %o2, 0x0, %y | ||
374 | nop | ||
375 | nop | ||
376 | nop | ||
377 | sdivcc %o0, %o1, %o0 | ||
378 | bvs,a 1f | ||
379 | xnor %o0, %g0, %o0 | ||
380 | 1: retl | ||
381 | nop | ||