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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/vfp/vfpsingle.c | |
3 | * | |
4 | * This code is derived in part from John R. Housers softfloat library, which | |
5 | * carries the following notice: | |
6 | * | |
7 | * =========================================================================== | |
8 | * This C source file is part of the SoftFloat IEC/IEEE Floating-point | |
9 | * Arithmetic Package, Release 2. | |
10 | * | |
11 | * Written by John R. Hauser. This work was made possible in part by the | |
12 | * International Computer Science Institute, located at Suite 600, 1947 Center | |
13 | * Street, Berkeley, California 94704. Funding was partially provided by the | |
14 | * National Science Foundation under grant MIP-9311980. The original version | |
15 | * of this code was written as part of a project to build a fixed-point vector | |
16 | * processor in collaboration with the University of California at Berkeley, | |
17 | * overseen by Profs. Nelson Morgan and John Wawrzynek. More information | |
18 | * is available through the web page `http://HTTP.CS.Berkeley.EDU/~jhauser/ | |
19 | * arithmetic/softfloat.html'. | |
20 | * | |
21 | * THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort | |
22 | * has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT | |
23 | * TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO | |
24 | * PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY | |
25 | * AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE. | |
26 | * | |
27 | * Derivative works are acceptable, even for commercial purposes, so long as | |
28 | * (1) they include prominent notice that the work is derivative, and (2) they | |
29 | * include prominent notice akin to these three paragraphs for those parts of | |
30 | * this code that are retained. | |
31 | * =========================================================================== | |
32 | */ | |
33 | #include <linux/kernel.h> | |
34 | #include <linux/bitops.h> | |
438a7616 RK |
35 | |
36 | #include <asm/div64.h> | |
1da177e4 LT |
37 | #include <asm/ptrace.h> |
38 | #include <asm/vfp.h> | |
39 | ||
40 | #include "vfpinstr.h" | |
41 | #include "vfp.h" | |
42 | ||
43 | static struct vfp_single vfp_single_default_qnan = { | |
44 | .exponent = 255, | |
45 | .sign = 0, | |
46 | .significand = VFP_SINGLE_SIGNIFICAND_QNAN, | |
47 | }; | |
48 | ||
49 | static void vfp_single_dump(const char *str, struct vfp_single *s) | |
50 | { | |
51 | pr_debug("VFP: %s: sign=%d exponent=%d significand=%08x\n", | |
52 | str, s->sign != 0, s->exponent, s->significand); | |
53 | } | |
54 | ||
55 | static void vfp_single_normalise_denormal(struct vfp_single *vs) | |
56 | { | |
57 | int bits = 31 - fls(vs->significand); | |
58 | ||
59 | vfp_single_dump("normalise_denormal: in", vs); | |
60 | ||
61 | if (bits) { | |
62 | vs->exponent -= bits - 1; | |
63 | vs->significand <<= bits; | |
64 | } | |
65 | ||
66 | vfp_single_dump("normalise_denormal: out", vs); | |
67 | } | |
68 | ||
69 | #ifndef DEBUG | |
70 | #define vfp_single_normaliseround(sd,vsd,fpscr,except,func) __vfp_single_normaliseround(sd,vsd,fpscr,except) | |
71 | u32 __vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions) | |
72 | #else | |
73 | u32 vfp_single_normaliseround(int sd, struct vfp_single *vs, u32 fpscr, u32 exceptions, const char *func) | |
74 | #endif | |
75 | { | |
76 | u32 significand, incr, rmode; | |
77 | int exponent, shift, underflow; | |
78 | ||
79 | vfp_single_dump("pack: in", vs); | |
80 | ||
81 | /* | |
82 | * Infinities and NaNs are a special case. | |
83 | */ | |
84 | if (vs->exponent == 255 && (vs->significand == 0 || exceptions)) | |
85 | goto pack; | |
86 | ||
87 | /* | |
88 | * Special-case zero. | |
89 | */ | |
90 | if (vs->significand == 0) { | |
91 | vs->exponent = 0; | |
92 | goto pack; | |
93 | } | |
94 | ||
95 | exponent = vs->exponent; | |
96 | significand = vs->significand; | |
97 | ||
98 | /* | |
99 | * Normalise first. Note that we shift the significand up to | |
100 | * bit 31, so we have VFP_SINGLE_LOW_BITS + 1 below the least | |
101 | * significant bit. | |
102 | */ | |
103 | shift = 32 - fls(significand); | |
104 | if (shift < 32 && shift) { | |
105 | exponent -= shift; | |
106 | significand <<= shift; | |
107 | } | |
108 | ||
109 | #ifdef DEBUG | |
110 | vs->exponent = exponent; | |
111 | vs->significand = significand; | |
112 | vfp_single_dump("pack: normalised", vs); | |
113 | #endif | |
114 | ||
115 | /* | |
116 | * Tiny number? | |
117 | */ | |
118 | underflow = exponent < 0; | |
119 | if (underflow) { | |
120 | significand = vfp_shiftright32jamming(significand, -exponent); | |
121 | exponent = 0; | |
122 | #ifdef DEBUG | |
123 | vs->exponent = exponent; | |
124 | vs->significand = significand; | |
125 | vfp_single_dump("pack: tiny number", vs); | |
126 | #endif | |
127 | if (!(significand & ((1 << (VFP_SINGLE_LOW_BITS + 1)) - 1))) | |
128 | underflow = 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * Select rounding increment. | |
133 | */ | |
134 | incr = 0; | |
135 | rmode = fpscr & FPSCR_RMODE_MASK; | |
136 | ||
137 | if (rmode == FPSCR_ROUND_NEAREST) { | |
138 | incr = 1 << VFP_SINGLE_LOW_BITS; | |
139 | if ((significand & (1 << (VFP_SINGLE_LOW_BITS + 1))) == 0) | |
140 | incr -= 1; | |
141 | } else if (rmode == FPSCR_ROUND_TOZERO) { | |
142 | incr = 0; | |
143 | } else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vs->sign != 0)) | |
144 | incr = (1 << (VFP_SINGLE_LOW_BITS + 1)) - 1; | |
145 | ||
146 | pr_debug("VFP: rounding increment = 0x%08x\n", incr); | |
147 | ||
148 | /* | |
149 | * Is our rounding going to overflow? | |
150 | */ | |
151 | if ((significand + incr) < significand) { | |
152 | exponent += 1; | |
153 | significand = (significand >> 1) | (significand & 1); | |
154 | incr >>= 1; | |
155 | #ifdef DEBUG | |
156 | vs->exponent = exponent; | |
157 | vs->significand = significand; | |
158 | vfp_single_dump("pack: overflow", vs); | |
159 | #endif | |
160 | } | |
161 | ||
162 | /* | |
163 | * If any of the low bits (which will be shifted out of the | |
164 | * number) are non-zero, the result is inexact. | |
165 | */ | |
166 | if (significand & ((1 << (VFP_SINGLE_LOW_BITS + 1)) - 1)) | |
167 | exceptions |= FPSCR_IXC; | |
168 | ||
169 | /* | |
170 | * Do our rounding. | |
171 | */ | |
172 | significand += incr; | |
173 | ||
174 | /* | |
175 | * Infinity? | |
176 | */ | |
177 | if (exponent >= 254) { | |
178 | exceptions |= FPSCR_OFC | FPSCR_IXC; | |
179 | if (incr == 0) { | |
180 | vs->exponent = 253; | |
181 | vs->significand = 0x7fffffff; | |
182 | } else { | |
183 | vs->exponent = 255; /* infinity */ | |
184 | vs->significand = 0; | |
185 | } | |
186 | } else { | |
187 | if (significand >> (VFP_SINGLE_LOW_BITS + 1) == 0) | |
188 | exponent = 0; | |
189 | if (exponent || significand > 0x80000000) | |
190 | underflow = 0; | |
191 | if (underflow) | |
192 | exceptions |= FPSCR_UFC; | |
193 | vs->exponent = exponent; | |
194 | vs->significand = significand >> 1; | |
195 | } | |
196 | ||
197 | pack: | |
198 | vfp_single_dump("pack: final", vs); | |
199 | { | |
200 | s32 d = vfp_single_pack(vs); | |
42d3fb5a | 201 | #ifdef DEBUG |
1da177e4 LT |
202 | pr_debug("VFP: %s: d(s%d)=%08x exceptions=%08x\n", func, |
203 | sd, d, exceptions); | |
42d3fb5a | 204 | #endif |
0355b3e0 | 205 | vfp_put_float(d, sd); |
1da177e4 LT |
206 | } |
207 | ||
928bd1b4 | 208 | return exceptions; |
1da177e4 LT |
209 | } |
210 | ||
211 | /* | |
212 | * Propagate the NaN, setting exceptions if it is signalling. | |
213 | * 'n' is always a NaN. 'm' may be a number, NaN or infinity. | |
214 | */ | |
215 | static u32 | |
216 | vfp_propagate_nan(struct vfp_single *vsd, struct vfp_single *vsn, | |
217 | struct vfp_single *vsm, u32 fpscr) | |
218 | { | |
219 | struct vfp_single *nan; | |
220 | int tn, tm = 0; | |
221 | ||
222 | tn = vfp_single_type(vsn); | |
223 | ||
224 | if (vsm) | |
225 | tm = vfp_single_type(vsm); | |
226 | ||
227 | if (fpscr & FPSCR_DEFAULT_NAN) | |
228 | /* | |
229 | * Default NaN mode - always returns a quiet NaN | |
230 | */ | |
231 | nan = &vfp_single_default_qnan; | |
232 | else { | |
233 | /* | |
234 | * Contemporary mode - select the first signalling | |
235 | * NAN, or if neither are signalling, the first | |
236 | * quiet NAN. | |
237 | */ | |
238 | if (tn == VFP_SNAN || (tm != VFP_SNAN && tn == VFP_QNAN)) | |
239 | nan = vsn; | |
240 | else | |
241 | nan = vsm; | |
242 | /* | |
243 | * Make the NaN quiet. | |
244 | */ | |
245 | nan->significand |= VFP_SINGLE_SIGNIFICAND_QNAN; | |
246 | } | |
247 | ||
248 | *vsd = *nan; | |
249 | ||
250 | /* | |
251 | * If one was a signalling NAN, raise invalid operation. | |
252 | */ | |
253 | return tn == VFP_SNAN || tm == VFP_SNAN ? FPSCR_IOC : VFP_NAN_FLAG; | |
254 | } | |
255 | ||
256 | ||
257 | /* | |
258 | * Extended operations | |
259 | */ | |
260 | static u32 vfp_single_fabs(int sd, int unused, s32 m, u32 fpscr) | |
261 | { | |
0355b3e0 | 262 | vfp_put_float(vfp_single_packed_abs(m), sd); |
1da177e4 LT |
263 | return 0; |
264 | } | |
265 | ||
266 | static u32 vfp_single_fcpy(int sd, int unused, s32 m, u32 fpscr) | |
267 | { | |
0355b3e0 | 268 | vfp_put_float(m, sd); |
1da177e4 LT |
269 | return 0; |
270 | } | |
271 | ||
272 | static u32 vfp_single_fneg(int sd, int unused, s32 m, u32 fpscr) | |
273 | { | |
0355b3e0 | 274 | vfp_put_float(vfp_single_packed_negate(m), sd); |
1da177e4 LT |
275 | return 0; |
276 | } | |
277 | ||
278 | static const u16 sqrt_oddadjust[] = { | |
279 | 0x0004, 0x0022, 0x005d, 0x00b1, 0x011d, 0x019f, 0x0236, 0x02e0, | |
280 | 0x039c, 0x0468, 0x0545, 0x0631, 0x072b, 0x0832, 0x0946, 0x0a67 | |
281 | }; | |
282 | ||
283 | static const u16 sqrt_evenadjust[] = { | |
284 | 0x0a2d, 0x08af, 0x075a, 0x0629, 0x051a, 0x0429, 0x0356, 0x029e, | |
285 | 0x0200, 0x0179, 0x0109, 0x00af, 0x0068, 0x0034, 0x0012, 0x0002 | |
286 | }; | |
287 | ||
288 | u32 vfp_estimate_sqrt_significand(u32 exponent, u32 significand) | |
289 | { | |
290 | int index; | |
291 | u32 z, a; | |
292 | ||
293 | if ((significand & 0xc0000000) != 0x40000000) { | |
294 | printk(KERN_WARNING "VFP: estimate_sqrt: invalid significand\n"); | |
295 | } | |
296 | ||
297 | a = significand << 1; | |
298 | index = (a >> 27) & 15; | |
299 | if (exponent & 1) { | |
300 | z = 0x4000 + (a >> 17) - sqrt_oddadjust[index]; | |
301 | z = ((a / z) << 14) + (z << 15); | |
302 | a >>= 1; | |
303 | } else { | |
304 | z = 0x8000 + (a >> 17) - sqrt_evenadjust[index]; | |
305 | z = a / z + z; | |
306 | z = (z >= 0x20000) ? 0xffff8000 : (z << 15); | |
307 | if (z <= a) | |
308 | return (s32)a >> 1; | |
309 | } | |
438a7616 RK |
310 | { |
311 | u64 v = (u64)a << 31; | |
312 | do_div(v, z); | |
313 | return v + (z >> 1); | |
314 | } | |
1da177e4 LT |
315 | } |
316 | ||
317 | static u32 vfp_single_fsqrt(int sd, int unused, s32 m, u32 fpscr) | |
318 | { | |
319 | struct vfp_single vsm, vsd; | |
320 | int ret, tm; | |
321 | ||
322 | vfp_single_unpack(&vsm, m); | |
323 | tm = vfp_single_type(&vsm); | |
324 | if (tm & (VFP_NAN|VFP_INFINITY)) { | |
325 | struct vfp_single *vsp = &vsd; | |
326 | ||
327 | if (tm & VFP_NAN) | |
328 | ret = vfp_propagate_nan(vsp, &vsm, NULL, fpscr); | |
329 | else if (vsm.sign == 0) { | |
330 | sqrt_copy: | |
331 | vsp = &vsm; | |
332 | ret = 0; | |
333 | } else { | |
334 | sqrt_invalid: | |
335 | vsp = &vfp_single_default_qnan; | |
336 | ret = FPSCR_IOC; | |
337 | } | |
0355b3e0 | 338 | vfp_put_float(vfp_single_pack(vsp), sd); |
1da177e4 LT |
339 | return ret; |
340 | } | |
341 | ||
342 | /* | |
343 | * sqrt(+/- 0) == +/- 0 | |
344 | */ | |
345 | if (tm & VFP_ZERO) | |
346 | goto sqrt_copy; | |
347 | ||
348 | /* | |
349 | * Normalise a denormalised number | |
350 | */ | |
351 | if (tm & VFP_DENORMAL) | |
352 | vfp_single_normalise_denormal(&vsm); | |
353 | ||
354 | /* | |
355 | * sqrt(<0) = invalid | |
356 | */ | |
357 | if (vsm.sign) | |
358 | goto sqrt_invalid; | |
359 | ||
360 | vfp_single_dump("sqrt", &vsm); | |
361 | ||
362 | /* | |
363 | * Estimate the square root. | |
364 | */ | |
365 | vsd.sign = 0; | |
366 | vsd.exponent = ((vsm.exponent - 127) >> 1) + 127; | |
367 | vsd.significand = vfp_estimate_sqrt_significand(vsm.exponent, vsm.significand) + 2; | |
368 | ||
369 | vfp_single_dump("sqrt estimate", &vsd); | |
370 | ||
371 | /* | |
372 | * And now adjust. | |
373 | */ | |
374 | if ((vsd.significand & VFP_SINGLE_LOW_BITS_MASK) <= 5) { | |
375 | if (vsd.significand < 2) { | |
376 | vsd.significand = 0xffffffff; | |
377 | } else { | |
378 | u64 term; | |
379 | s64 rem; | |
380 | vsm.significand <<= !(vsm.exponent & 1); | |
381 | term = (u64)vsd.significand * vsd.significand; | |
382 | rem = ((u64)vsm.significand << 32) - term; | |
383 | ||
384 | pr_debug("VFP: term=%016llx rem=%016llx\n", term, rem); | |
385 | ||
386 | while (rem < 0) { | |
387 | vsd.significand -= 1; | |
388 | rem += ((u64)vsd.significand << 1) | 1; | |
389 | } | |
390 | vsd.significand |= rem != 0; | |
391 | } | |
392 | } | |
393 | vsd.significand = vfp_shiftright32jamming(vsd.significand, 1); | |
394 | ||
395 | return vfp_single_normaliseround(sd, &vsd, fpscr, 0, "fsqrt"); | |
396 | } | |
397 | ||
398 | /* | |
399 | * Equal := ZC | |
400 | * Less than := N | |
401 | * Greater than := C | |
402 | * Unordered := CV | |
403 | */ | |
404 | static u32 vfp_compare(int sd, int signal_on_qnan, s32 m, u32 fpscr) | |
405 | { | |
406 | s32 d; | |
407 | u32 ret = 0; | |
408 | ||
409 | d = vfp_get_float(sd); | |
410 | if (vfp_single_packed_exponent(m) == 255 && vfp_single_packed_mantissa(m)) { | |
411 | ret |= FPSCR_C | FPSCR_V; | |
412 | if (signal_on_qnan || !(vfp_single_packed_mantissa(m) & (1 << (VFP_SINGLE_MANTISSA_BITS - 1)))) | |
413 | /* | |
414 | * Signalling NaN, or signalling on quiet NaN | |
415 | */ | |
416 | ret |= FPSCR_IOC; | |
417 | } | |
418 | ||
419 | if (vfp_single_packed_exponent(d) == 255 && vfp_single_packed_mantissa(d)) { | |
420 | ret |= FPSCR_C | FPSCR_V; | |
421 | if (signal_on_qnan || !(vfp_single_packed_mantissa(d) & (1 << (VFP_SINGLE_MANTISSA_BITS - 1)))) | |
422 | /* | |
423 | * Signalling NaN, or signalling on quiet NaN | |
424 | */ | |
425 | ret |= FPSCR_IOC; | |
426 | } | |
427 | ||
428 | if (ret == 0) { | |
429 | if (d == m || vfp_single_packed_abs(d | m) == 0) { | |
430 | /* | |
431 | * equal | |
432 | */ | |
433 | ret |= FPSCR_Z | FPSCR_C; | |
434 | } else if (vfp_single_packed_sign(d ^ m)) { | |
435 | /* | |
436 | * different signs | |
437 | */ | |
438 | if (vfp_single_packed_sign(d)) | |
439 | /* | |
440 | * d is negative, so d < m | |
441 | */ | |
442 | ret |= FPSCR_N; | |
443 | else | |
444 | /* | |
445 | * d is positive, so d > m | |
446 | */ | |
447 | ret |= FPSCR_C; | |
448 | } else if ((vfp_single_packed_sign(d) != 0) ^ (d < m)) { | |
449 | /* | |
450 | * d < m | |
451 | */ | |
452 | ret |= FPSCR_N; | |
453 | } else if ((vfp_single_packed_sign(d) != 0) ^ (d > m)) { | |
454 | /* | |
455 | * d > m | |
456 | */ | |
457 | ret |= FPSCR_C; | |
458 | } | |
459 | } | |
460 | return ret; | |
461 | } | |
462 | ||
463 | static u32 vfp_single_fcmp(int sd, int unused, s32 m, u32 fpscr) | |
464 | { | |
465 | return vfp_compare(sd, 0, m, fpscr); | |
466 | } | |
467 | ||
468 | static u32 vfp_single_fcmpe(int sd, int unused, s32 m, u32 fpscr) | |
469 | { | |
470 | return vfp_compare(sd, 1, m, fpscr); | |
471 | } | |
472 | ||
473 | static u32 vfp_single_fcmpz(int sd, int unused, s32 m, u32 fpscr) | |
474 | { | |
475 | return vfp_compare(sd, 0, 0, fpscr); | |
476 | } | |
477 | ||
478 | static u32 vfp_single_fcmpez(int sd, int unused, s32 m, u32 fpscr) | |
479 | { | |
480 | return vfp_compare(sd, 1, 0, fpscr); | |
481 | } | |
482 | ||
483 | static u32 vfp_single_fcvtd(int dd, int unused, s32 m, u32 fpscr) | |
484 | { | |
485 | struct vfp_single vsm; | |
486 | struct vfp_double vdd; | |
487 | int tm; | |
488 | u32 exceptions = 0; | |
489 | ||
490 | vfp_single_unpack(&vsm, m); | |
491 | ||
492 | tm = vfp_single_type(&vsm); | |
493 | ||
494 | /* | |
495 | * If we have a signalling NaN, signal invalid operation. | |
496 | */ | |
497 | if (tm == VFP_SNAN) | |
498 | exceptions = FPSCR_IOC; | |
499 | ||
500 | if (tm & VFP_DENORMAL) | |
501 | vfp_single_normalise_denormal(&vsm); | |
502 | ||
503 | vdd.sign = vsm.sign; | |
504 | vdd.significand = (u64)vsm.significand << 32; | |
505 | ||
506 | /* | |
507 | * If we have an infinity or NaN, the exponent must be 2047. | |
508 | */ | |
509 | if (tm & (VFP_INFINITY|VFP_NAN)) { | |
510 | vdd.exponent = 2047; | |
b53a2b41 | 511 | if (tm == VFP_QNAN) |
1da177e4 LT |
512 | vdd.significand |= VFP_DOUBLE_SIGNIFICAND_QNAN; |
513 | goto pack_nan; | |
514 | } else if (tm & VFP_ZERO) | |
515 | vdd.exponent = 0; | |
516 | else | |
517 | vdd.exponent = vsm.exponent + (1023 - 127); | |
518 | ||
1da177e4 LT |
519 | return vfp_double_normaliseround(dd, &vdd, fpscr, exceptions, "fcvtd"); |
520 | ||
521 | pack_nan: | |
0355b3e0 | 522 | vfp_put_double(vfp_double_pack(&vdd), dd); |
1da177e4 LT |
523 | return exceptions; |
524 | } | |
525 | ||
526 | static u32 vfp_single_fuito(int sd, int unused, s32 m, u32 fpscr) | |
527 | { | |
528 | struct vfp_single vs; | |
529 | ||
530 | vs.sign = 0; | |
531 | vs.exponent = 127 + 31 - 1; | |
532 | vs.significand = (u32)m; | |
533 | ||
534 | return vfp_single_normaliseround(sd, &vs, fpscr, 0, "fuito"); | |
535 | } | |
536 | ||
537 | static u32 vfp_single_fsito(int sd, int unused, s32 m, u32 fpscr) | |
538 | { | |
539 | struct vfp_single vs; | |
540 | ||
541 | vs.sign = (m & 0x80000000) >> 16; | |
542 | vs.exponent = 127 + 31 - 1; | |
543 | vs.significand = vs.sign ? -m : m; | |
544 | ||
545 | return vfp_single_normaliseround(sd, &vs, fpscr, 0, "fsito"); | |
546 | } | |
547 | ||
548 | static u32 vfp_single_ftoui(int sd, int unused, s32 m, u32 fpscr) | |
549 | { | |
550 | struct vfp_single vsm; | |
551 | u32 d, exceptions = 0; | |
552 | int rmode = fpscr & FPSCR_RMODE_MASK; | |
553 | int tm; | |
554 | ||
555 | vfp_single_unpack(&vsm, m); | |
556 | vfp_single_dump("VSM", &vsm); | |
557 | ||
558 | /* | |
559 | * Do we have a denormalised number? | |
560 | */ | |
561 | tm = vfp_single_type(&vsm); | |
562 | if (tm & VFP_DENORMAL) | |
563 | exceptions |= FPSCR_IDC; | |
564 | ||
565 | if (tm & VFP_NAN) | |
566 | vsm.sign = 0; | |
567 | ||
568 | if (vsm.exponent >= 127 + 32) { | |
569 | d = vsm.sign ? 0 : 0xffffffff; | |
570 | exceptions = FPSCR_IOC; | |
571 | } else if (vsm.exponent >= 127 - 1) { | |
572 | int shift = 127 + 31 - vsm.exponent; | |
573 | u32 rem, incr = 0; | |
574 | ||
575 | /* | |
576 | * 2^0 <= m < 2^32-2^8 | |
577 | */ | |
578 | d = (vsm.significand << 1) >> shift; | |
579 | rem = vsm.significand << (33 - shift); | |
580 | ||
581 | if (rmode == FPSCR_ROUND_NEAREST) { | |
582 | incr = 0x80000000; | |
583 | if ((d & 1) == 0) | |
584 | incr -= 1; | |
585 | } else if (rmode == FPSCR_ROUND_TOZERO) { | |
586 | incr = 0; | |
587 | } else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vsm.sign != 0)) { | |
588 | incr = ~0; | |
589 | } | |
590 | ||
591 | if ((rem + incr) < rem) { | |
592 | if (d < 0xffffffff) | |
593 | d += 1; | |
594 | else | |
595 | exceptions |= FPSCR_IOC; | |
596 | } | |
597 | ||
598 | if (d && vsm.sign) { | |
599 | d = 0; | |
600 | exceptions |= FPSCR_IOC; | |
601 | } else if (rem) | |
602 | exceptions |= FPSCR_IXC; | |
603 | } else { | |
604 | d = 0; | |
605 | if (vsm.exponent | vsm.significand) { | |
606 | exceptions |= FPSCR_IXC; | |
607 | if (rmode == FPSCR_ROUND_PLUSINF && vsm.sign == 0) | |
608 | d = 1; | |
609 | else if (rmode == FPSCR_ROUND_MINUSINF && vsm.sign) { | |
610 | d = 0; | |
611 | exceptions |= FPSCR_IOC; | |
612 | } | |
613 | } | |
614 | } | |
615 | ||
616 | pr_debug("VFP: ftoui: d(s%d)=%08x exceptions=%08x\n", sd, d, exceptions); | |
617 | ||
0355b3e0 | 618 | vfp_put_float(d, sd); |
1da177e4 LT |
619 | |
620 | return exceptions; | |
621 | } | |
622 | ||
623 | static u32 vfp_single_ftouiz(int sd, int unused, s32 m, u32 fpscr) | |
624 | { | |
625 | return vfp_single_ftoui(sd, unused, m, FPSCR_ROUND_TOZERO); | |
626 | } | |
627 | ||
628 | static u32 vfp_single_ftosi(int sd, int unused, s32 m, u32 fpscr) | |
629 | { | |
630 | struct vfp_single vsm; | |
631 | u32 d, exceptions = 0; | |
632 | int rmode = fpscr & FPSCR_RMODE_MASK; | |
1320a80d | 633 | int tm; |
1da177e4 LT |
634 | |
635 | vfp_single_unpack(&vsm, m); | |
636 | vfp_single_dump("VSM", &vsm); | |
637 | ||
638 | /* | |
639 | * Do we have a denormalised number? | |
640 | */ | |
1320a80d | 641 | tm = vfp_single_type(&vsm); |
1da177e4 LT |
642 | if (vfp_single_type(&vsm) & VFP_DENORMAL) |
643 | exceptions |= FPSCR_IDC; | |
644 | ||
1320a80d CM |
645 | if (tm & VFP_NAN) { |
646 | d = 0; | |
647 | exceptions |= FPSCR_IOC; | |
648 | } else if (vsm.exponent >= 127 + 32) { | |
1da177e4 LT |
649 | /* |
650 | * m >= 2^31-2^7: invalid | |
651 | */ | |
652 | d = 0x7fffffff; | |
653 | if (vsm.sign) | |
654 | d = ~d; | |
655 | exceptions |= FPSCR_IOC; | |
656 | } else if (vsm.exponent >= 127 - 1) { | |
657 | int shift = 127 + 31 - vsm.exponent; | |
658 | u32 rem, incr = 0; | |
659 | ||
660 | /* 2^0 <= m <= 2^31-2^7 */ | |
661 | d = (vsm.significand << 1) >> shift; | |
662 | rem = vsm.significand << (33 - shift); | |
663 | ||
664 | if (rmode == FPSCR_ROUND_NEAREST) { | |
665 | incr = 0x80000000; | |
666 | if ((d & 1) == 0) | |
667 | incr -= 1; | |
668 | } else if (rmode == FPSCR_ROUND_TOZERO) { | |
669 | incr = 0; | |
670 | } else if ((rmode == FPSCR_ROUND_PLUSINF) ^ (vsm.sign != 0)) { | |
671 | incr = ~0; | |
672 | } | |
673 | ||
674 | if ((rem + incr) < rem && d < 0xffffffff) | |
675 | d += 1; | |
676 | if (d > 0x7fffffff + (vsm.sign != 0)) { | |
677 | d = 0x7fffffff + (vsm.sign != 0); | |
678 | exceptions |= FPSCR_IOC; | |
679 | } else if (rem) | |
680 | exceptions |= FPSCR_IXC; | |
681 | ||
682 | if (vsm.sign) | |
683 | d = -d; | |
684 | } else { | |
685 | d = 0; | |
686 | if (vsm.exponent | vsm.significand) { | |
687 | exceptions |= FPSCR_IXC; | |
688 | if (rmode == FPSCR_ROUND_PLUSINF && vsm.sign == 0) | |
689 | d = 1; | |
690 | else if (rmode == FPSCR_ROUND_MINUSINF && vsm.sign) | |
691 | d = -1; | |
692 | } | |
693 | } | |
694 | ||
695 | pr_debug("VFP: ftosi: d(s%d)=%08x exceptions=%08x\n", sd, d, exceptions); | |
696 | ||
0355b3e0 | 697 | vfp_put_float((s32)d, sd); |
1da177e4 LT |
698 | |
699 | return exceptions; | |
700 | } | |
701 | ||
702 | static u32 vfp_single_ftosiz(int sd, int unused, s32 m, u32 fpscr) | |
703 | { | |
704 | return vfp_single_ftosi(sd, unused, m, FPSCR_ROUND_TOZERO); | |
705 | } | |
706 | ||
4cc9bd2e | 707 | static struct op fops_ext[32] = { |
baf97ce6 RK |
708 | [FEXT_TO_IDX(FEXT_FCPY)] = { vfp_single_fcpy, 0 }, |
709 | [FEXT_TO_IDX(FEXT_FABS)] = { vfp_single_fabs, 0 }, | |
710 | [FEXT_TO_IDX(FEXT_FNEG)] = { vfp_single_fneg, 0 }, | |
711 | [FEXT_TO_IDX(FEXT_FSQRT)] = { vfp_single_fsqrt, 0 }, | |
712 | [FEXT_TO_IDX(FEXT_FCMP)] = { vfp_single_fcmp, OP_SCALAR }, | |
713 | [FEXT_TO_IDX(FEXT_FCMPE)] = { vfp_single_fcmpe, OP_SCALAR }, | |
714 | [FEXT_TO_IDX(FEXT_FCMPZ)] = { vfp_single_fcmpz, OP_SCALAR }, | |
715 | [FEXT_TO_IDX(FEXT_FCMPEZ)] = { vfp_single_fcmpez, OP_SCALAR }, | |
716 | [FEXT_TO_IDX(FEXT_FCVT)] = { vfp_single_fcvtd, OP_SCALAR|OP_DD }, | |
717 | [FEXT_TO_IDX(FEXT_FUITO)] = { vfp_single_fuito, OP_SCALAR }, | |
718 | [FEXT_TO_IDX(FEXT_FSITO)] = { vfp_single_fsito, OP_SCALAR }, | |
719 | [FEXT_TO_IDX(FEXT_FTOUI)] = { vfp_single_ftoui, OP_SCALAR }, | |
720 | [FEXT_TO_IDX(FEXT_FTOUIZ)] = { vfp_single_ftouiz, OP_SCALAR }, | |
721 | [FEXT_TO_IDX(FEXT_FTOSI)] = { vfp_single_ftosi, OP_SCALAR }, | |
722 | [FEXT_TO_IDX(FEXT_FTOSIZ)] = { vfp_single_ftosiz, OP_SCALAR }, | |
1da177e4 LT |
723 | }; |
724 | ||
725 | ||
726 | ||
727 | ||
728 | ||
729 | static u32 | |
730 | vfp_single_fadd_nonnumber(struct vfp_single *vsd, struct vfp_single *vsn, | |
731 | struct vfp_single *vsm, u32 fpscr) | |
732 | { | |
733 | struct vfp_single *vsp; | |
734 | u32 exceptions = 0; | |
735 | int tn, tm; | |
736 | ||
737 | tn = vfp_single_type(vsn); | |
738 | tm = vfp_single_type(vsm); | |
739 | ||
740 | if (tn & tm & VFP_INFINITY) { | |
741 | /* | |
742 | * Two infinities. Are they different signs? | |
743 | */ | |
744 | if (vsn->sign ^ vsm->sign) { | |
745 | /* | |
746 | * different signs -> invalid | |
747 | */ | |
748 | exceptions = FPSCR_IOC; | |
749 | vsp = &vfp_single_default_qnan; | |
750 | } else { | |
751 | /* | |
752 | * same signs -> valid | |
753 | */ | |
754 | vsp = vsn; | |
755 | } | |
756 | } else if (tn & VFP_INFINITY && tm & VFP_NUMBER) { | |
757 | /* | |
758 | * One infinity and one number -> infinity | |
759 | */ | |
760 | vsp = vsn; | |
761 | } else { | |
762 | /* | |
763 | * 'n' is a NaN of some type | |
764 | */ | |
765 | return vfp_propagate_nan(vsd, vsn, vsm, fpscr); | |
766 | } | |
767 | *vsd = *vsp; | |
768 | return exceptions; | |
769 | } | |
770 | ||
771 | static u32 | |
772 | vfp_single_add(struct vfp_single *vsd, struct vfp_single *vsn, | |
773 | struct vfp_single *vsm, u32 fpscr) | |
774 | { | |
775 | u32 exp_diff, m_sig; | |
776 | ||
777 | if (vsn->significand & 0x80000000 || | |
778 | vsm->significand & 0x80000000) { | |
779 | pr_info("VFP: bad FP values in %s\n", __func__); | |
780 | vfp_single_dump("VSN", vsn); | |
781 | vfp_single_dump("VSM", vsm); | |
782 | } | |
783 | ||
784 | /* | |
785 | * Ensure that 'n' is the largest magnitude number. Note that | |
786 | * if 'n' and 'm' have equal exponents, we do not swap them. | |
787 | * This ensures that NaN propagation works correctly. | |
788 | */ | |
789 | if (vsn->exponent < vsm->exponent) { | |
790 | struct vfp_single *t = vsn; | |
791 | vsn = vsm; | |
792 | vsm = t; | |
793 | } | |
794 | ||
795 | /* | |
796 | * Is 'n' an infinity or a NaN? Note that 'm' may be a number, | |
797 | * infinity or a NaN here. | |
798 | */ | |
799 | if (vsn->exponent == 255) | |
800 | return vfp_single_fadd_nonnumber(vsd, vsn, vsm, fpscr); | |
801 | ||
802 | /* | |
803 | * We have two proper numbers, where 'vsn' is the larger magnitude. | |
804 | * | |
805 | * Copy 'n' to 'd' before doing the arithmetic. | |
806 | */ | |
807 | *vsd = *vsn; | |
808 | ||
809 | /* | |
810 | * Align both numbers. | |
811 | */ | |
812 | exp_diff = vsn->exponent - vsm->exponent; | |
813 | m_sig = vfp_shiftright32jamming(vsm->significand, exp_diff); | |
814 | ||
815 | /* | |
816 | * If the signs are different, we are really subtracting. | |
817 | */ | |
818 | if (vsn->sign ^ vsm->sign) { | |
819 | m_sig = vsn->significand - m_sig; | |
820 | if ((s32)m_sig < 0) { | |
821 | vsd->sign = vfp_sign_negate(vsd->sign); | |
822 | m_sig = -m_sig; | |
823 | } else if (m_sig == 0) { | |
824 | vsd->sign = (fpscr & FPSCR_RMODE_MASK) == | |
825 | FPSCR_ROUND_MINUSINF ? 0x8000 : 0; | |
826 | } | |
827 | } else { | |
828 | m_sig = vsn->significand + m_sig; | |
829 | } | |
830 | vsd->significand = m_sig; | |
831 | ||
832 | return 0; | |
833 | } | |
834 | ||
835 | static u32 | |
836 | vfp_single_multiply(struct vfp_single *vsd, struct vfp_single *vsn, struct vfp_single *vsm, u32 fpscr) | |
837 | { | |
838 | vfp_single_dump("VSN", vsn); | |
839 | vfp_single_dump("VSM", vsm); | |
840 | ||
841 | /* | |
842 | * Ensure that 'n' is the largest magnitude number. Note that | |
843 | * if 'n' and 'm' have equal exponents, we do not swap them. | |
844 | * This ensures that NaN propagation works correctly. | |
845 | */ | |
846 | if (vsn->exponent < vsm->exponent) { | |
847 | struct vfp_single *t = vsn; | |
848 | vsn = vsm; | |
849 | vsm = t; | |
850 | pr_debug("VFP: swapping M <-> N\n"); | |
851 | } | |
852 | ||
853 | vsd->sign = vsn->sign ^ vsm->sign; | |
854 | ||
855 | /* | |
856 | * If 'n' is an infinity or NaN, handle it. 'm' may be anything. | |
857 | */ | |
858 | if (vsn->exponent == 255) { | |
859 | if (vsn->significand || (vsm->exponent == 255 && vsm->significand)) | |
860 | return vfp_propagate_nan(vsd, vsn, vsm, fpscr); | |
861 | if ((vsm->exponent | vsm->significand) == 0) { | |
862 | *vsd = vfp_single_default_qnan; | |
863 | return FPSCR_IOC; | |
864 | } | |
865 | vsd->exponent = vsn->exponent; | |
866 | vsd->significand = 0; | |
867 | return 0; | |
868 | } | |
869 | ||
870 | /* | |
871 | * If 'm' is zero, the result is always zero. In this case, | |
872 | * 'n' may be zero or a number, but it doesn't matter which. | |
873 | */ | |
874 | if ((vsm->exponent | vsm->significand) == 0) { | |
875 | vsd->exponent = 0; | |
876 | vsd->significand = 0; | |
877 | return 0; | |
878 | } | |
879 | ||
880 | /* | |
881 | * We add 2 to the destination exponent for the same reason as | |
882 | * the addition case - though this time we have +1 from each | |
883 | * input operand. | |
884 | */ | |
885 | vsd->exponent = vsn->exponent + vsm->exponent - 127 + 2; | |
886 | vsd->significand = vfp_hi64to32jamming((u64)vsn->significand * vsm->significand); | |
887 | ||
888 | vfp_single_dump("VSD", vsd); | |
889 | return 0; | |
890 | } | |
891 | ||
892 | #define NEG_MULTIPLY (1 << 0) | |
893 | #define NEG_SUBTRACT (1 << 1) | |
894 | ||
895 | static u32 | |
896 | vfp_single_multiply_accumulate(int sd, int sn, s32 m, u32 fpscr, u32 negate, char *func) | |
897 | { | |
898 | struct vfp_single vsd, vsp, vsn, vsm; | |
899 | u32 exceptions; | |
900 | s32 v; | |
901 | ||
902 | v = vfp_get_float(sn); | |
903 | pr_debug("VFP: s%u = %08x\n", sn, v); | |
904 | vfp_single_unpack(&vsn, v); | |
905 | if (vsn.exponent == 0 && vsn.significand) | |
906 | vfp_single_normalise_denormal(&vsn); | |
907 | ||
908 | vfp_single_unpack(&vsm, m); | |
909 | if (vsm.exponent == 0 && vsm.significand) | |
910 | vfp_single_normalise_denormal(&vsm); | |
911 | ||
912 | exceptions = vfp_single_multiply(&vsp, &vsn, &vsm, fpscr); | |
913 | if (negate & NEG_MULTIPLY) | |
914 | vsp.sign = vfp_sign_negate(vsp.sign); | |
915 | ||
916 | v = vfp_get_float(sd); | |
917 | pr_debug("VFP: s%u = %08x\n", sd, v); | |
918 | vfp_single_unpack(&vsn, v); | |
919 | if (negate & NEG_SUBTRACT) | |
920 | vsn.sign = vfp_sign_negate(vsn.sign); | |
921 | ||
922 | exceptions |= vfp_single_add(&vsd, &vsn, &vsp, fpscr); | |
923 | ||
924 | return vfp_single_normaliseround(sd, &vsd, fpscr, exceptions, func); | |
925 | } | |
926 | ||
927 | /* | |
928 | * Standard operations | |
929 | */ | |
930 | ||
931 | /* | |
932 | * sd = sd + (sn * sm) | |
933 | */ | |
934 | static u32 vfp_single_fmac(int sd, int sn, s32 m, u32 fpscr) | |
935 | { | |
936 | return vfp_single_multiply_accumulate(sd, sn, m, fpscr, 0, "fmac"); | |
937 | } | |
938 | ||
939 | /* | |
940 | * sd = sd - (sn * sm) | |
941 | */ | |
942 | static u32 vfp_single_fnmac(int sd, int sn, s32 m, u32 fpscr) | |
943 | { | |
944 | return vfp_single_multiply_accumulate(sd, sn, m, fpscr, NEG_MULTIPLY, "fnmac"); | |
945 | } | |
946 | ||
947 | /* | |
948 | * sd = -sd + (sn * sm) | |
949 | */ | |
950 | static u32 vfp_single_fmsc(int sd, int sn, s32 m, u32 fpscr) | |
951 | { | |
952 | return vfp_single_multiply_accumulate(sd, sn, m, fpscr, NEG_SUBTRACT, "fmsc"); | |
953 | } | |
954 | ||
955 | /* | |
956 | * sd = -sd - (sn * sm) | |
957 | */ | |
958 | static u32 vfp_single_fnmsc(int sd, int sn, s32 m, u32 fpscr) | |
959 | { | |
960 | return vfp_single_multiply_accumulate(sd, sn, m, fpscr, NEG_SUBTRACT | NEG_MULTIPLY, "fnmsc"); | |
961 | } | |
962 | ||
963 | /* | |
964 | * sd = sn * sm | |
965 | */ | |
966 | static u32 vfp_single_fmul(int sd, int sn, s32 m, u32 fpscr) | |
967 | { | |
968 | struct vfp_single vsd, vsn, vsm; | |
969 | u32 exceptions; | |
970 | s32 n = vfp_get_float(sn); | |
971 | ||
972 | pr_debug("VFP: s%u = %08x\n", sn, n); | |
973 | ||
974 | vfp_single_unpack(&vsn, n); | |
975 | if (vsn.exponent == 0 && vsn.significand) | |
976 | vfp_single_normalise_denormal(&vsn); | |
977 | ||
978 | vfp_single_unpack(&vsm, m); | |
979 | if (vsm.exponent == 0 && vsm.significand) | |
980 | vfp_single_normalise_denormal(&vsm); | |
981 | ||
982 | exceptions = vfp_single_multiply(&vsd, &vsn, &vsm, fpscr); | |
983 | return vfp_single_normaliseround(sd, &vsd, fpscr, exceptions, "fmul"); | |
984 | } | |
985 | ||
986 | /* | |
987 | * sd = -(sn * sm) | |
988 | */ | |
989 | static u32 vfp_single_fnmul(int sd, int sn, s32 m, u32 fpscr) | |
990 | { | |
991 | struct vfp_single vsd, vsn, vsm; | |
992 | u32 exceptions; | |
993 | s32 n = vfp_get_float(sn); | |
994 | ||
995 | pr_debug("VFP: s%u = %08x\n", sn, n); | |
996 | ||
997 | vfp_single_unpack(&vsn, n); | |
998 | if (vsn.exponent == 0 && vsn.significand) | |
999 | vfp_single_normalise_denormal(&vsn); | |
1000 | ||
1001 | vfp_single_unpack(&vsm, m); | |
1002 | if (vsm.exponent == 0 && vsm.significand) | |
1003 | vfp_single_normalise_denormal(&vsm); | |
1004 | ||
1005 | exceptions = vfp_single_multiply(&vsd, &vsn, &vsm, fpscr); | |
1006 | vsd.sign = vfp_sign_negate(vsd.sign); | |
1007 | return vfp_single_normaliseround(sd, &vsd, fpscr, exceptions, "fnmul"); | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * sd = sn + sm | |
1012 | */ | |
1013 | static u32 vfp_single_fadd(int sd, int sn, s32 m, u32 fpscr) | |
1014 | { | |
1015 | struct vfp_single vsd, vsn, vsm; | |
1016 | u32 exceptions; | |
1017 | s32 n = vfp_get_float(sn); | |
1018 | ||
1019 | pr_debug("VFP: s%u = %08x\n", sn, n); | |
1020 | ||
1021 | /* | |
1022 | * Unpack and normalise denormals. | |
1023 | */ | |
1024 | vfp_single_unpack(&vsn, n); | |
1025 | if (vsn.exponent == 0 && vsn.significand) | |
1026 | vfp_single_normalise_denormal(&vsn); | |
1027 | ||
1028 | vfp_single_unpack(&vsm, m); | |
1029 | if (vsm.exponent == 0 && vsm.significand) | |
1030 | vfp_single_normalise_denormal(&vsm); | |
1031 | ||
1032 | exceptions = vfp_single_add(&vsd, &vsn, &vsm, fpscr); | |
1033 | ||
1034 | return vfp_single_normaliseround(sd, &vsd, fpscr, exceptions, "fadd"); | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * sd = sn - sm | |
1039 | */ | |
1040 | static u32 vfp_single_fsub(int sd, int sn, s32 m, u32 fpscr) | |
1041 | { | |
1042 | /* | |
1043 | * Subtraction is addition with one sign inverted. | |
1044 | */ | |
1045 | return vfp_single_fadd(sd, sn, vfp_single_packed_negate(m), fpscr); | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * sd = sn / sm | |
1050 | */ | |
1051 | static u32 vfp_single_fdiv(int sd, int sn, s32 m, u32 fpscr) | |
1052 | { | |
1053 | struct vfp_single vsd, vsn, vsm; | |
1054 | u32 exceptions = 0; | |
1055 | s32 n = vfp_get_float(sn); | |
1056 | int tm, tn; | |
1057 | ||
1058 | pr_debug("VFP: s%u = %08x\n", sn, n); | |
1059 | ||
1060 | vfp_single_unpack(&vsn, n); | |
1061 | vfp_single_unpack(&vsm, m); | |
1062 | ||
1063 | vsd.sign = vsn.sign ^ vsm.sign; | |
1064 | ||
1065 | tn = vfp_single_type(&vsn); | |
1066 | tm = vfp_single_type(&vsm); | |
1067 | ||
1068 | /* | |
1069 | * Is n a NAN? | |
1070 | */ | |
1071 | if (tn & VFP_NAN) | |
1072 | goto vsn_nan; | |
1073 | ||
1074 | /* | |
1075 | * Is m a NAN? | |
1076 | */ | |
1077 | if (tm & VFP_NAN) | |
1078 | goto vsm_nan; | |
1079 | ||
1080 | /* | |
1081 | * If n and m are infinity, the result is invalid | |
1082 | * If n and m are zero, the result is invalid | |
1083 | */ | |
1084 | if (tm & tn & (VFP_INFINITY|VFP_ZERO)) | |
1085 | goto invalid; | |
1086 | ||
1087 | /* | |
1088 | * If n is infinity, the result is infinity | |
1089 | */ | |
1090 | if (tn & VFP_INFINITY) | |
1091 | goto infinity; | |
1092 | ||
1093 | /* | |
1094 | * If m is zero, raise div0 exception | |
1095 | */ | |
1096 | if (tm & VFP_ZERO) | |
1097 | goto divzero; | |
1098 | ||
1099 | /* | |
1100 | * If m is infinity, or n is zero, the result is zero | |
1101 | */ | |
1102 | if (tm & VFP_INFINITY || tn & VFP_ZERO) | |
1103 | goto zero; | |
1104 | ||
1105 | if (tn & VFP_DENORMAL) | |
1106 | vfp_single_normalise_denormal(&vsn); | |
1107 | if (tm & VFP_DENORMAL) | |
1108 | vfp_single_normalise_denormal(&vsm); | |
1109 | ||
1110 | /* | |
1111 | * Ok, we have two numbers, we can perform division. | |
1112 | */ | |
1113 | vsd.exponent = vsn.exponent - vsm.exponent + 127 - 1; | |
1114 | vsm.significand <<= 1; | |
1115 | if (vsm.significand <= (2 * vsn.significand)) { | |
1116 | vsn.significand >>= 1; | |
1117 | vsd.exponent++; | |
1118 | } | |
438a7616 RK |
1119 | { |
1120 | u64 significand = (u64)vsn.significand << 32; | |
1121 | do_div(significand, vsm.significand); | |
1122 | vsd.significand = significand; | |
1123 | } | |
1da177e4 LT |
1124 | if ((vsd.significand & 0x3f) == 0) |
1125 | vsd.significand |= ((u64)vsm.significand * vsd.significand != (u64)vsn.significand << 32); | |
1126 | ||
1127 | return vfp_single_normaliseround(sd, &vsd, fpscr, 0, "fdiv"); | |
1128 | ||
1129 | vsn_nan: | |
1130 | exceptions = vfp_propagate_nan(&vsd, &vsn, &vsm, fpscr); | |
1131 | pack: | |
0355b3e0 | 1132 | vfp_put_float(vfp_single_pack(&vsd), sd); |
1da177e4 LT |
1133 | return exceptions; |
1134 | ||
1135 | vsm_nan: | |
1136 | exceptions = vfp_propagate_nan(&vsd, &vsm, &vsn, fpscr); | |
1137 | goto pack; | |
1138 | ||
1139 | zero: | |
1140 | vsd.exponent = 0; | |
1141 | vsd.significand = 0; | |
1142 | goto pack; | |
1143 | ||
1144 | divzero: | |
1145 | exceptions = FPSCR_DZC; | |
1146 | infinity: | |
1147 | vsd.exponent = 255; | |
1148 | vsd.significand = 0; | |
1149 | goto pack; | |
1150 | ||
1151 | invalid: | |
0355b3e0 | 1152 | vfp_put_float(vfp_single_pack(&vfp_single_default_qnan), sd); |
1da177e4 LT |
1153 | return FPSCR_IOC; |
1154 | } | |
1155 | ||
4cc9bd2e | 1156 | static struct op fops[16] = { |
baf97ce6 RK |
1157 | [FOP_TO_IDX(FOP_FMAC)] = { vfp_single_fmac, 0 }, |
1158 | [FOP_TO_IDX(FOP_FNMAC)] = { vfp_single_fnmac, 0 }, | |
1159 | [FOP_TO_IDX(FOP_FMSC)] = { vfp_single_fmsc, 0 }, | |
1160 | [FOP_TO_IDX(FOP_FNMSC)] = { vfp_single_fnmsc, 0 }, | |
1161 | [FOP_TO_IDX(FOP_FMUL)] = { vfp_single_fmul, 0 }, | |
1162 | [FOP_TO_IDX(FOP_FNMUL)] = { vfp_single_fnmul, 0 }, | |
1163 | [FOP_TO_IDX(FOP_FADD)] = { vfp_single_fadd, 0 }, | |
1164 | [FOP_TO_IDX(FOP_FSUB)] = { vfp_single_fsub, 0 }, | |
1165 | [FOP_TO_IDX(FOP_FDIV)] = { vfp_single_fdiv, 0 }, | |
1da177e4 LT |
1166 | }; |
1167 | ||
1168 | #define FREG_BANK(x) ((x) & 0x18) | |
1169 | #define FREG_IDX(x) ((x) & 7) | |
1170 | ||
1171 | u32 vfp_single_cpdo(u32 inst, u32 fpscr) | |
1172 | { | |
1173 | u32 op = inst & FOP_MASK; | |
1174 | u32 exceptions = 0; | |
c29ecac1 | 1175 | unsigned int dest; |
1da177e4 LT |
1176 | unsigned int sn = vfp_get_sn(inst); |
1177 | unsigned int sm = vfp_get_sm(inst); | |
1178 | unsigned int vecitr, veclen, vecstride; | |
4cc9bd2e | 1179 | struct op *fop; |
1da177e4 | 1180 | |
1da177e4 LT |
1181 | vecstride = 1 + ((fpscr & FPSCR_STRIDE_MASK) == FPSCR_STRIDE_MASK); |
1182 | ||
4cc9bd2e | 1183 | fop = (op == FOP_EXT) ? &fops_ext[FEXT_TO_IDX(inst)] : &fops[FOP_TO_IDX(op)]; |
baf97ce6 | 1184 | |
c29ecac1 DJ |
1185 | /* |
1186 | * fcvtsd takes a dN register number as destination, not sN. | |
1187 | * Technically, if bit 0 of dd is set, this is an invalid | |
1188 | * instruction. However, we ignore this for efficiency. | |
1189 | * It also only operates on scalars. | |
1190 | */ | |
baf97ce6 | 1191 | if (fop->flags & OP_DD) |
c29ecac1 | 1192 | dest = vfp_get_dd(inst); |
baf97ce6 | 1193 | else |
c29ecac1 DJ |
1194 | dest = vfp_get_sd(inst); |
1195 | ||
1da177e4 LT |
1196 | /* |
1197 | * If destination bank is zero, vector length is always '1'. | |
1198 | * ARM DDI0100F C5.1.3, C5.3.2. | |
1199 | */ | |
baf97ce6 | 1200 | if ((fop->flags & OP_SCALAR) || FREG_BANK(dest) == 0) |
1da177e4 | 1201 | veclen = 0; |
4cc9bd2e GF |
1202 | else |
1203 | veclen = fpscr & FPSCR_LENGTH_MASK; | |
1da177e4 LT |
1204 | |
1205 | pr_debug("VFP: vecstride=%u veclen=%u\n", vecstride, | |
1206 | (veclen >> FPSCR_LENGTH_BIT) + 1); | |
1207 | ||
4cc9bd2e | 1208 | if (!fop->fn) |
1da177e4 LT |
1209 | goto invalid; |
1210 | ||
1211 | for (vecitr = 0; vecitr <= veclen; vecitr += 1 << FPSCR_LENGTH_BIT) { | |
1212 | s32 m = vfp_get_float(sm); | |
1213 | u32 except; | |
baf97ce6 | 1214 | char type; |
1da177e4 | 1215 | |
baf97ce6 RK |
1216 | type = fop->flags & OP_DD ? 'd' : 's'; |
1217 | if (op == FOP_EXT) | |
1218 | pr_debug("VFP: itr%d (%c%u) = op[%u] (s%u=%08x)\n", | |
1219 | vecitr >> FPSCR_LENGTH_BIT, type, dest, sn, | |
1220 | sm, m); | |
1da177e4 | 1221 | else |
baf97ce6 RK |
1222 | pr_debug("VFP: itr%d (%c%u) = (s%u) op[%u] (s%u=%08x)\n", |
1223 | vecitr >> FPSCR_LENGTH_BIT, type, dest, sn, | |
1da177e4 LT |
1224 | FOP_TO_IDX(op), sm, m); |
1225 | ||
4cc9bd2e | 1226 | except = fop->fn(dest, sn, m, fpscr); |
1da177e4 LT |
1227 | pr_debug("VFP: itr%d: exceptions=%08x\n", |
1228 | vecitr >> FPSCR_LENGTH_BIT, except); | |
1229 | ||
1230 | exceptions |= except; | |
1231 | ||
1da177e4 LT |
1232 | /* |
1233 | * CHECK: It appears to be undefined whether we stop when | |
1234 | * we encounter an exception. We continue. | |
1235 | */ | |
c29ecac1 | 1236 | dest = FREG_BANK(dest) + ((FREG_IDX(dest) + vecstride) & 7); |
1da177e4 LT |
1237 | sn = FREG_BANK(sn) + ((FREG_IDX(sn) + vecstride) & 7); |
1238 | if (FREG_BANK(sm) != 0) | |
1239 | sm = FREG_BANK(sm) + ((FREG_IDX(sm) + vecstride) & 7); | |
1240 | } | |
1241 | return exceptions; | |
1242 | ||
1243 | invalid: | |
1244 | return (u32)-1; | |
1245 | } |