1 /* $NetBSD: divsi3.S,v 1.4 2003/04/05 23:27:15 bjh21 Exp $ */
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17 #include <machine/asm.h>
18 __FBSDID("$FreeBSD$");
21 * stack is aligned as there's a possibility of branching to L_overflow
22 * which makes a C call
27 sub sp, sp, #4 /* align stack */
29 add sp, sp, #4 /* unalign stack */
36 sub sp, sp, #4 /* align stack */
38 add sp, sp, #4 /* unalign stack */
43 #if !defined(_KERNEL) && !defined(_STANDALONE)
44 mov r0, #8 /* SIGFPE */
45 bl PIC_SYM(_C_LABEL(raise), PLT) /* raise it */
48 /* XXX should cause a fatal error */
55 .L_udivide: /* r0 = r0 / r1; r1 = r0 % r1 */
59 /* r0 = r1 / r0; r1 = r1 % r0 */
66 orr ip, ip, #0x20000000 /* ip bit 0x20000000 = -ve r1 */
68 orrcs ip, ip, #0x10000000 /* ip bit 0x10000000 = bit 0 of r1 */
71 .L_divide_l0: /* r0 == 1 */
78 .L_divide: /* r0 = r0 / r1; r1 = r0 % r1 */
82 /* r0 = r1 / r0; r1 = r1 % r0 */
86 ands ip, r0, #0x80000000
88 ands r2, r1, #0x80000000
91 orr ip, r2, ip, lsr #1 /* ip bit 0x40000000 = -ve division */
92 /* ip bit 0x80000000 = -ve remainder */
99 * If the highest bit of the dividend is set, we have to be
100 * careful when shifting the divisor. Test this.
106 * At this point, the highest bit of r1 is known to be set.
107 * We abuse this below in the tst instructions.
109 tst r1, r0 /*, lsl #0 */
173 * tst r1, r0, lsl #31
243 subhs r1, r1,r0, lsl #31
244 addhs r3, r3,r2, lsl #31
247 subhs r1, r1,r0, lsl #30
248 addhs r3, r3,r2, lsl #30
251 subhs r1, r1,r0, lsl #29
252 addhs r3, r3,r2, lsl #29
255 subhs r1, r1,r0, lsl #28
256 addhs r3, r3,r2, lsl #28
259 subhs r1, r1,r0, lsl #27
260 addhs r3, r3,r2, lsl #27
263 subhs r1, r1,r0, lsl #26
264 addhs r3, r3,r2, lsl #26
267 subhs r1, r1,r0, lsl #25
268 addhs r3, r3,r2, lsl #25
271 subhs r1, r1,r0, lsl #24
272 addhs r3, r3,r2, lsl #24
275 subhs r1, r1,r0, lsl #23
276 addhs r3, r3,r2, lsl #23
279 subhs r1, r1,r0, lsl #22
280 addhs r3, r3,r2, lsl #22
283 subhs r1, r1,r0, lsl #21
284 addhs r3, r3,r2, lsl #21
287 subhs r1, r1,r0, lsl #20
288 addhs r3, r3,r2, lsl #20
291 subhs r1, r1,r0, lsl #19
292 addhs r3, r3,r2, lsl #19
295 subhs r1, r1,r0, lsl #18
296 addhs r3, r3,r2, lsl #18
299 subhs r1, r1,r0, lsl #17
300 addhs r3, r3,r2, lsl #17
303 subhs r1, r1,r0, lsl #16
304 addhs r3, r3,r2, lsl #16
307 subhs r1, r1,r0, lsl #15
308 addhs r3, r3,r2, lsl #15
311 subhs r1, r1,r0, lsl #14
312 addhs r3, r3,r2, lsl #14
315 subhs r1, r1,r0, lsl #13
316 addhs r3, r3,r2, lsl #13
319 subhs r1, r1,r0, lsl #12
320 addhs r3, r3,r2, lsl #12
323 subhs r1, r1,r0, lsl #11
324 addhs r3, r3,r2, lsl #11
327 subhs r1, r1,r0, lsl #10
328 addhs r3, r3,r2, lsl #10
331 subhs r1, r1,r0, lsl #9
332 addhs r3, r3,r2, lsl #9
335 subhs r1, r1,r0, lsl #8
336 addhs r3, r3,r2, lsl #8
339 subhs r1, r1,r0, lsl #7
340 addhs r3, r3,r2, lsl #7
343 subhs r1, r1,r0, lsl #6
344 addhs r3, r3,r2, lsl #6
347 subhs r1, r1,r0, lsl #5
348 addhs r3, r3,r2, lsl #5
351 subhs r1, r1,r0, lsl #4
352 addhs r3, r3,r2, lsl #4
355 subhs r1, r1,r0, lsl #3
356 addhs r3, r3,r2, lsl #3
359 subhs r1, r1,r0, lsl #2
360 addhs r3, r3,r2, lsl #2
363 subhs r1, r1,r0, lsl #1
364 addhs r3, r3,r2, lsl #1
377 bicmi r0, r0, #0x80000000 /* Fix incase we divided 0x80000000 */