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 */
35 sub sp, sp, #4 /* align stack */
37 add sp, sp, #4 /* unalign stack */
42 #if !defined(_KERNEL) && !defined(_STANDALONE)
43 mov r0, #8 /* SIGFPE */
44 bl PIC_SYM(_C_LABEL(raise), PLT) /* raise it */
47 /* XXX should cause a fatal error */
53 .L_udivide: /* r0 = r0 / r1; r1 = r0 % r1 */
57 /* r0 = r1 / r0; r1 = r1 % r0 */
64 orr ip, ip, #0x20000000 /* ip bit 0x20000000 = -ve r1 */
66 orrcs ip, ip, #0x10000000 /* ip bit 0x10000000 = bit 0 of r1 */
69 .L_divide_l0: /* r0 == 1 */
75 .L_divide: /* r0 = r0 / r1; r1 = r0 % r1 */
79 /* r0 = r1 / r0; r1 = r1 % r0 */
83 ands ip, r0, #0x80000000
85 ands r2, r1, #0x80000000
88 orr ip, r2, ip, lsr #1 /* ip bit 0x40000000 = -ve division */
89 /* ip bit 0x80000000 = -ve remainder */
96 * If the highest bit of the dividend is set, we have to be
97 * careful when shifting the divisor. Test this.
103 * At this point, the highest bit of r1 is known to be set.
104 * We abuse this below in the tst instructions.
106 tst r1, r0 /*, lsl #0 */
170 * tst r1, r0, lsl #31
240 subhs r1, r1,r0, lsl #31
241 addhs r3, r3,r2, lsl #31
244 subhs r1, r1,r0, lsl #30
245 addhs r3, r3,r2, lsl #30
248 subhs r1, r1,r0, lsl #29
249 addhs r3, r3,r2, lsl #29
252 subhs r1, r1,r0, lsl #28
253 addhs r3, r3,r2, lsl #28
256 subhs r1, r1,r0, lsl #27
257 addhs r3, r3,r2, lsl #27
260 subhs r1, r1,r0, lsl #26
261 addhs r3, r3,r2, lsl #26
264 subhs r1, r1,r0, lsl #25
265 addhs r3, r3,r2, lsl #25
268 subhs r1, r1,r0, lsl #24
269 addhs r3, r3,r2, lsl #24
272 subhs r1, r1,r0, lsl #23
273 addhs r3, r3,r2, lsl #23
276 subhs r1, r1,r0, lsl #22
277 addhs r3, r3,r2, lsl #22
280 subhs r1, r1,r0, lsl #21
281 addhs r3, r3,r2, lsl #21
284 subhs r1, r1,r0, lsl #20
285 addhs r3, r3,r2, lsl #20
288 subhs r1, r1,r0, lsl #19
289 addhs r3, r3,r2, lsl #19
292 subhs r1, r1,r0, lsl #18
293 addhs r3, r3,r2, lsl #18
296 subhs r1, r1,r0, lsl #17
297 addhs r3, r3,r2, lsl #17
300 subhs r1, r1,r0, lsl #16
301 addhs r3, r3,r2, lsl #16
304 subhs r1, r1,r0, lsl #15
305 addhs r3, r3,r2, lsl #15
308 subhs r1, r1,r0, lsl #14
309 addhs r3, r3,r2, lsl #14
312 subhs r1, r1,r0, lsl #13
313 addhs r3, r3,r2, lsl #13
316 subhs r1, r1,r0, lsl #12
317 addhs r3, r3,r2, lsl #12
320 subhs r1, r1,r0, lsl #11
321 addhs r3, r3,r2, lsl #11
324 subhs r1, r1,r0, lsl #10
325 addhs r3, r3,r2, lsl #10
328 subhs r1, r1,r0, lsl #9
329 addhs r3, r3,r2, lsl #9
332 subhs r1, r1,r0, lsl #8
333 addhs r3, r3,r2, lsl #8
336 subhs r1, r1,r0, lsl #7
337 addhs r3, r3,r2, lsl #7
340 subhs r1, r1,r0, lsl #6
341 addhs r3, r3,r2, lsl #6
344 subhs r1, r1,r0, lsl #5
345 addhs r3, r3,r2, lsl #5
348 subhs r1, r1,r0, lsl #4
349 addhs r3, r3,r2, lsl #4
352 subhs r1, r1,r0, lsl #3
353 addhs r3, r3,r2, lsl #3
356 subhs r1, r1,r0, lsl #2
357 addhs r3, r3,r2, lsl #2
360 subhs r1, r1,r0, lsl #1
361 addhs r3, r3,r2, lsl #1
374 bicmi r0, r0, #0x80000000 /* Fix incase we divided 0x80000000 */