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| /* SPDX-License-Identifier: GPL-2.0 */
| .global __sdivsi3
| .global __sdivsi3_1
| .global __sdivsi3_2
| .section .text..SHmedia32,"ax"
| .align 2
|
| /* inputs: r4,r5 */
| /* clobbered: r1,r18,r19,r20,r21,r25,tr0 */
| /* result in r0 */
| __sdivsi3:
| __sdivsi3_1:
| ptb __div_table,tr0
| gettr tr0,r20
|
| __sdivsi3_2:
| nsb r5, r1
| shlld r5, r1, r25 /* normalize; [-2 ..1, 1..2) in s2.62 */
| shari r25, 58, r21 /* extract 5(6) bit index (s2.4 with hole -1..1) */
| /* bubble */
| ldx.ub r20, r21, r19 /* u0.8 */
| shari r25, 32, r25 /* normalize to s2.30 */
| shlli r21, 1, r21
| muls.l r25, r19, r19 /* s2.38 */
| ldx.w r20, r21, r21 /* s2.14 */
| ptabs r18, tr0
| shari r19, 24, r19 /* truncate to s2.14 */
| sub r21, r19, r19 /* some 11 bit inverse in s1.14 */
| muls.l r19, r19, r21 /* u0.28 */
| sub r63, r1, r1
| addi r1, 92, r1
| muls.l r25, r21, r18 /* s2.58 */
| shlli r19, 45, r19 /* multiply by two and convert to s2.58 */
| /* bubble */
| sub r19, r18, r18
| shari r18, 28, r18 /* some 22 bit inverse in s1.30 */
| muls.l r18, r25, r0 /* s2.60 */
| muls.l r18, r4, r25 /* s32.30 */
| /* bubble */
| shari r0, 16, r19 /* s-16.44 */
| muls.l r19, r18, r19 /* s-16.74 */
| shari r25, 63, r0
| shari r4, 14, r18 /* s19.-14 */
| shari r19, 30, r19 /* s-16.44 */
| muls.l r19, r18, r19 /* s15.30 */
| xor r21, r0, r21 /* You could also use the constant 1 << 27. */
| add r21, r25, r21
| sub r21, r19, r21
| shard r21, r1, r21
| sub r21, r0, r0
| blink tr0, r63
|
| /* This table has been generated by divtab.c .
| Defects for bias -330:
| Max defect: 6.081536e-07 at -1.000000e+00
| Min defect: 2.849516e-08 at 1.030651e+00
| Max 2nd step defect: 9.606539e-12 at -1.000000e+00
| Min 2nd step defect: 0.000000e+00 at 0.000000e+00
| Defect at 1: 1.238659e-07
| Defect at -2: 1.061708e-07 */
|
| .balign 2
| .type __div_table,@object
| .size __div_table,128
| /* negative division constants */
| .word -16638
| .word -17135
| .word -17737
| .word -18433
| .word -19103
| .word -19751
| .word -20583
| .word -21383
| .word -22343
| .word -23353
| .word -24407
| .word -25582
| .word -26863
| .word -28382
| .word -29965
| .word -31800
| /* negative division factors */
| .byte 66
| .byte 70
| .byte 75
| .byte 81
| .byte 87
| .byte 93
| .byte 101
| .byte 109
| .byte 119
| .byte 130
| .byte 142
| .byte 156
| .byte 172
| .byte 192
| .byte 214
| .byte 241
| .skip 16
| .global __div_table
| __div_table:
| .skip 16
| /* positive division factors */
| .byte 241
| .byte 214
| .byte 192
| .byte 172
| .byte 156
| .byte 142
| .byte 130
| .byte 119
| .byte 109
| .byte 101
| .byte 93
| .byte 87
| .byte 81
| .byte 75
| .byte 70
| .byte 66
| /* positive division constants */
| .word 31801
| .word 29966
| .word 28383
| .word 26864
| .word 25583
| .word 24408
| .word 23354
| .word 22344
| .word 21384
| .word 20584
| .word 19752
| .word 19104
| .word 18434
| .word 17738
| .word 17136
| .word 16639
|
|
