| /* # 1 "libgcc1.S" */ |

| @ libgcc1 routines for ARM cpu. |

| @ Division routines, written by Richard Earnshaw, (rearnsha@armltd.co.uk) |

| dividend .req r0 |

| divisor .req r1 |

| result .req r2 |

| curbit .req r3 |

| /* ip .req r12 */ |

| /* sp .req r13 */ |

| /* lr .req r14 */ |

| /* pc .req r15 */ |

| .text |

| .globl __udivsi3 |

| .type __udivsi3 ,function |

| .align 0 |

| __udivsi3 : |

| cmp divisor, #0 |

| beq Ldiv0 |

| mov curbit, #1 |

| mov result, #0 |

| cmp dividend, divisor |

| bcc Lgot_result |

| Loop1: |

| @ Unless the divisor is very big, shift it up in multiples of |

| @ four bits, since this is the amount of unwinding in the main |

| @ division loop. Continue shifting until the divisor is |

| @ larger than the dividend. |

| cmp divisor, #0x10000000 |

| cmpcc divisor, dividend |

| movcc divisor, divisor, lsl #4 |

| movcc curbit, curbit, lsl #4 |

| bcc Loop1 |

| Lbignum: |

| @ For very big divisors, we must shift it a bit at a time, or |

| @ we will be in danger of overflowing. |

| cmp divisor, #0x80000000 |

| cmpcc divisor, dividend |

| movcc divisor, divisor, lsl #1 |

| movcc curbit, curbit, lsl #1 |

| bcc Lbignum |

| Loop3: |

| @ Test for possible subtractions, and note which bits |

| @ are done in the result. On the final pass, this may subtract |

| @ too much from the dividend, but the result will be ok, since the |

| @ "bit" will have been shifted out at the bottom. |

| cmp dividend, divisor |

| subcs dividend, dividend, divisor |

| orrcs result, result, curbit |

| cmp dividend, divisor, lsr #1 |

| subcs dividend, dividend, divisor, lsr #1 |

| orrcs result, result, curbit, lsr #1 |

| cmp dividend, divisor, lsr #2 |

| subcs dividend, dividend, divisor, lsr #2 |

| orrcs result, result, curbit, lsr #2 |

| cmp dividend, divisor, lsr #3 |

| subcs dividend, dividend, divisor, lsr #3 |

| orrcs result, result, curbit, lsr #3 |

| cmp dividend, #0 @ Early termination? |

| movnes curbit, curbit, lsr #4 @ No, any more bits to do? |

| movne divisor, divisor, lsr #4 |

| bne Loop3 |

| Lgot_result: |

| mov r0, result |

| mov pc, lr |

| Ldiv0: |

| str lr, [sp, #-4]! |

| bl __div0 (PLT) |

| mov r0, #0 @ about as wrong as it could be |

| ldmia sp!, {pc} |

| .size __udivsi3 , . - __udivsi3 |

| /* # 235 "libgcc1.S" */ |

| /* # 320 "libgcc1.S" */ |

| /* # 421 "libgcc1.S" */ |

| /* # 433 "libgcc1.S" */ |

| /* # 456 "libgcc1.S" */ |

| /* # 500 "libgcc1.S" */ |

| /* # 580 "libgcc1.S" */ |