1//===-- aeabi_idivmod.S - EABI idivmod implementation ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "../assembly.h"
10
11// struct { int quot, int rem} __aeabi_idivmod(int numerator, int denominator) {
12// int rem, quot;
13// quot = __divmodsi4(numerator, denominator, &rem);
14// return {quot, rem};
15// }
16
17#if defined(__MINGW32__)
18#define __aeabi_idivmod __rt_sdiv
19#endif
20
21 .syntax unified
22 .text
23 DEFINE_CODE_STATE
24 .p2align 2
25DEFINE_COMPILERRT_FUNCTION(__aeabi_idivmod)
26#if defined(USE_THUMB_1)
27 push {r0, r1, lr}
28 bl SYMBOL_NAME(__divsi3)
29 pop {r1, r2, r3} // now r0 = quot, r1 = num, r2 = denom
30 muls r2, r0, r2 // r2 = quot * denom
31 subs r1, r1, r2
32 JMP (r3)
33#else // defined(USE_THUMB_1)
34 push { lr }
35 sub sp, sp, #4
36 mov r2, sp
37#if defined(__MINGW32__)
38 mov r3, r0
39 mov r0, r1
40 mov r1, r3
41#endif
42 bl SYMBOL_NAME(__divmodsi4)
43 ldr r1, [sp]
44 add sp, sp, #4
45 pop { pc }
46#endif // defined(USE_THUMB_1)
47END_COMPILERRT_FUNCTION(__aeabi_idivmod)
48
49NO_EXEC_STACK_DIRECTIVE
50
51

source code of compiler-rt/lib/builtins/arm/aeabi_idivmod.S