compiler-rt/lib/builtins/arm/aeabi_uidivmod.S

   1 //===-- aeabi_uidivmod.S - EABI uidivmod 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 { unsigned quot, unsigned rem}
  12 //        __aeabi_uidivmod(unsigned numerator, unsigned denominator) {
  13 //   unsigned rem, quot;
  14 //   quot = __udivmodsi4(numerator, denominator, &rem);
  15 //   return {quot, rem};
  16 // }
  17
  18 #if defined(__MINGW32__)
  19 #define __aeabi_uidivmod __rt_udiv
  20 #endif
  21
  22         .syntax unified
  23         .text
  24         DEFINE_CODE_STATE
  25         .p2align 2
  26 DEFINE_COMPILERRT_FUNCTION(__aeabi_uidivmod)
  27 #if defined(USE_THUMB_1)
  28         cmp     r0, r1
  29         bcc     LOCAL_LABEL(case_denom_larger)
  30         push    {r0, r1, lr}
  31         bl      SYMBOL_NAME(__aeabi_uidiv)
  32         pop     {r1, r2, r3}
  33         muls    r2, r0, r2 // r2 = quot * denom
  34         subs    r1, r1, r2
  35         JMP     (r3)
  36 LOCAL_LABEL(case_denom_larger):
  37         movs    r1, r0
  38         movs    r0, #0
  39         JMP     (lr)
  40 #else // defined(USE_THUMB_1)
  41         push    { lr }
  42         sub     sp, sp, #4
  43         mov     r2, sp
  44 #if defined(__MINGW32__)
  45         mov     r3, r0
  46         mov     r0, r1
  47         mov     r1, r3
  48 #endif
  49         bl      SYMBOL_NAME(__udivmodsi4)
  50         ldr     r1, [sp]
  51         add     sp, sp, #4
  52         pop     { pc }
  53 #endif
  54 END_COMPILERRT_FUNCTION(__aeabi_uidivmod)
  55
  56 NO_EXEC_STACK_DIRECTIVE
  57