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

   1 //===-- aeabi_uidivmod.S - EABI uidivmod implementation -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "../assembly.h"
  11
  12 // struct { unsigned quot, unsigned rem}
  13 //        __aeabi_uidivmod(unsigned numerator, unsigned denominator) {
  14 //   unsigned rem, quot;
  15 //   quot = __udivmodsi4(numerator, denominator, &rem);
  16 //   return {quot, rem};
  17 // }
  18
  19 #if defined(__MINGW32__)
  20 #define __aeabi_uidivmod __rt_udiv
  21 #endif
  22
  23         .syntax unified
  24         .text
  25         DEFINE_CODE_STATE
  26         .p2align 2
  27 DEFINE_COMPILERRT_FUNCTION(__aeabi_uidivmod)
  28 #if defined(USE_THUMB_1)
  29         cmp     r0, r1
  30         bcc     LOCAL_LABEL(case_denom_larger)
  31         push    {r0, r1, lr}
  32         bl      SYMBOL_NAME(__aeabi_uidiv)
  33         pop     {r1, r2, r3}
  34         muls    r2, r0, r2 // r2 = quot * denom
  35         subs    r1, r1, r2
  36         JMP     (r3)
  37 LOCAL_LABEL(case_denom_larger):
  38         movs    r1, r0
  39         movs    r0, #0
  40         JMP     (lr)
  41 #else // defined(USE_THUMB_1)
  42         push    { lr }
  43         sub     sp, sp, #4
  44         mov     r2, sp
  45 #if defined(__MINGW32__)
  46         mov     r3, r0
  47         mov     r0, r1
  48         mov     r1, r3
  49 #endif
  50         bl      SYMBOL_NAME(__udivmodsi4)
  51         ldr     r1, [sp]
  52         add     sp, sp, #4
  53         pop     { pc }
  54 #endif
  55 END_COMPILERRT_FUNCTION(__aeabi_uidivmod)
  56
  57 NO_EXEC_STACK_DIRECTIVE
  58