lib/cmpdi2.c

   1 /* ===-- cmpdi2.c - Implement __cmpdi2 -------------------------------------===
   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  * This file implements __cmpdi2 for the compiler_rt library.
  11  *
  12  * ===----------------------------------------------------------------------===
  13  */
  14
  15 #include "int_lib.h"
  16
  17 /* Returns: if (a <  b) returns 0
  18 *           if (a == b) returns 1
  19 *           if (a >  b) returns 2
  20 */
  21
  22 COMPILER_RT_ABI si_int
  23 __cmpdi2(di_int a, di_int b)
  24 {
  25     dwords x;
  26     x.all = a;
  27     dwords y;
  28     y.all = b;
  29     if (x.s.high < y.s.high)
  30         return 0;
  31     if (x.s.high > y.s.high)
  32         return 2;
  33     if (x.s.low < y.s.low)
  34         return 0;
  35     if (x.s.low > y.s.low)
  36         return 2;
  37     return 1;
  38 }
  39
  40 #ifdef __ARM_EABI__
  41 /* Returns: if (a <  b) returns -1
  42 *           if (a == b) returns  0
  43 *           if (a >  b) returns  1
  44 */
  45 COMPILER_RT_ABI si_int
  46 __aeabi_lcmp(di_int a, di_int b)
  47 {
  48         return __cmpdi2(a, b) - 1;
  49 }
  50 #endif
  51