compiler-rt/lib/builtins/cmpdi2.c

   1 //===-- cmpdi2.c - Implement __cmpdi2 -------------------------------------===//
   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 // This file implements __cmpdi2 for the compiler_rt library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "int_lib.h"
  14
  15 // Returns: if (a <  b) returns 0
  16 //           if (a == b) returns 1
  17 //           if (a >  b) returns 2
  18
  19 COMPILER_RT_ABI si_int __cmpdi2(di_int a, di_int b) {
  20   dwords x;
  21   x.all = a;
  22   dwords y;
  23   y.all = b;
  24   if (x.s.high < y.s.high)
  25     return 0;
  26   if (x.s.high > y.s.high)
  27     return 2;
  28   if (x.s.low < y.s.low)
  29     return 0;
  30   if (x.s.low > y.s.low)
  31     return 2;
  32   return 1;
  33 }
  34
  35 #ifdef __ARM_EABI__
  36 // Returns: if (a <  b) returns -1
  37 //           if (a == b) returns  0
  38 //           if (a >  b) returns  1
  39 COMPILER_RT_ABI si_int __aeabi_lcmp(di_int a, di_int b) {
  40   return __cmpdi2(a, b) - 1;
  41 }
  42 #endif