compiler-rt/lib/builtins/comparedf2.c

   1 //===-- lib/comparedf2.c - Double-precision comparisons -----------*- C -*-===//
   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 the following soft-float comparison routines:
  10 //
  11 //   __eqdf2   __gedf2   __unorddf2
  12 //   __ledf2   __gtdf2
  13 //   __ltdf2
  14 //   __nedf2
  15 //
  16 // The semantics of the routines grouped in each column are identical, so there
  17 // is a single implementation for each, and wrappers to provide the other names.
  18 //
  19 // The main routines behave as follows:
  20 //
  21 //   __ledf2(a,b) returns -1 if a < b
  22 //                         0 if a == b
  23 //                         1 if a > b
  24 //                         1 if either a or b is NaN
  25 //
  26 //   __gedf2(a,b) returns -1 if a < b
  27 //                         0 if a == b
  28 //                         1 if a > b
  29 //                        -1 if either a or b is NaN
  30 //
  31 //   __unorddf2(a,b) returns 0 if both a and b are numbers
  32 //                           1 if either a or b is NaN
  33 //
  34 // Note that __ledf2( ) and __gedf2( ) are identical except in their handling of
  35 // NaN values.
  36 //
  37 //===----------------------------------------------------------------------===//
  38
  39 #define DOUBLE_PRECISION
  40 #include "fp_lib.h"
  41
  42 #include "fp_compare_impl.inc"
  43
  44 COMPILER_RT_ABI CMP_RESULT __ledf2(fp_t a, fp_t b) { return __leXf2__(a, b); }
  45
  46 #if defined(__ELF__)
  47 // Alias for libgcc compatibility
  48 COMPILER_RT_ALIAS(__ledf2, __cmpdf2)
  49 #endif
  50 COMPILER_RT_ALIAS(__ledf2, __eqdf2)
  51 COMPILER_RT_ALIAS(__ledf2, __ltdf2)
  52 COMPILER_RT_ALIAS(__ledf2, __nedf2)
  53
  54 COMPILER_RT_ABI CMP_RESULT __gedf2(fp_t a, fp_t b) { return __geXf2__(a, b); }
  55
  56 COMPILER_RT_ALIAS(__gedf2, __gtdf2)
  57
  58 COMPILER_RT_ABI CMP_RESULT __unorddf2(fp_t a, fp_t b) {
  59   return __unordXf2__(a, b);
  60 }
  61
  62 #if defined(__ARM_EABI__)
  63 #if defined(COMPILER_RT_ARMHF_TARGET)
  64 AEABI_RTABI int __aeabi_dcmpun(fp_t a, fp_t b) { return __unorddf2(a, b); }
  65 #else
  66 COMPILER_RT_ALIAS(__unorddf2, __aeabi_dcmpun)
  67 #endif
  68 #endif
  69
  70 #if defined(_WIN32) && !defined(__MINGW32__)
  71 // The alias mechanism doesn't work on Windows except for MinGW, so emit
  72 // wrapper functions.
  73 int __eqdf2(fp_t a, fp_t b) { return __ledf2(a, b); }
  74 int __ltdf2(fp_t a, fp_t b) { return __ledf2(a, b); }
  75 int __nedf2(fp_t a, fp_t b) { return __ledf2(a, b); }
  76 int __gtdf2(fp_t a, fp_t b) { return __gedf2(a, b); }
  77 #endif