lib/builtins/subtf3.c

   1 //===-- lib/subtf3.c - Quad-precision subtraction -----------------*- C -*-===//
   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 quad-precision soft-float subtraction with the
  11 // IEEE-754 default rounding (to nearest, ties to even).
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define QUAD_PRECISION
  16 #include "fp_lib.h"
  17
  18 #if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
  19 COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
  20
  21 // Subtraction; flip the sign bit of b and add.
  22 COMPILER_RT_ABI fp_t
  23 __subtf3(fp_t a, fp_t b) {
  24     return __addtf3(a, fromRep(toRep(b) ^ signBit));
  25 }
  26
  27 #endif