compiler-rt/lib/builtins/subtf3.c

   1 //===-- lib/subtf3.c - Quad-precision subtraction -----------------*- 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 quad-precision soft-float subtraction.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #define QUAD_PRECISION
  14 #include "fp_lib.h"
  15
  16 #if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
  17 COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
  18
  19 // Subtraction; flip the sign bit of b and add.
  20 COMPILER_RT_ABI fp_t __subtf3(fp_t a, fp_t b) {
  21   return __addtf3(a, fromRep(toRep(b) ^ signBit));
  22 }
  23
  24 #endif