negdf2.c

//===-- lib/negdf2.c - Double-precision subtraction ---------------*- C -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements single-precision soft-float subtraction with the
// IEEE-754 default rounding (to nearest, ties to even).
//
//===----------------------------------------------------------------------===//

#define DOUBLE_PRECISION
#include "fp_lib.h"

// Subtraction; flip the sign bit of b and add.
COMPILER_RT_ABI fp_t
__negdf2(fp_t a) {
  const rep_t ai = toRep(a) ^ signBit;
  return fromRep(ai);
}