text: //===-- lib/adddf3.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 double-precision soft-float subtraction with the
  // IEEE-754 default rounding (to nearest, ties to even).
  //
  //===----------------------------------------------------------------------===//
  
  #define DOUBLE_PRECISION
  #include "fp_lib.h"
  
  fp_t COMPILER_RT_ABI __adddf3(fp_t a, fp_t b);
  
  
  ARM_EABI_FNALIAS(dsub, subdf3)
  
  // Subtraction; flip the sign bit of b and add.
  COMPILER_RT_ABI fp_t
  __subdf3(fp_t a, fp_t b) {
      return __adddf3(a, fromRep(toRep(b) ^ signBit));
  }
  
  /* FIXME: rsub for ARM EABI */
  