lib/builtins/subdf3.c

   1 //===-- lib/adddf3.c - Double-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 double-precision soft-float subtraction with the
  11 // IEEE-754 default rounding (to nearest, ties to even).
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #define DOUBLE_PRECISION
  16 #include "fp_lib.h"
  17
  18 ARM_EABI_FNALIAS(dsub, subdf3)
  19
  20 // Subtraction; flip the sign bit of b and add.
  21 COMPILER_RT_ABI fp_t
  22 __subdf3(fp_t a, fp_t b) {
  23     return __adddf3(a, fromRep(toRep(b) ^ signBit));
  24 }
  25
  26 /* FIXME: rsub for ARM EABI */