src/libcompiler_builtins/compiler-rt/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 // Subtraction; flip the sign bit of b and add.
  19 COMPILER_RT_ABI fp_t
  20 __subdf3(fp_t a, fp_t b) {
  21     return __adddf3(a, fromRep(toRep(b) ^ signBit));
  22 }
  23
  24 #if defined(__ARM_EABI__)
  25 #if defined(COMPILER_RT_ARMHF_TARGET)
  26 AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) {
  27   return __subdf3(a, b);
  28 }
  29 #else
  30 AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) COMPILER_RT_ALIAS(__subdf3);
  31 #endif
  32 #endif