compiler-rt/lib/builtins/subdf3.c

   1 //===-- lib/adddf3.c - Double-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 double-precision soft-float subtraction.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #define DOUBLE_PRECISION
  14 #include "fp_lib.h"
  15
  16 // Subtraction; flip the sign bit of b and add.
  17 COMPILER_RT_ABI fp_t __subdf3(fp_t a, fp_t b) {
  18   return __adddf3(a, fromRep(toRep(b) ^ signBit));
  19 }
  20
  21 #if defined(__ARM_EABI__)
  22 #if defined(COMPILER_RT_ARMHF_TARGET)
  23 AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) { return __subdf3(a, b); }
  24 #else
  25 COMPILER_RT_ALIAS(__subdf3, __aeabi_dsub)
  26 #endif
  27 #endif