subdf3.c revision 353358 
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 with the
10// IEEE-754 default rounding (to nearest, ties to even).
11//
12//===----------------------------------------------------------------------===//
13
14#define DOUBLE_PRECISION
15#include "fp_lib.h"
16
17// Subtraction; flip the sign bit of b and add.
18COMPILER_RT_ABI fp_t __subdf3(fp_t a, fp_t b) {
19  return __adddf3(a, fromRep(toRep(b) ^ signBit));
20}
21
22#if defined(__ARM_EABI__)
23#if defined(COMPILER_RT_ARMHF_TARGET)
24AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) { return __subdf3(a, b); }
25#else
26COMPILER_RT_ALIAS(__subdf3, __aeabi_dsub)
27#endif
28#endif
29