subdf3.c revision 360660
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