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. 18 COMPILER_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) 24 AEABI_RTABI fp_t __aeabi_dsub(fp_t a, fp_t b) { return __subdf3(a, b); } 25 #else 26 COMPILER_RT_ALIAS(__subdf3, __aeabi_dsub) 27 #endif 28 #endif 29