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 28