1 //===-- lib/adddf3.c - Double-precision subtraction ---------------*- C -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements double-precision soft-float subtraction with the 11 // IEEE-754 default rounding (to nearest, ties to even). 12 // 13 //===----------------------------------------------------------------------===// 14 15 #define DOUBLE_PRECISION 16 #include "fp_lib.h" 17 18 ARM_EABI_FNALIAS(dsub, subdf3) 19 20 // Subtraction; flip the sign bit of b and add. 21 COMPILER_RT_ABI fp_t 22 __subdf3(fp_t a, fp_t b) { 23 return __adddf3(a, fromRep(toRep(b) ^ signBit)); 24 } 25 26 /* FIXME: rsub for ARM EABI */ 27
