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 
ARM_EABI_FNALIAS(dsub,subdf3)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