subdf3.c revision 222625 
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#include "abi.h"
15
16#define DOUBLE_PRECISION
17#include "fp_lib.h"
18
19fp_t COMPILER_RT_ABI __adddf3(fp_t a, fp_t b);
20
21
22ARM_EABI_FNALIAS(dsub, subdf3);
23
24// Subtraction; flip the sign bit of b and add.
25COMPILER_RT_ABI fp_t
26__subdf3(fp_t a, fp_t b) {
27    return __adddf3(a, fromRep(toRep(b) ^ signBit));
28}
29
30/* FIXME: rsub for ARM EABI */
31