subdf3.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
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
18ARM_EABI_FNALIAS(dsub, subdf3)
19
20// Subtraction; flip the sign bit of b and add.
21COMPILER_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