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Daniel Dunbar0868ca62011-03-21 23:30:19 +00001//===-- 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
Anton Korobeynikov1c5f89b2011-04-19 17:52:09 +000018fp_t COMPILER_RT_ABI __adddf3(fp_t a, fp_t b);
Daniel Dunbar0868ca62011-03-21 23:30:19 +000019
Anton Korobeynikov37b97d12011-04-19 17:51:24 +000020
Chandler Carruth0193b742012-06-22 21:09:15 +000021ARM_EABI_FNALIAS(dsub, subdf3)
Anton Korobeynikov37b97d12011-04-19 17:51:24 +000022
Daniel Dunbar0868ca62011-03-21 23:30:19 +000023// Subtraction; flip the sign bit of b and add.
Anton Korobeynikov1c5f89b2011-04-19 17:52:09 +000024COMPILER_RT_ABI fp_t
25__subdf3(fp_t a, fp_t b) {
Daniel Dunbar0868ca62011-03-21 23:30:19 +000026 return __adddf3(a, fromRep(toRep(b) ^ signBit));
27}
Anton Korobeynikov37b97d12011-04-19 17:51:24 +000028
29/* FIXME: rsub for ARM EABI */