subtf3.c revision 5a869d4603ce41572b6f2f9b5b2f305a16596e63 
1//===-- lib/subtf3.c - Quad-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 quad-precision soft-float subtraction with the
11// IEEE-754 default rounding (to nearest, ties to even).
12//
13//===----------------------------------------------------------------------===//
14
15#define QUAD_PRECISION
16#include "fp_lib.h"
17
18#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
19COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
20
21// Subtraction; flip the sign bit of b and add.
22COMPILER_RT_ABI fp_t
23__subtf3(fp_t a, fp_t b) {
24    return __addtf3(a, fromRep(toRep(b) ^ signBit));
25}
26
27#endif
28