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)
19 COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);
20 
21 // Subtraction; flip the sign bit of b and add.
22 COMPILER_RT_ABI fp_t
__subtf3(fp_t a,fp_t b)23 __subtf3(fp_t a, fp_t b) {
24     return __addtf3(a, fromRep(toRep(b) ^ signBit));
25 }
26 
27 #endif
28