llvm-project/compiler-rt/lib/builtins/subtf3.c

//===-- lib/subtf3.c - Quad-precision subtraction -----------------*- C -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements quad-precision soft-float subtraction with the
// IEEE-754 default rounding (to nearest, ties to even).
//
//===----------------------------------------------------------------------===//

#define QUAD_PRECISION
#include "fp_lib.h"

#if defined(CRT_HAS_128BIT) && defined(CRT_LDBL_128BIT)
COMPILER_RT_ABI fp_t __addtf3(fp_t a, fp_t b);

// Subtraction; flip the sign bit of b and add.
COMPILER_RT_ABI fp_t
__subtf3(fp_t a, fp_t b) {
    return __addtf3(a, fromRep(toRep(b) ^ signBit));
}

#endif