forked from OSchip/llvm-project
30 lines
884 B
C
30 lines
884 B
C
//===-- clzti2.c - Implement __clzti2 -------------------------------------===//
|
|
//
|
|
// 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 __clzti2 for the compiler_rt library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "int_lib.h"
|
|
|
|
#ifdef CRT_HAS_128BIT
|
|
|
|
// Returns: the number of leading 0-bits
|
|
|
|
// Precondition: a != 0
|
|
|
|
COMPILER_RT_ABI int __clzti2(ti_int a) {
|
|
twords x;
|
|
x.all = a;
|
|
const di_int f = -(x.s.high == 0);
|
|
return __builtin_clzll((x.s.high & ~f) | (x.s.low & f)) +
|
|
((si_int)f & ((si_int)(sizeof(di_int) * CHAR_BIT)));
|
|
}
|
|
|
|
#endif // CRT_HAS_128BIT
|