You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
969 B
32 lines
969 B
7 months ago
|
//===-- ffsti2.c - Implement __ffsti2 -------------------------------------===//
|
||
|
|
//
|
||
|
|
// 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 __ffsti2 for the compiler_rt library.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "int_lib.h"
|
||
|
|
|
||
|
|
#ifdef CRT_HAS_128BIT
|
||
|
|
|
||
|
|
// Returns: the index of the least significant 1-bit in a, or
|
||
|
|
// the value zero if a is zero. The least significant bit is index one.
|
||
|
|
|
||
|
|
COMPILER_RT_ABI int __ffsti2(ti_int a) {
|
||
|
|
twords x;
|
||
|
|
x.all = a;
|
||
|
|
if (x.s.low == 0) {
|
||
|
|
if (x.s.high == 0)
|
||
|
|
return 0;
|
||
|
|
return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
|
||
|
|
}
|
||
|
|
return __builtin_ctzll(x.s.low) + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // CRT_HAS_128BIT
|