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0ba22f51d1
Use the uniform single line C++/99 style for code comments. This is part of the cleanup proposed in "[RFC] compiler-rt builtins cleanup and refactoring". Differential Revision: https://reviews.llvm.org/D60352 llvm-svn: 359411
32 lines
972 B
C
32 lines
972 B
C
//===-- ffsti2.c - Implement __ffsti2 -------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements __ffsti2 for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "int_lib.h"
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#ifdef CRT_HAS_128BIT
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// Returns: the index of the least significant 1-bit in a, or
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// the value zero if a is zero. The least significant bit is index one.
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COMPILER_RT_ABI si_int __ffsti2(ti_int a) {
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twords x;
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x.all = a;
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if (x.s.low == 0) {
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if (x.s.high == 0)
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return 0;
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return __builtin_ctzll(x.s.high) + (1 + sizeof(di_int) * CHAR_BIT);
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}
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return __builtin_ctzll(x.s.low) + 1;
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}
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#endif // CRT_HAS_128BIT
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