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