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//===-- ffsdi2.c - Implement __ffsdi2 -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __ffsdi2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
// 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.
si_int
__ffsdi2(di_int a)
{
dwords x;
x.all = a;
if (x.low == 0)
{
if (x.high == 0)
return 0;
return __builtin_ctz(x.high) + (1 + sizeof(si_int) * CHAR_BIT);
}
return __builtin_ctz(x.low) + 1;
}
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