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/* { dg-do run } */
/* { dg-require-effective-target clzll } */
/* { dg-options "-O2 -fno-tree-ch -fdump-tree-optimized" } */
#define PREC (__CHAR_BIT__ * __SIZEOF_LONG_LONG__)
int
__attribute__ ((noinline, noclone))
foo (unsigned long long b) {
int c = 0;
if (b == 0)
return PREC;
while (!(b & (1LL << (PREC - 1)))) {
b <<= 1;
c++;
}
return c;
}
int main()
{
if (foo(0) != PREC)
__builtin_abort ();
if (foo(1LL << (PREC - 1)) != 0)
__builtin_abort ();
if (foo(35) != PREC - 6)
__builtin_abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "__builtin_clz|\\.CLZ" 1 "optimized" } } */
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