fls64
len = fls64((n << 6) + (~imms & 0x3f)) - 1;
len = fls64((n << 6) + (~imms & 0x3f)) - 1;
len = fls64((n << 6) + (~imms & 0x3f)) - 1;
res = fls64(val);
#ifndef fls64
((sizeof(_n) > 4 ? fls64(_n) : fls32(_n)) - 1) \
ATF_CHECK_EQ_MSG((n = fls64(0)), 0x00, "n=%d", n);
ATF_CHECK_EQ_MSG((n = fls64(UINT64_MAX)), 0x40, "n=%d", n);
ATF_CHECK_EQ_MSG((n = fls64(bits[i].val)), (m = bits[i].fls),
ATF_CHECK_EQ_MSG((n = fls64(bits[i].val << 1)),
ATF_CHECK_EQ_MSG((n = fls64(bits[i].val << 9)),