I'm on Win-XP (32bit, MSVC v16) and get a link error on a
missing '__BitScanReverse64()' in test-count-leading-zeros.c:.
Here is the dis-asm:
_count_leading_zeros_ll:
push ebp
mov ebp,esp
sub esp,0x00000008
X$72:
mov eax,dword ptr 0xc[ebp]
push eax
mov ecx,dword ptr 0x8[ebp]
push ecx
lea edx,-0x4[ebp]
push edx
call j^__BitScanReverse64
According to MSVC's <intrin.h>, the intrinsic for this function only
exists on 64-bit machines:
/*__MACHINEW64 : WIN64(tm), 64 bit compilers only */
__MACHINEW64(unsigned char _BitScanForward64(unsigned long* Index,
unsigned __int64 Mask))
--
--gv
