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util: only allow _BitScanReverse64 on 64-bit cpus

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While the documentation for _BitScanReverse64 on MSDN says that it's
available on ARM, this isn't true. It's only available on ARM64. So
let's match reality.

Signed-off-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Erik Faye-Lund
2019-08-14 22:29:24 +02:00
parent 1de9ba33a2
commit 2f82d972ab
2 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/util/bitscan.c
+1 -1
View File
@@ -60,7 +60,7 @@ ffs(int i)
#endif
#ifdef HAVE___BUILTIN_FFSLL
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM || _M_IA64)
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM64 || _M_IA64)
#else
int
ffsll(long long int val)
src/util/bitscan.h
+2 -2
View File
@@ -72,7 +72,7 @@ int ffs(int i);
#ifdef HAVE___BUILTIN_FFSLL
#define ffsll __builtin_ffsll
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM || _M_IA64)
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM64 || _M_IA64)
static inline int
ffsll(long long int i)
{
@@ -235,7 +235,7 @@ util_last_bit64(uint64_t u)
{
#if defined(HAVE___BUILTIN_CLZLL)
return u == 0 ? 0 : 64 - __builtin_clzll(u);
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM || _M_IA64)
#elif defined(_MSC_VER) && (_M_AMD64 || _M_ARM64 || _M_IA64)
unsigned long index;
if (_BitScanReverse64(&index, u))
return index + 1;