search for: cntlz

Hi all, I couldn't find any documentation on this, but was wondering if people here knew what this inline asm means: unsigned __ctz_x = val; unsigned __ctz_c; __asm__ ("{cntlz|cntlzw} %0,%1" : "=r" (__ctz_c) : "r" (__ctz_x & -__ctz_x)); I'm assuming that "{cntlz|cntlzw}" indicates that one or the other of these asm mnemonics are used. But how does this get decided? Thanks! -bw

...used with input 0 */ #if defined(__INTEL_COMPILER) - return _bit_scan_reverse(n) ^ 31U; + return _bit_scan_reverse(v) ^ 31U; #elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) /* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on * -march= setting or to a software rutine in exotic machines. */ -- 1.7.10.4 --=_vA9B0g0mKp5QbmIrcmD4lw5 Content-Type: text/x-diff; charset=us-ascii; name=0002-bitwriter.c-Add-missing-extern-declaration.patch Content-Disposition: attachment; filename=0002-bitwriter.c-Add-...

...libFLAC\include\private\bitmath.h 2013-08-14 10:20:51.484053700 +0400 @@ -78,12 +78,12 @@ return _bit_scan_reverse(v) ^ 31U; #elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) /* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on - * -march= setting or to a software rutine in exotic machines. */ + * -march= setting or to a software routine in exotic machines. */ return __builtin_clz(v); #elif defined(_MSC_VER) && (_MSC_VER >= 1400) - FLAC__uint32 idx; + unsigned long idx; _...

El 03/05/12 12:19, Miroslav Lichvar escribi?: > Hi Josh, > > nice to see you here again. > > On Wed, Apr 25, 2012 at 04:26:05PM -0700, Josh Coalson wrote: >> (Jumping in again, maybe at the wrong point since this doesn't seem >> to involve encoding, but here goes.) >> >> Miroslav's patches have always been high-quality for sure. But >>

..._clz_uint32(FLAC__uint32 v) +{ +/* Never used with input 0 */ +#if defined(__INTEL_COMPILER) + return _bit_scan_reverse(n) ^ 31U; +#elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) +/* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on + * -march= setting or to a software rutine in exotic machines. */ + return __builtin_clz(v); +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) + FLAC__uint32 idx; + _BitScanReverse(&idx, v); + return idx ^ 31U; +#else + return FLAC__clz_soft_uint32(v)...

...used with input 0 */ #if defined(__INTEL_COMPILER) - return _bit_scan_reverse(n) ^ 31U; + return _bit_scan_reverse(v) ^ 31U; #elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)) /* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on * -march= setting or to a software rutine in exotic machines. */ -------------- next part -------------- diff -Naur flac-1.3.0pre4/src/libFLAC/stream_decoder.c flac-1.3.0pre4-patched/src/libFLAC/stream_decoder.c --- flac-1.3.0pre4/src/libFLAC/stream_decoder.c 2013-04-07 11:02:...