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Avoid redefinition of _bit_scan_{forward,reverse} macros #248

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Dec 4, 2020
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Avoid redefinition of _bit_scan_{forward,reverse} macros #248

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7 changes: 2 additions & 5 deletions Vc/common/bitscanintrinsics.h
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Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define VC_COMMON_BITSCANINTRINSICS_H_

#if defined(Vc_GCC) || defined(Vc_CLANG) || defined(Vc_APPLECLANG)
# if Vc_GCC >= 0x40500
// GCC 4.5.0 introduced _bit_scan_forward / _bit_scan_reverse
# include <x86intrin.h>
# else
// GCC <= 4.4 and clang have x86intrin.h, but not the required functions
#include <x86intrin.h>
# ifndef _bit_scan_forward
# define _bit_scan_forward(x) __builtin_ctz(x)
#include "macros.h"
static Vc_ALWAYS_INLINE Vc_CONST int _Vc_bit_scan_reverse_asm(unsigned int x) {
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