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Don't use _pext_u64() directly

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This intrinsic to call BMI2 PEXT instruction is
defined in immintrin.h. This header should be
included only when USE_PEXT is defined, otherwise
we define _pext_u64 as 0 forcing a nop.

But under some mingw platforms, even if we don't
include the header, immintrin.h gets included
anyhow through an include chain that starts with
STL <algorithm> header. So we end up both defining
_pext_u64 function and at the same time defining
_pext_u64 as 0 leading to a compile error.

The correct solution is of not using _pext_u64 directly.

This patch fixes a compile error with some mingw64
package when compiling with x86-64.

No functional change.
This commit is contained in:
Marco Costalba 2015-01-20 22:17:22 +01:00
parent ca3622f8e8
commit f54c44e6be
3 changed files with 4 additions and 3 deletions
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2
src/bitboard.cpp
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@ -275,7 +275,7 @@ namespace {
reference[size] = sliding_attack(deltas, s, b);
if (HasPext)
attacks[s][_pext_u64(b, masks[s])] = reference[size];
attacks[s][pext(b, masks[s])] = reference[size];
size++;
b = (b - masks[s]) & masks[s];

2
src/bitboard.h
View file

@ -238,7 +238,7 @@ FORCE_INLINE unsigned magic_index(Square s, Bitboard occupied) {
unsigned* const Shifts = Pt == ROOK ? RookShifts : BishopShifts;
if (HasPext)
return unsigned(_pext_u64(occupied, Masks[s]));
return unsigned(pext(occupied, Masks[s]));
if (Is64Bit)
return unsigned(((occupied & Masks[s]) * Magics[s]) >> Shifts[s]);

3
src/types.h
View file

@ -71,8 +71,9 @@
#if defined(USE_PEXT)
# include <immintrin.h> // Header for _pext_u64() intrinsic
# define pext(b, m) _pext_u64(b, m)
#else
# define _pext_u64(b, m) (0)
# define pext(b, m) (0)
#endif
#ifdef _MSC_VER