e2b3c7c7cf
the unconditional use of __builtin_popcount if using GCC. Eliminates the need for a newer GCC version. ok ajacoutot@
17 lines
817 B
Plaintext
17 lines
817 B
Plaintext
$OpenBSD: patch-include_openbabel_fingerprint_h,v 1.1 2008/09/01 08:51:03 brad Exp $
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--- include/openbabel/fingerprint.h.orig Sun Aug 31 22:58:48 2008
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+++ include/openbabel/fingerprint.h Sun Aug 31 23:01:45 2008
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@@ -90,7 +90,11 @@ const char* TypeID() (public)
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int andfp = vec1[i] & p2[i];
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int orfp = vec1[i] | p2[i];
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// Count bits
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-#ifdef __GNUC__
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+ /* GCC 3.4 supports a "population count" builtin, which on many targets is
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+ implemented with a single instruction. There is a fallback definition
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+ in libgcc in case a target does not have one, which should be just as
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+ good as the static function below. */
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+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
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andbits += __builtin_popcount(andfp);
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orbits += __builtin_popcount(orfp);
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#else
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