http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55734
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jakub at gcc dot gnu.org
--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-19
16:39:56 UTC ---
I guess a problem of such approach is if not in libgcov.a and HOST_WIDE_INT is
smaller than long long (or for clz even not exactly 64-bit).
For popcount, I wonder why the code uses __builtin_popcountll at all, when the
value is unsigned int, it should just use __builtin_popcount and I think we can
safely assume that HOST_WIDE_INT is at least as wide as int.
So just using either popcount_hwi or __builtin_popcount (no ll) should be fine.
For clz, there is:
if (v > 0)
r = 63 - __builtin_clzll (v);
i.e. it relies on clzll having exactly 64-bit argument. For __builtin_clzll
perhaps the assumption is fine, for clz_hwi not so. So you need some extra
code to implement clz_ll on top of clz_hwi if HWI is smaller than 64-bit.
