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2013-02-17host-utils: Use __int128_t for mul[us]64Richard Henderson1-9/+8
Replace some x86_64 specific inline assembly with something that all 64-bit hosts ought to optimize well. At worst this becomes a call to the gcc __multi3 routine, which is no worse than our implementation in util/host-utils.c. With gcc 4.7, we get identical code generation for x86_64. We now get native multiplication on ia64 and s390x hosts. With minor improvements to gcc we can get it for ppc64 as well. Signed-off-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-02-16host-utils: Fix coding style and add commentsRichard Henderson1-18/+82
Add function comments to the routines, documenting the corner cases upon which we are standardizing. Fix the few instances of non-standard coding style. Signed-off-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-02-16host-utils: Add host long specific aliases for clz, ctz, ctpopRichard Henderson1-0/+19
We will standardize on these names, rather than the similar routines currently residing in qemu/bitops.h. Signed-off-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-02-02bitops: unify bitops_ffsl with the one in host-utils.h, call it bitops_ctzlPaolo Bonzini1-26/+0
We had two copies of a ffs function for longs with subtly different semantics and, for the one in bitops.h, a confusing name: the result was off-by-one compared to the library function ffsl. Unify the functions into one, and solve the name problem by calling the 0-based functions "bitops_ctzl" and "bitops_ctol" respectively. This also fixes the build on platforms with ffsl, including Mac OS X and Windows. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Tested-by: Andreas Färber <afaerber@suse.de> Tested-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
2013-01-25host-utils: add ffslPaolo Bonzini1-0/+26
We can provide fast versions based on the other functions defined by host-utils.h. Some care is required on glibc, which provides ffsl already. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2012-12-19misc: move include files to include/qemu/Paolo Bonzini1-0/+240
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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