Quoting Paul B Mahol (2020-10-06 10:19:13)
> On Tue, Oct 06, 2020 at 10:08:58AM +0200, Anton Khirnov wrote:
> > Quoting Paul B Mahol (2020-10-06 02:17:14)
> > > Signed-off-by: Paul B Mahol <one...@gmail.com>
> > > ---
> > > libavcodec/apedec.c | 10 +++-------
> > > 1 file changed, 3 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
> > > index 8fe7b5ee86..ea36247eb9 100644
> > > --- a/libavcodec/apedec.c
> > > +++ b/libavcodec/apedec.c
> > > @@ -575,14 +575,10 @@ static inline int ape_decode_value_3990(APEContext
> > > *ctx, APERice *rice)
> > > base = range_decode_culfreq(ctx, pivot);
> > > range_decode_update(ctx, 1, base);
> > > } else {
> > > - int base_hi = pivot, base_lo;
> > > - int bbits = 0;
> > > + int base_hi, base_lo;
> > > + int bbits = 16 - ff_clz(pivot);
> >
> > This assumes unsigned is always 32bit, no?
>
> ksum is 32 bit, from which pivot is derived.
>
> Should I use explicitly uint32_t type instead?
> Where is unsigned not 32bit?
I don't think uint32_t would help, as ff_clz() can expand to a compiler
builtin.
What I'm concerned about is the unstated assumption about
sizeof(int/unsigned) == 4 spreading through the codebase. It's already
present in plenty of places, so I certainly don't intend to block your
patch over this. But we should consider explitly documenting this, and
maybe testing in configure.
--
Anton Khirnov
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