On Mon, Feb 22, 2016 at 7:58 PM, Matt Turner <matts...@gmail.com> wrote: > On Mon, Feb 22, 2016 at 4:39 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: >> On Mon, Feb 22, 2016 at 7:13 PM, Matt Turner <matts...@gmail.com> wrote: >> >> Unless there's something unexpected going on, let's say >> >> src0 = 0, src1 = 0, src2 = -0.5 >> >>> Allows us to transform >>> >>> mad res src0 src1 src2 >> >> res = -0.5 > > I think you're assuming that MAD is src0 * src1 + src2, but it's > actually src0 + src1 * src2. > > Does that clear things up?
Considerably. Ignore my comments :) > > Generally, the thinking is to negate a MUL you negate one of its > arguments, and to negate an ADD you negate both of its arguments, so > to negate a MAD you negate one of the multiplicands and the additive > argument. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
