Matt Turner <matts...@gmail.com> writes: > On Tue, Aug 18, 2015 at 6:49 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: >> Some shaders appear to extract bits using shift/and combos. Detect >> (some) of those and convert to EXTBF instead. > > What is EXTBF? Extract byte to float? > > I ask because Unigine Heaven has shaders that pack 3x byte-integers > into one component of a vec4 and extracts them with shifts/ands and > converts them to floats, and i965 could do the extraction and > conversion in a single instruction. I'm curious if this is the same > thing you're optimizing. > > I thought about adding an extract_byte(src, byte_num) operation, but > i965's copy propagation caused me some headache and I shelved it.
I could use this one, as int, uint, and unorm unpacks. Right now for int/uint I'm recognizing the pattern in vc4_program.c (in a branch). I'd be interested in writing the NIR bits if others are interested in having this.
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