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Instead of emitting a pile of moves to fixed registers at codegen time and hoping everything works out, add a second staging source to the BLEND instruction in the intermediate representation containing the dual source colour, and modify register allocation appropriately. This better models the operation of blending render target #0 with two sources. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <mesa/mesa!13714>
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