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Draft: nir/opt_algebraic: Combine ishl and iadd to imad

Christian Gmeiner requested to merge austriancoder/mesa:nir-combine-ishl-iadd into main

What does this MR do and why?

nir/opt_algebraic: Combine ishl and iadd to imad

There are some OpenCL kernels that produce this pattern:

    32     %3 = load_const (0x00000002)
    32     %4 = ishl %2.y, %3 (0x2)
    32     %5 = iadd %2.x, %4

This can be transformed to:

    %5 = imad %2.y, 4, %2.x

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>

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