[Bug 89580] Implement a NIR -> vec4 pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89580

--- Comment #11 from Eduardo Lima Mitev <elima at igalia.com> ---
This is odd. In some piglit tests (like "bin/glean -o -v -v -v -t +api2"), I'm
getting a nir_shader with no uniforms declared, yet it loads and uses some:

NIR (final form) for vertex shader:
decl_var shader_in  vec4 in_0 (0, 0)
decl_var shader_out  vec4 out_0 (0, 0)
decl_overload main returning void

impl main {
    decl_reg vec4 r2
    decl_reg vec4 r3
    decl_reg vec1 r4
    decl_reg vec4 r5
    decl_reg vec1 r6
    decl_reg vec4 r7
    decl_reg vec1 r8
    decl_reg vec4 r9
    decl_reg vec1 r10
    decl_reg vec4 r11
    block block_0:
    /* preds: */
    r2 = intrinsic load_input () () (0, 1)
    r3 = intrinsic load_uniform () () (0, 1)
    r4 = fdot4 r2, r3
    r5 = intrinsic load_uniform () () (4, 1)
    r6 = fdot4 r2, r5
    r7 = intrinsic load_uniform () () (8, 1)
    r8 = fdot4 r2, r7
    r9 = intrinsic load_uniform () () (12, 1)
    r10 = fdot4 r2, r9
    r11 = vec4 r4, r6, r8, r10
    intrinsic store_output (r11) () (0, 1)
    /* succs: block_1 */
    block block_1:
}

This looks like a bug to me. Am I missing something?

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