nir: Add a nir_opt_undef() to handle csels with undef.

We may find a cause to do more undef optimization in the future, but for
now this fixes up things after if flattening.  vc4 was handling this
internally most of the time, but a GLB2.7 shader that did a conditional
discard and assign gl_FragColor in the else was still emitting some extra
code.

total instructions in shared programs: 100809 -> 100795 (-0.01%)
instructions in affected programs:     37 -> 23 (-37.84%)

v2: Use nir_instr_rewrite_src() to update def/use on src[0] (by Thomas
    Helland).
v3: Make sure to flag metadata dirties, and copy the swizzle and abs/neg
    over to src[0], too (by anholt).

Reviewed-by: Thomas Helland <[email protected]> (v2)
Tested-by: Thomas Helland <[email protected]> (v2)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_program.c b/src/gallium/drivers/vc4/vc4_program.c
index e9120b7a1ff..4a3a277a9fb 100644
--- a/src/gallium/drivers/vc4/vc4_program.c
+++ b/src/gallium/drivers/vc4/vc4_program.c
@@ -1627,6 +1627,7 @@ vc4_optimize_nir(struct nir_shader *s)
                 progress = nir_opt_peephole_select(s) || progress;
                 progress = nir_opt_algebraic(s) || progress;
                 progress = nir_opt_constant_folding(s) || progress;
+                progress = nir_opt_undef(s) || progress;
         } while (progress);
 }