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It will get turned into SSA and copy-propagated in NIR, no need to walk the IR collapsing it here. iris shader-db results appear to be noise: total instructions in shared programs: 8932195 -> 8932147 (<.01%) instructions in affected programs: 537 -> 489 (-8.94%) LOST: 12 GAINED: 11 lost/gained are simd32 switches in unigine, l4d2, portal2, asphalt9. Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17613>