From 6a43e6c9e0efa9ee6fafbac1fd011639c825f524 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Date: Tue, 21 Apr 2026 13:59:42 -0400
Subject: [PATCH] nir/opt_algebraic: add redundant u2u32/unpack_64_2x32_split_x
 patterns

reduces hello world kernel 57 -> 44 inst on jay. why do we have two opcodes that
do literally the same thing? :/

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41085>
---
 src/compiler/nir/nir_opt_algebraic.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index b065ca59181..d87d40f8402 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -2231,9 +2231,13 @@ optimizations.extend([
    # Reduce intermediate precision with int64.
    (('u2u32', ('iadd(is_used_once)', 'a@64', b)),
     ('iadd', ('u2u32', a), ('u2u32', b))),
+   (('unpack_64_2x32_split_x', ('iadd(is_used_once)', 'a@64', b)),
+    ('iadd', ('u2u32', a), ('u2u32', b))),
 
    (('u2u32', ('imul(is_used_once)', 'a@64', b)),
     ('imul', ('u2u32', a), ('u2u32', b))),
+   (('unpack_64_2x32_split_x', ('imul(is_used_once)', 'a@64', b)),
+    ('imul', ('u2u32', a), ('u2u32', b))),
 
    (('u2f32', ('u2u64', 'a@32')), ('u2f32', a)),