From d10b7691306bc3c2295a381458fb24056e70f825 Mon Sep 17 00:00:00 2001
From: Simon Perretta <simon.perretta@imgtec.com>
Date: Fri, 14 Mar 2025 15:38:36 +0000
Subject: [PATCH] pco: temporarily make vecs interfere with their components
 during regalloc

Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36412>
---
 src/imagination/pco/pco_ra.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/imagination/pco/pco_ra.c b/src/imagination/pco/pco_ra.c
index 454452537a0..15470dfdd49 100644
--- a/src/imagination/pco/pco_ra.c
+++ b/src/imagination/pco/pco_ra.c
@@ -388,6 +388,15 @@ static bool pco_ra_func(pco_func *func,
       }
    }
 
+   pco_foreach_instr_in_func_rev (vec, func) {
+      if (vec->op != PCO_OP_VEC)
+         continue;
+
+      pco_foreach_instr_src_ssa (psrc, vec) {
+         ra_add_node_interference(ra_graph, vec->dest[0].val, psrc->val);
+      }
+   }
+
    bool allocated = ra_allocate(ra_graph);
    assert(allocated);
    /* TODO: spilling. */