Mesa (main): pan/bi: Refuse to CSE non-SSA sources

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Module: Mesa
Branch: main
Commit: 3e9411a75d7670fd619f8d1402998dbc7fc4d6cf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3e9411a75d7670fd619f8d1402998dbc7fc4d6cf

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Mon Jul 12 10:26:05 2021 -0400

pan/bi: Refuse to CSE non-SSA sources

They might have changed in between.

Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10961>

---

 src/panfrost/bifrost/bi_opt_cse.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/panfrost/bifrost/bi_opt_cse.c b/src/panfrost/bifrost/bi_opt_cse.c
index d97d337f691..832bae0313c 100644
--- a/src/panfrost/bifrost/bi_opt_cse.c
+++ b/src/panfrost/bifrost/bi_opt_cse.c
@@ -139,6 +139,12 @@ instr_can_cse(const bi_instr *I)
                         return false;
         }
 
+        /* Similar refuse to CSE non-SSA sources */
+        bi_foreach_src(I, s) {
+                if (I->src[s].reg || I->src[s].type == BI_INDEX_REGISTER)
+                        return false;
+        }
+
         return true;
 }