From 86c7bcc9e326af56ec7bad64548a75e2b96e842b Mon Sep 17 00:00:00 2001
From: Faith Ekstrand <faith.ekstrand@collabora.com>
Date: Wed, 6 Sep 2023 18:20:28 -0500
Subject: [PATCH] nak/legalize: Fix too many IADD3 source modifiers

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>
---
 src/nouveau/compiler/nak_legalize.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/nouveau/compiler/nak_legalize.rs b/src/nouveau/compiler/nak_legalize.rs
index e539d9ee170..c8e1fb1178d 100644
--- a/src/nouveau/compiler/nak_legalize.rs
+++ b/src/nouveau/compiler/nak_legalize.rs
@@ -108,6 +108,14 @@ fn legalize_instr(b: &mut impl SSABuilder, instr: &mut Instr) {
             let [ref mut src0, ref mut src1, ref mut src2] = op.srcs;
             swap_srcs_if_not_reg(src0, src1);
             swap_srcs_if_not_reg(src2, src1);
+            if !src0.src_mod.is_none() && !src1.src_mod.is_none() {
+                let val = b.alloc_ssa(RegFile::GPR, 1);
+                b.push_op(OpIAdd3 {
+                    srcs: [Src::new_zero(), *src0, Src::new_zero()],
+                    dst: val.into(),
+                });
+                *src0 = val.into();
+            }
             copy_src_if_not_reg(b, src0, RegFile::GPR);
             copy_src_if_not_reg(b, src2, RegFile::GPR);
         }