From 2d63f3dad6fc916c169f36b34d66df3a78258ae1 Mon Sep 17 00:00:00 2001
From: Benjamin Lee <benjamin@computer.surgery>
Date: Tue, 14 Nov 2023 22:52:37 -0800
Subject: [PATCH] nak: encode Dst::None as RZ on SM50

This case came up when testing VOTE, but likely occurs elsewhere.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26114>
---
 src/nouveau/compiler/nak/encode_sm50.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/nouveau/compiler/nak/encode_sm50.rs b/src/nouveau/compiler/nak/encode_sm50.rs
index f8dac3b9c18..fb24f9a5c5c 100644
--- a/src/nouveau/compiler/nak/encode_sm50.rs
+++ b/src/nouveau/compiler/nak/encode_sm50.rs
@@ -179,7 +179,12 @@ impl SM50Instr {
     }
 
     fn set_dst(&mut self, dst: Dst) {
-        self.set_reg(0..8, *dst.as_reg().unwrap());
+        let reg = match dst {
+            Dst::None => RegRef::zero(RegFile::GPR, 1),
+            Dst::Reg(reg) => reg,
+            _ => panic!("invalid dst {dst}"),
+        };
+        self.set_reg(0..8, reg);
     }
 
     fn set_src_imm32(&mut self, range: Range<usize>, u: u32) {