nir: Initialize source as a NULL SSA def

This keeps src_is_valid working without depending on registers.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24432>

diff --git a/src/compiler/nir/nir.c b/src/compiler/nir/nir.c
index 19d9a38..d87ec33 100644 (file)
--- a/src/compiler/nir/nir.c
+++ b/src/compiler/nir/nir.c
@@ -603,8 +603,8 @@ nir_block_create(nir_shader *shader)
 static inline void
 src_init(nir_src *src)
 {
-   src->is_ssa = false;
-   src->reg.reg = NULL;
+   src->is_ssa = true;
+   src->ssa = NULL;
 }
 
 nir_if *