From b241b26d11994a7a96c2bed57479f546569ce6e8 Mon Sep 17 00:00:00 2001
From: Konstantin Seurer <konstantin.seurer@gmail.com>
Date: Fri, 7 Nov 2025 19:00:53 +0100
Subject: [PATCH] nir: Remove nir_def::parent_instr
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This reduces the footprint of nir_def by 8B on 64-bit systems.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Acked-by: Marek Olšák <maraeo@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38313>
---
 src/compiler/nir/nir.c | 1 -
 src/compiler/nir/nir.h | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/src/compiler/nir/nir.c b/src/compiler/nir/nir.c
index 65201352dfb..a1143675b47 100644
--- a/src/compiler/nir/nir.c
+++ b/src/compiler/nir/nir.c
@@ -1663,7 +1663,6 @@ nir_def_init(nir_instr *instr, nir_def *def,
              unsigned num_components,
              unsigned bit_size)
 {
-   def->parent_instr = instr;
    list_inithead(&def->uses);
    def->num_components = num_components;
    def->bit_size = bit_size;
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 7822e3de849..f3ba8222c65 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1002,9 +1002,6 @@ nir_instr_is_last(const nir_instr *instr)
 }
 
 typedef struct nir_def {
-   /** Instruction which produces this SSA value. */
-   nir_instr *parent_instr;
-
    /** set of nir_instrs where this register is used (read from) */
    struct list_head uses;