From 358d741b229ee6afd137ff9c01b6aad9782e1f81 Mon Sep 17 00:00:00 2001
From: Simon Perretta <simon.perretta@imgtec.com>
Date: Thu, 23 Jan 2025 18:54:11 +0000
Subject: [PATCH] pco: skip over empty blocks when iterating instructions

Signed-off-by: Simon Perretta <simon.perretta@imgtec.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36412>
---
 src/imagination/pco/pco_internal.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/imagination/pco/pco_internal.h b/src/imagination/pco/pco_internal.h
index 21497d5dc30..8d86f1cb0b3 100644
--- a/src/imagination/pco/pco_internal.h
+++ b/src/imagination/pco/pco_internal.h
@@ -1269,6 +1269,11 @@ static inline pco_instr *pco_next_instr(pco_instr *instr)
       return next_instr;
 
    pco_block *block = pco_next_block(instr->parent_block);
+
+   /* Skip over empty blocks. */
+   while (block && exec_list_is_empty(&block->instrs))
+      block = pco_next_block(block);
+
    return !block ? NULL : pco_first_instr(block);
 }
 
@@ -1289,6 +1294,11 @@ static inline pco_instr *pco_prev_instr(pco_instr *instr)
       return prev_instr;
 
    pco_block *block = pco_prev_block(instr->parent_block);
+
+   /* Skip over empty blocks. */
+   while (block && exec_list_is_empty(&block->instrs))
+      block = pco_prev_block(block);
+
    return !block ? NULL : pco_last_instr(block);
 }