From 2b257caea94fce2a5ef58dd303de9d73563b9126 Mon Sep 17 00:00:00 2001
From: Shaun Ren <sren@codeweavers.com>
Date: Fri, 30 May 2025 16:31:50 -0400
Subject: [PATCH] vkd3d-shader/hlsl: Don't optimize semantic register
 allocations in SM1.

This matches the behaviour of fxc/d3dcompiler.
---
 libs/vkd3d-shader/hlsl_codegen.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index 91f5646e8..f36ef06c1 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -6464,6 +6464,8 @@ static void allocate_semantic_register(struct hlsl_ctx *ctx, struct hlsl_ir_var
 
         if ((!output && !var->last_read) || (output && !var->first_write))
             return;
+
+        optimize = false;
     }
     else
     {