From 967ad0bb4da04969bfc541f586a44861aa549644 Mon Sep 17 00:00:00 2001
From: Try <try9998@gmail.com>
Date: Thu, 28 Sep 2023 23:58:51 +0200
Subject: [PATCH] Fix unroll, when storing to pointer to array

#fixed #2196
---
 .../shaders-hlsl/comp/ssbo-store-array.comp   | 22 +++++++++++++++++++
 shaders-hlsl/comp/ssbo-store-array.comp       | 19 ++++++++++++++++
 spirv_hlsl.cpp                                |  7 +++++-
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 reference/shaders-hlsl/comp/ssbo-store-array.comp
 create mode 100644 shaders-hlsl/comp/ssbo-store-array.comp

diff --git a/reference/shaders-hlsl/comp/ssbo-store-array.comp b/reference/shaders-hlsl/comp/ssbo-store-array.comp
new file mode 100644
index 00000000..d078a380
--- /dev/null
+++ b/reference/shaders-hlsl/comp/ssbo-store-array.comp
@@ -0,0 +1,22 @@
+struct Data
+{
+    uint arr[3];
+};
+
+RWByteAddressBuffer _13 : register(u0);
+
+void comp_main()
+{
+    Data d1;
+    [unroll]
+    for (int _0ident = 0; _0ident < 3; _0ident++)
+    {
+        _13.Store(_0ident * 4 + 0, d1.arr[_0ident]);
+    }
+}
+
+[numthreads(1, 1, 1)]
+void main()
+{
+    comp_main();
+}
diff --git a/shaders-hlsl/comp/ssbo-store-array.comp b/shaders-hlsl/comp/ssbo-store-array.comp
new file mode 100644
index 00000000..dc2a508d
--- /dev/null
+++ b/shaders-hlsl/comp/ssbo-store-array.comp
@@ -0,0 +1,19 @@
+#version 460
+
+struct Data
+{
+    uint arr[3];
+};
+
+layout(set = 0, binding = 0, std430) buffer B0
+{
+    Data d[];
+};
+
+void main()
+{
+    Data d1;
+    d[0].arr = d1.arr;
+}
+
+
diff --git a/spirv_hlsl.cpp b/spirv_hlsl.cpp
index 8ba79b63..29b1e770 100644
--- a/spirv_hlsl.cpp
+++ b/spirv_hlsl.cpp
@@ -4696,7 +4696,12 @@ void CompilerHLSL::emit_load(const Instruction &instruction)
 void CompilerHLSL::write_access_chain_array(const SPIRAccessChain &chain, uint32_t value,
                                             const SmallVector<uint32_t> &composite_chain)
 {
-	auto &type = get<SPIRType>(chain.basetype);
+	auto *ptype = &get<SPIRType>(chain.basetype);
+	while (ptype->pointer)
+	{
+		ptype = &get<SPIRType>(ptype->basetype);
+	}
+	auto &type = *ptype;
 
 	// Need to use a reserved identifier here since it might shadow an identifier in the access chain input or other loops.
 	auto ident = get_unique_identifier();