From 77ecad28cfb0d17b8d3a93fb7c08be4217eb2433 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Thu, 5 Sep 2024 11:24:43 -0700
Subject: Fix spirv emit for global pointer variable. (#5009)

---
 source/slang/slang-emit-spirv.cpp |  2 +-
 tests/spirv/global-pointer.slang  | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 tests/spirv/global-pointer.slang

diff --git a/source/slang/slang-emit-spirv.cpp b/source/slang/slang-emit-spirv.cpp
index bb1f1378f..9088e959a 100644
--- a/source/slang/slang-emit-spirv.cpp
+++ b/source/slang/slang-emit-spirv.cpp
@@ -4572,7 +4572,7 @@ struct SPIRVEmitContext
                     getSection(SpvLogicalSectionID::Annotations),
                     nullptr,
                     varInst,
-                    (as<IRVar>(inst) ? SpvDecorationAliasedPointer : SpvDecorationAliased)
+                    (inst->getOp() == kIROp_GlobalVar || inst->getOp() == kIROp_Var ? SpvDecorationAliasedPointer : SpvDecorationAliased)
                 );
             }
         }
diff --git a/tests/spirv/global-pointer.slang b/tests/spirv/global-pointer.slang
new file mode 100644
index 000000000..e373920eb
--- /dev/null
+++ b/tests/spirv/global-pointer.slang
@@ -0,0 +1,14 @@
+//TEST:SIMPLE(filecheck=CHECK): -target spirv
+
+// CHECK: OpDecorate %g_Instance AliasedPointer
+
+static int* g_Instance = nullptr;
+
+[vk::push_constant] int* dest;
+
+[numthreads(1)]
+void ComputeMain(int tid : SV_DispatchThreadID) {
+    // int* g_Instance = nullptr;
+    if (tid % 2 == 0) g_Instance = dest;
+    if (g_Instance) g_Instance[tid] = 123;
+}
\ No newline at end of file
-- 
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