Fix GLSL static initialization bug. (#3409)

* Fix GLSL static initialization bug.

Fixes #3408.

* Update comment.

* Fold global var initializer as an expression if possible.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

2 files changed, 37 insertions, 0 deletions

diff --git a/tests/bugs/gh-2959.slang b/tests/bugs/gh-2959.slang
new file mode 100644
index 000000000..b478fa938
--- /dev/null
+++ b/tests/bugs/gh-2959.slang
@@ -0,0 +1,16 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=BUF): -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name outputBuffer
+RWStructuredBuffer<uint> outputBuffer;
+
+static uint g_values[2] = { 0, 1 };
+
+[numthreads(2, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+	uint tid = dispatchThreadID.x;
+
+	outputBuffer[tid] = g_values[tid];
+    // BUF: 0
+    // BUF: 1
+}
diff --git a/tests/bugs/gh-3408.slang b/tests/bugs/gh-3408.slang
new file mode 100644
index 000000000..a24befe91
--- /dev/null
+++ b/tests/bugs/gh-3408.slang
@@ -0,0 +1,21 @@
+//TEST:SIMPLE(filecheck=CHECK): -entry computeMain -stage compute -target glsl
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=BUF): -shaderobj -vk
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(4, 1, 1)]
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
+{
+    // CHECK-NOT: {{\b}}if{{\b}}
+
+    int tid = dispatchThreadID.x;
+    
+    static int a[] = { 1, 2 };
+    
+	outputBuffer[dispatchThreadID.x] = a[tid & 1];
+    // BUF: 1
+    // BUF: 2
+    // BUF: 1
+    // BUF: 2
+}