Support multi-level break + single-return conversion + general inline. (#2436)

* Support multi-level break.

* Single return.

* Add test for inlining `void` return-type functions.

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

4 files changed, 120 insertions, 0 deletions

diff --git a/tests/language-feature/general-inline.slang b/tests/language-feature/general-inline.slang
new file mode 100644
index 000000000..0fd323014
--- /dev/null
+++ b/tests/language-feature/general-inline.slang
@@ -0,0 +1,60 @@
+// multi-level-break.slang
+
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+[__unsafeForceInlineEarly]
+int test(int r)
+{
+    int result = 0;
+    for (int i = 0; i < 2; i++)
+    {
+        for (int j = 0; j < 3; j++)
+        {
+            result++;
+            if (r == 0)
+            {
+                return result;
+            }
+        }
+        if (r == 1)
+            return result;
+    }
+    return result;
+}
+
+[__unsafeForceInlineEarly]
+void testVoid(int r, out int result)
+{
+    result = 0;
+    for (int i = 0; i < 2; i++)
+    {
+        for (int j = 0; j < 3; j++)
+        {
+            result++;
+            if (r == 0)
+            {
+                return;
+            }
+        }
+        if (r == 1)
+            return;
+    }
+    return;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    outputBuffer[0] = test(0);
+    outputBuffer[1] = test(1);
+    outputBuffer[2] = test(2);
+
+    int rs;
+    testVoid(2, rs);
+    outputBuffer[3] = rs;
+}
diff --git a/tests/language-feature/general-inline.slang.expected.txt b/tests/language-feature/general-inline.slang.expected.txt
new file mode 100644
index 000000000..ab200b7cf
--- /dev/null
+++ b/tests/language-feature/general-inline.slang.expected.txt
@@ -0,0 +1,4 @@
+1
+3
+6
+6
diff --git a/tests/language-feature/multi-level-break.slang b/tests/language-feature/multi-level-break.slang
new file mode 100644
index 000000000..5ebe82e36
--- /dev/null
+++ b/tests/language-feature/multi-level-break.slang
@@ -0,0 +1,52 @@
+// multi-level-break.slang
+
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+int test(int r)
+{
+    int result = 0;
+iLoop:
+    for (int i = 0; i < 2; i++)
+    {
+    jLoop:
+        for (int j = 0; j < 3; j++)
+        {
+            for (;;)
+            {
+                result++;
+                if (r == 0)
+                {
+                    // When r == 0, we break out the outter most loop,
+                    // resulting the inner most statement being run only once.
+                    break iLoop;
+                }
+                else if (r == 1)
+                {
+                    // When r == 1, we break out the `j` loop,
+                    // resulting the inner most statement being run loop-i times.
+                    break jLoop;
+                }
+                else
+                {
+                    // When r takes other values, we break out the inner most loop p,
+                    // resulting the inner most statement being run i*j times.
+                    break;
+                }
+            }
+        }
+    }
+    return result;
+}
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    outputBuffer[0] = test(0);
+    outputBuffer[1] = test(1);
+    outputBuffer[2] = test(2);
+    outputBuffer[3] = 0;
+}
diff --git a/tests/language-feature/multi-level-break.slang.expected.txt b/tests/language-feature/multi-level-break.slang.expected.txt
new file mode 100644
index 000000000..bb18e9e15
--- /dev/null
+++ b/tests/language-feature/multi-level-break.slang.expected.txt
@@ -0,0 +1,4 @@
+1
+2
+6
+0