Type legalization and autodiff bug fixes. (#2722)

* Bug fixes.

* Fix.

* Only perform autodiff for functions whose derivative is actually used.

* Fix loop optimize bug.

* Fix high order diff.

* Fix trivial diff func generation.

* Fixes.

* Cleanup.

---------

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

4 files changed, 59 insertions, 0 deletions

diff --git a/tests/autodiff-dstdlib/determinant.slang b/tests/autodiff-dstdlib/determinant.slang
new file mode 100644
index 000000000..d2e699551
--- /dev/null
+++ b/tests/autodiff-dstdlib/determinant.slang
@@ -0,0 +1,24 @@
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+[BackwardDifferentiable]
+float diffDeterminant(float2x2 x)
+{
+    return determinant(x);
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    {
+        var dpx = diffPair(float2x2(1.0, 2.0, 3.0, 4.0));
+        __bwd_diff(diffDeterminant)(dpx, 1.0);
+        outputBuffer[0] = dpx.d[0][0];
+        outputBuffer[1] = dpx.d[0][1];
+        outputBuffer[2] = dpx.d[1][0];
+        outputBuffer[3] = dpx.d[1][1];
+    }
+}
diff --git a/tests/autodiff-dstdlib/determinant.slang.expected.txt b/tests/autodiff-dstdlib/determinant.slang.expected.txt
new file mode 100644
index 000000000..b2c2f7e17
--- /dev/null
+++ b/tests/autodiff-dstdlib/determinant.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+4.000000
+-3.000000
+-2.000000
+1.000000
diff --git a/tests/bugs/loop-optimize.slang b/tests/bugs/loop-optimize.slang
new file mode 100644
index 000000000..85231dbea
--- /dev/null
+++ b/tests/bugs/loop-optimize.slang
@@ -0,0 +1,28 @@
+//TEST(compute):COMPARE_COMPUTE_EX:-slang -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-vk -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-cpu -compute -shaderobj -output-using-type
+//TEST(compute, vulkan):COMPARE_COMPUTE_EX:-cuda -compute -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0], stride=4):out,name outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+void test(inout float v, int i)
+{
+    while (true)
+    {
+        i--;
+        if (i < 2)
+        {
+            v += 1.0;
+            return;
+        }
+    }
+}
+
+[numthreads(4, 1, 1)]
+void computeMain(uint3 dispatchThreadID: SV_DispatchThreadID)
+{
+    float v = 2.0;
+    test(v, 3);
+    outputBuffer[0] = v; // Expect 3.0
+}
\ No newline at end of file
diff --git a/tests/bugs/loop-optimize.slang.expected.txt b/tests/bugs/loop-optimize.slang.expected.txt
new file mode 100644
index 000000000..f38cc1080
--- /dev/null
+++ b/tests/bugs/loop-optimize.slang.expected.txt
@@ -0,0 +1,2 @@
+type: float
+3.0