3 files changed, 49 insertions, 0 deletions
diff --git a/tests/autodiff/reverse-checkpoint-1.slang b/tests/autodiff/reverse-checkpoint-1.slang
index e503fb50f..beb983b3b 100644
--- a/tests/autodiff/reverse-checkpoint-1.slang
+++ b/tests/autodiff/reverse-checkpoint-1.slang
@@ -10,6 +10,7 @@ typedef DifferentialPair<float> dpfloat;
 typedef float.Differential dfloat;
 
 [BackwardDifferentiable]
+[PreferCheckpoint]
 float g(float x)
 {
     return log(x);
diff --git a/tests/autodiff/reverse-checkpoint-2.slang b/tests/autodiff/reverse-checkpoint-2.slang
new file mode 100644
index 000000000..bd787d83a
--- /dev/null
+++ b/tests/autodiff/reverse-checkpoint-2.slang
@@ -0,0 +1,43 @@
+//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):COMPARE_COMPUTE_EX:-cpu -compute -output-using-type -shaderobj
+//TEST:SIMPLE(filecheck=CHECK): -target hlsl -profile cs_5_0 -entry computeMain -line-directive-mode none
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef float.Differential dfloat;
+
+[BackwardDifferentiable]
+[PreferRecompute]
+float g(float x)
+{
+    return log(x);
+}
+
+[BackwardDifferentiable]
+float f(int p, float x)
+{
+    float y = 1.0;
+    // Test that phi parameter can be restored.
+    if (p == 0)
+        y = g(x);
+    return y * y;
+}
+
+// Check that there are no calls to primal_g in bwd_f.
+
+// CHECK: void s_bwd_f_{{[0-9]+}}
+// CHECK: {{[_a-zA-Z0-9]+}} = s_bwd_primal_g_{{[0-9]+}}
+// CHECK: return
+
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    dpfloat dpa = dpfloat(2.0, 0.0);
+
+    __bwd_diff(f)(0, dpa, 1.0f);
+    outputBuffer[0] = dpa.d; // Expect: 1
+}
diff --git a/tests/autodiff/reverse-checkpoint-2.slang.expected.txt b/tests/autodiff/reverse-checkpoint-2.slang.expected.txt
new file mode 100644
index 000000000..1ea0454e4
--- /dev/null
+++ b/tests/autodiff/reverse-checkpoint-2.slang.expected.txt
@@ -0,0 +1,5 @@
+type: float
+0.693147
+0.000000
+0.000000
+0.000000