From 10e2d9c7c532c204f26bb2c9f383f21b121b2ff2 Mon Sep 17 00:00:00 2001
From: Sai Praveen Bangaru <31557731+saipraveenb25@users.noreply.github.com>
Date: Mon, 27 Feb 2023 23:42:06 -0500
Subject: More fixes for reverse-mode on complicated loops (#2675)

* Multiple fixes to get various loop tests to pass.

* Create reverse-nested-loop.slang

* Fix for variables becoming inaccessible during cfg normalization

* Removed comments and moved break-branch-normalization to eliminateMultiLevelBreaks

* Fix.

* Override liveness tests
---
 tests/autodiff/reverse-continue-loop.slang | 43 ++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 tests/autodiff/reverse-continue-loop.slang

(limited to 'tests/autodiff/reverse-continue-loop.slang')

diff --git a/tests/autodiff/reverse-continue-loop.slang b/tests/autodiff/reverse-continue-loop.slang
new file mode 100644
index 000000000..0f9502673
--- /dev/null
+++ b/tests/autodiff/reverse-continue-loop.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_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+typedef DifferentialPair<float> dpfloat;
+typedef float.Differential dfloat;
+
+[BackwardDifferentiable]
+float test_loop_with_continue(float y)
+{
+    float t = y;
+
+    for (int i = 0; i < 3; i++)
+    {
+        if (t > 4.0)
+            continue;
+
+        t = t * t;
+    }
+
+    return t;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(uint3 dispatchThreadID : SV_DispatchThreadID)
+{
+    {
+        dpfloat dpa = dpfloat(2.0, 0.0);
+
+        __bwd_diff(test_loop_with_continue)(dpa, 1.0f);
+        outputBuffer[0] = dpa.d; // Expect: 32.0
+    }
+
+    {
+        dpfloat dpa = dpfloat(0.4, 0.0);
+
+        __bwd_diff(test_loop_with_continue)(dpa, 1.0f);
+        outputBuffer[1] = dpa.d; // Expect: 0.0131072
+    }
+}
-- 
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