Add defer statement (#6619)

20 files changed, 436 insertions, 0 deletions

diff --git a/tests/language-feature/defer/autodiff.slang b/tests/language-feature/defer/autodiff.slang
new file mode 100644
index 000000000..e7dd871fa
--- /dev/null
+++ b/tests/language-feature/defer/autodiff.slang
@@ -0,0 +1,56 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj -output-using-type
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<float> outputBuffer;
+
+[Differentiable]
+float testFunc(float a)
+{
+    float x = a / (abs(a) + 0.5f);
+    {
+        defer x = sqrt(x);
+
+        x = x * 0.5f + 0.5f;
+
+        if (a < 0)
+        {
+            x += 1.0f;
+            // NOTE suprising but correct behaviour here: 'defer' occurs after
+            // the return statement's value has been computed, so mutating 'x'
+            // no longer affects anything.
+            return x;
+        }
+
+        x += 0.5f;
+    }
+    return x;
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    outputBuffer[0] = testFunc(0);
+    outputBuffer[1] = testFunc(0.5);
+    outputBuffer[2] = testFunc(-0.5);
+
+    DifferentialPair<float> d1 = diffPair(0.0);
+    bwd_diff(testFunc)(d1, 1.0);
+    DifferentialPair<float> d2 = diffPair(0.5);
+    bwd_diff(testFunc)(d2, 1.0);
+    DifferentialPair<float> d3 = diffPair(-0.5);
+    bwd_diff(testFunc)(d3, 1.0);
+
+    outputBuffer[3] = d1.d;
+    outputBuffer[4] = d2.d;
+    outputBuffer[5] = d3.d;
+
+    d1 = diffPair(0.0, 1.0);
+    d2 = diffPair(0.5, 1.0);
+    d3 = diffPair(-0.5, 1.0);
+
+    outputBuffer[6] = fwd_diff(testFunc)(d1).d;
+    outputBuffer[7] = fwd_diff(testFunc)(d2).d;
+    outputBuffer[8] = fwd_diff(testFunc)(d3).d;
+}
diff --git a/tests/language-feature/defer/autodiff.slang.expected.txt b/tests/language-feature/defer/autodiff.slang.expected.txt
new file mode 100644
index 000000000..471a03b7c
--- /dev/null
+++ b/tests/language-feature/defer/autodiff.slang.expected.txt
@@ -0,0 +1,10 @@
+type: float
+1.000000
+1.118034
+1.250000
+0.500000
+0.111803
+0.250000
+0.500000
+0.111803
+0.250000
diff --git a/tests/language-feature/defer/complex-block.slang b/tests/language-feature/defer/complex-block.slang
new file mode 100644
index 000000000..c2d232035
--- /dev/null
+++ b/tests/language-feature/defer/complex-block.slang
@@ -0,0 +1,36 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    int j = 0;
+    defer {
+        if (j == 2)
+        {
+            outputBuffer[i++] = j;
+        }
+        else
+        {
+            outputBuffer[i++] = 2048;
+        }
+    }
+    defer {
+        if (j == 1)
+        {
+            outputBuffer[i++] = j;
+        }
+        else
+        {
+            outputBuffer[i++] = 1024;
+        }
+        j++;
+    }
+    outputBuffer[i++] = j;
+    j++;
+}
diff --git a/tests/language-feature/defer/complex-block.slang.expected.txt b/tests/language-feature/defer/complex-block.slang.expected.txt
new file mode 100644
index 000000000..4539bbf2d
--- /dev/null
+++ b/tests/language-feature/defer/complex-block.slang.expected.txt
@@ -0,0 +1,3 @@
+0
+1
+2
diff --git a/tests/language-feature/defer/deferred-loop.slang b/tests/language-feature/defer/deferred-loop.slang
new file mode 100644
index 000000000..0108dbbc1
--- /dev/null
+++ b/tests/language-feature/defer/deferred-loop.slang
@@ -0,0 +1,33 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    int j = 0;
+    defer {
+        defer outputBuffer[i++] = j*3+3;
+        outputBuffer[i++] = 1;
+        for (int k = 0; k < 6; ++k)
+        {
+            defer outputBuffer[i++] = k*3+2;
+
+            if(k == j-4)
+                continue;
+
+            outputBuffer[i++] = k*3;
+
+            if(k == j)
+                break;
+
+            outputBuffer[i++] = k*3+1;
+        }
+    }
+    outputBuffer[i++] = j;
+    j += 4;
+}
diff --git a/tests/language-feature/defer/deferred-loop.slang.expected.txt b/tests/language-feature/defer/deferred-loop.slang.expected.txt
new file mode 100644
index 000000000..6b625c8b4
--- /dev/null
+++ b/tests/language-feature/defer/deferred-loop.slang.expected.txt
@@ -0,0 +1,15 @@
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+A
+B
+C
+E
+F
diff --git a/tests/language-feature/defer/generics.slang b/tests/language-feature/defer/generics.slang
new file mode 100644
index 000000000..7ecd7de31
--- /dev/null
+++ b/tests/language-feature/defer/generics.slang
@@ -0,0 +1,48 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+interface IDroppable
+{
+    void drop(inout int i);
+};
+
+interface IDiscombobulatable
+{
+    void discombobulate(inout int i, int param);
+}
+
+void genericFunc<T>(int param)
+    where T : IDroppable, IDiscombobulatable
+{
+    T t;
+    int i = 0;
+    defer t.drop(i);
+
+    int p = param;
+    defer t.discombobulate(i, p);
+    t.discombobulate(i, p);
+    p += 1;
+}
+
+struct TestType : IDroppable, IDiscombobulatable
+{
+    void drop(inout int i)
+    {
+        outputBuffer[i++] = 0xFF;
+    }
+
+    void discombobulate(inout int i, int param)
+    {
+        outputBuffer[i++] = param;
+    }
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    genericFunc<TestType>(2);
+}
diff --git a/tests/language-feature/defer/generics.slang.expected.txt b/tests/language-feature/defer/generics.slang.expected.txt
new file mode 100644
index 000000000..4a7a64d00
--- /dev/null
+++ b/tests/language-feature/defer/generics.slang.expected.txt
@@ -0,0 +1,3 @@
+2
+3
+FF
diff --git a/tests/language-feature/defer/loop.slang b/tests/language-feature/defer/loop.slang
new file mode 100644
index 000000000..b51955a14
--- /dev/null
+++ b/tests/language-feature/defer/loop.slang
@@ -0,0 +1,30 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    defer outputBuffer[i++] = 128;
+    for (int j = 0; j < 4; j++)
+    {
+        defer outputBuffer[i++] = j*2+1;
+        outputBuffer[i++] = j*2;
+    }
+
+    for (int j = 0; j < 5; j++)
+    {
+        if (j == 1)
+            continue;
+        defer outputBuffer[i++] = j*2+1;
+        if (j == 2)
+            continue;
+        outputBuffer[i++] = j*2;
+        if (j == 3)
+            break;
+    }
+}
diff --git a/tests/language-feature/defer/loop.slang.expected.txt b/tests/language-feature/defer/loop.slang.expected.txt
new file mode 100644
index 000000000..cc7323432
--- /dev/null
+++ b/tests/language-feature/defer/loop.slang.expected.txt
@@ -0,0 +1,14 @@
+0
+1
+2
+3
+4
+5
+6
+7
+0
+1
+5
+6
+7
+80
diff --git a/tests/language-feature/defer/multiple-return.slang b/tests/language-feature/defer/multiple-return.slang
new file mode 100644
index 000000000..a364c288e
--- /dev/null
+++ b/tests/language-feature/defer/multiple-return.slang
@@ -0,0 +1,35 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//DISABLE_TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+// ^ Due to DeviceMemoryBarrier() missing.
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+void testFunc(int index1, int index2, int condition)
+{
+    outputBuffer[index1] = 128;
+    defer outputBuffer[index1] = 0;
+
+    outputBuffer[index2] = 3;
+    DeviceMemoryBarrier();
+
+    if (condition == 0)
+    {
+        outputBuffer[index2] = 1;
+        return;
+    }
+
+    if (condition == 1)
+    {
+        outputBuffer[index2] = 2;
+        return;
+    }
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    for (int i = 0; i < 3; ++i)
+        testFunc(2*i, 2*i+1, i);
+}
diff --git a/tests/language-feature/defer/multiple-return.slang.expected.txt b/tests/language-feature/defer/multiple-return.slang.expected.txt
new file mode 100644
index 000000000..5b06fc619
--- /dev/null
+++ b/tests/language-feature/defer/multiple-return.slang.expected.txt
@@ -0,0 +1,6 @@
+0
+1
+0
+2
+0
+3
diff --git a/tests/language-feature/defer/nested.slang b/tests/language-feature/defer/nested.slang
new file mode 100644
index 000000000..6de518209
--- /dev/null
+++ b/tests/language-feature/defer/nested.slang
@@ -0,0 +1,18 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    defer {
+        defer outputBuffer[i++] = 3;
+        defer outputBuffer[i++] = 2;
+        outputBuffer[i++] = 1;
+    }
+    outputBuffer[i++] = 0;
+}
diff --git a/tests/language-feature/defer/nested.slang.expected.txt b/tests/language-feature/defer/nested.slang.expected.txt
new file mode 100644
index 000000000..bc856dafa
--- /dev/null
+++ b/tests/language-feature/defer/nested.slang.expected.txt
@@ -0,0 +1,4 @@
+0
+1
+2
+3
diff --git a/tests/language-feature/defer/no-block.slang b/tests/language-feature/defer/no-block.slang
new file mode 100644
index 000000000..e78c91112
--- /dev/null
+++ b/tests/language-feature/defer/no-block.slang
@@ -0,0 +1,28 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    defer defer outputBuffer[i++] = 0xFF;
+
+    outputBuffer[i++] = 0;
+
+    for (int j = 0; j < 4; j++)
+        defer outputBuffer[i++] = j;
+
+    if (i == 5)
+        defer outputBuffer[i++] = 0x80;
+
+    while (i < 7)
+        defer outputBuffer[i++] = 0x81;
+
+    do defer outputBuffer[i++] = 0x82; while (false);
+
+    outputBuffer[i++] = 5;
+}
diff --git a/tests/language-feature/defer/no-block.slang.expected.txt b/tests/language-feature/defer/no-block.slang.expected.txt
new file mode 100644
index 000000000..ad8c0f654
--- /dev/null
+++ b/tests/language-feature/defer/no-block.slang.expected.txt
@@ -0,0 +1,10 @@
+0
+0
+1
+2
+3
+80
+81
+82
+5
+FF
diff --git a/tests/language-feature/defer/scoped.slang b/tests/language-feature/defer/scoped.slang
new file mode 100644
index 000000000..447c02357
--- /dev/null
+++ b/tests/language-feature/defer/scoped.slang
@@ -0,0 +1,33 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    int i = 0;
+    defer outputBuffer[i++] = 7;
+
+    {
+        defer outputBuffer[i++] = 0;
+    }
+
+    outputBuffer[i++] = 1;
+
+    {
+        defer outputBuffer[i++] = 2;
+    }
+
+    for (int j = 0; j < 4; ++j)
+    {
+        {
+            defer outputBuffer[i++] = j+3;
+            if (j == 2)
+                continue;
+        }
+        outputBuffer[i++] = j+0x13;
+    }
+}
diff --git a/tests/language-feature/defer/scoped.slang.expected.txt b/tests/language-feature/defer/scoped.slang.expected.txt
new file mode 100644
index 000000000..8d280bd37
--- /dev/null
+++ b/tests/language-feature/defer/scoped.slang.expected.txt
@@ -0,0 +1,11 @@
+0
+1
+2
+3
+13
+4
+14
+5
+6
+16
+7
diff --git a/tests/language-feature/defer/switch.slang b/tests/language-feature/defer/switch.slang
new file mode 100644
index 000000000..704e6e884
--- /dev/null
+++ b/tests/language-feature/defer/switch.slang
@@ -0,0 +1,34 @@
+//TEST(compute):COMPARE_COMPUTE: -shaderobj
+//TEST(compute):COMPARE_COMPUTE: -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE:-cpu -shaderobj
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+void testFunc(int i, int param)
+{
+    defer outputBuffer[i++] = param*3+2;
+    switch(param)
+    {
+    case 0:
+        defer outputBuffer[i++] = 1;
+        outputBuffer[i++] = 0;
+        break;
+    case 1:
+        defer outputBuffer[i++] = 4;
+        outputBuffer[i++] = 3;
+        break;
+    default:
+        defer outputBuffer[i++] = 7;
+        outputBuffer[i++] = 6;
+        break;
+    };
+}
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID: SV_DispatchThreadID)
+{
+    testFunc(0, 0);
+    testFunc(3, 1);
+    testFunc(6, 2);
+}
diff --git a/tests/language-feature/defer/switch.slang.expected.txt b/tests/language-feature/defer/switch.slang.expected.txt
new file mode 100644
index 000000000..1000f9005
--- /dev/null
+++ b/tests/language-feature/defer/switch.slang.expected.txt
@@ -0,0 +1,9 @@
+0
+1
+2
+3
+4
+5
+6
+7
+8