yum-mirror/slang

Making it easier to work with shaders

git clone https://git.yummers.dev/yum-mirror/slang

ArielG-NVInitial copy elision pass regression fix (#8126)719772c01

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1//TEST(compute):COMPARE_COMPUTE_EX(filecheck-buffer=CHECK):-cuda -compute -shaderobj
2
3//TEST_INPUT:ubuffer(data=[1 1 1 1], stride=4),name=inputBuffer
4RWStructuredBuffer<int[2]> inputBuffer;
5
6//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
7RWStructuredBuffer<int> outputBuffer;
8
9void math(int data[2])
10{
11    // This test is to ensure that we do not break our optimization-pass which optimizes the IR of
12    // `getElement(load(getElementPtr(...)), ...)` into `load(getElementPtr(getElementPtr(...), ...))`.
13    //
14    // This test triggers the bug given the IR: `store(outputBuffer[0], getElement(Array<>, load(getElementPtr(data,0))))`.
15    // `Array<int,2>(5,6)` is not created as a local variable intentionally. We do this because we want to test the case
16    // where `Array<>` must be accessed as a value (`getElement`), not a pointer (`getElementPtr`).
17    //
18    // If this code fails, outputBuffer[0] will contain the value `1`. We expect `6` if the bug is fixed.
19    outputBuffer[0] = Array<int,2>(5,6)[data[0]];
20}
21
22[shader("compute")]
23[numthreads(1, 1, 1)]
24void computeMain(int3 id: SV_DispatchThreadID)
25{
26    math(inputBuffer[0]);
27}
28
29//CHECK: 6
30//CHECK-NEXT: 0