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[SM6.9] compiler crash with Load with status #7508
Description
Description
When compiling a simple load of a vector in SM6.9 DXC crashes when a status parameter is present. The same shader code compiles with earlier shader models, and also with scalar values.
Steps to Reproduce
// -T cs_6_9 -E main
ByteAddressBuffer Buf : register(t0);
[numthreads(32, 1, 1)]
void main(uint3 gtid : SV_GroupThreadID, uint gidx : SV_GroupIndex)
{
uint status;
uint2 vec2 = Buf.Load < uint2 > (0, status);
}
See https://godbolt.org/z/o6aob9M8z
Actual Behavior
Internal compiler error: LLVM Assert
Environment
- DXC version (dxcompiler.dll: 1.9 - 1.8.0.14932 (main, 474f9d2))
- Host Operating System: (Windows 11 Pro 26100.4202)
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pow2clk commentedon Jun 4, 2025
I have the root cause. We were using the old index to extract the status from the resret. Previously, this contained 4 scalars followed by the status. Now it is just a vector followed by the status. The fix is simple enough. I could have sworn that I had testing that would have covered this, but as we clearly don't, I'll need to add that and do a survey of other areas that might hit similar issues. I expect this will require a point release.
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