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Won't Fix
Votes
0
Found in [Package]
1.5.0
Issue ID
BUR-1022
Regression
No
[Burst] CPU feature checks are ignored
How to reproduce:
1. Open the attached project ("featureCheck.zip")
2. Open Jobs > Burst > Open Inspector
3. Inspect "Guards_Not_Considered_Across_Functions.Job"
4. Set CPU feature to AVX2
5. Notice no compilation errors
6. Set CPU feature to X86_SSE2
Expected results: No compilation errors, because there is an if clause with "Avx.IsAvxSupported" used in the Job
Actual results: Compilation errors for other selected CPU features
Reproducible with: Burst 1.4.3, 1.5.0-pre.3 (2020.2.2f1-dots.4, 2021.1.0b5, 2021.2.0a3)
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Resolution Note:
This is by design - we are not going to do calltree expansions on the intrinsic guards, as it is incredibly expensive and means we'd have to potentially visit each function N times for each combination of intrinsics used.
The user will have to re-guard in the sub function.