[PERF] Windows x86 Regression in BilinearTest.Interpol_AVX

[DrewScoggins]

This was found during the manual 7.0 -> 8.0 RC1 comparison. Linked below is a link to the test history.

https://pvscmdupload.blob.core.windows.net/reports/allTestHistory%2frefs%2fheads%2fmain_x86_Windows%2010.0.18362%2fBilinearTest.Interpol_AVX.html

The suspected commit affecting this is, https://github.com/dotnet/runtime/pull/84384.

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch See info in area-owners.md if you want to be subscribed.

Issue Details

---

This was found during the manual 7.0 -> 8.0 RC1 comparison. Linked below is a link to the test history. https://pvscmdupload.blob.core.windows.net/reports/allTestHistory%2frefs%2fheads%2fmain_x86_Windows%2010.0.18362%2fBilinearTest.Interpol_AVX.html The suspected commit affecting this is, https://github.com/dotnet/runtime/pull/84384.

Author:	DrewScoggins
Assignees:	-
Labels:	`tenet-performance`, `tenet-performance-benchmarks`, `area-CodeGen-coreclr`, `untriaged`, `needs-area-label`
Milestone:	-

[BruceForstall]

@EgorBo Can you take a look?

cc @tannergooding @khushal1996

[khushal1996]

cc @anthonycanino @DeepakRajendrakumaran

[EgorBo]

I don't see any codegen diffs for the given commit range locally

[EgorBo]

Method	Job	Toolchain	Mean	Error	StdDev	Ratio	Code Size
Interpol_AVX	Job-HJGTCR	\Core_Root\corerun.exe	3.959 us	0.6729 us	0.0369 us	1.01	906 B
Interpol_AVX	Job-DVKPPT	\Core_Root_base\corerun.exe	3.913 us	1.0288 us	0.0564 us	1.00	906 B

no perf or asm diffs between these commits on AMD 7950X + x86. Tried to enable/disable avx512, still no diffs. Could be some JCC erratum/intel specific? Moving to 9.0 since x86 has lower priority