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[release/6.0] Fix CRC32 encoding - #60360
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On x64, when the crc32 instruction 2nd operand is a memory address (such as for a static field), and that address is containable (which normally doesn't happen, because the address will be above the 4GB lower address space), then the instruction was being improperly encoded.
ghost
commented
Oct 13, 2021
Tagging subscribers to this area: @JulieLeeMSFT Issue DetailsBackport of #60329 to release/6.0 /cc @BruceForstall Customer ImpactTestingRisk
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jeffschwMSFT
approved these changes
Oct 13, 2021
jeffschwMSFT
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Approved. Please get a code review and we can consider this one for .NET 6.
BruceForstall
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Oct 13, 2021
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@tannergooding PTAL: port of fix to .NET 6 |
Anipik
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Oct 14, 2021
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Backport of #60329 to release/6.0
/cc @BruceForstall
Customer Impact
This fixes a bug affecting an internal partner using .NET on special OS builds using low (<4GB) memory address space on x64 processors.
Testing
Hand testing, forcing low memory for a crc32 argument; plus normal CI testing and SPMI assembly diffs (none, as expected).
Risk
Very low: the change affects only one instruction (crc32), and only for the immediate addressing mode, which is not encountered on x64 except in this low-address-space system.