Differential D26971

Switch the arm64 pcpu to a global register variable
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Authored by andrew on Oct 27 2020, 2:54 PM.

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manu
emaste

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rG63c858a04d56: Switch the arm64 pcpu to a global register variable

Summary

This removes an unneeded instruction to move the pointer from x18 to a
temporary register.

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rG FreeBSD src repository

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Tests Not Applicable

Event Timeline

andrew created this revision.Oct 27 2020, 2:54 PM

Herald added a reviewer: manu. · View Herald TranscriptOct 27 2020, 2:54 PM

Herald added a subscriber: emaste. · View Herald Transcript

andrew requested review of this revision.Oct 27 2020, 2:54 PM

Harbormaster completed remote builds in B34414: Diff 78812.Oct 27 2020, 2:54 PM

Looks fine to me

GCC ref: https://gcc.gnu.org/onlinedocs/gcc/Global-Register-Variables.html#Global-Register-Variables
Some recentish LLVM discussion on general named global register variables: https://lists.llvm.org/pipermail/llvm-dev/2018-December/128706.html
Related patch: https://reviews.llvm.org/D68862

This revision is now accepted and ready to land.Jan 8 2021, 5:09 PM

Closed by commit rG63c858a04d56: Switch the arm64 pcpu to a global register variable (authored by andrew). · Explain WhyJan 13 2021, 4:43 PM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rG63c858a04d56: Switch the arm64 pcpu to a global register variable.

Revision Contents
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Path

Size

sys/

arm64/

include/

17 lines

Diff 82216

sys/arm64/include/pcpu.h

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