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ARM64: Optimize pair of "ldr reg, [reg]" to ldp #35132

Description

@kunalspathak
ldr     x1, [x19,#16]
ldr     x2, [x19,#24]

can be combined into ldp if the loads are happening from subsequent memory.

ldp x1, x2, [x19, #16]

I collected no. of such ldr pairs in framework libraries and found approx. 5900 pairs in 3500 methods.

Details:

ldr_ldr_x_to_ldp.txt

category:cq
theme:optimization
skill-level:intermediate
cost:small
impact:medium

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  1. Dotnet-GitSync-Bot commented on Apr 17, 2020

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  2. added this to the Future milestone on Apr 20, 2020
  3. removed
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    on Apr 20, 2020
  4. modified the milestones: Future, 6.0.0 on Nov 9, 2020
  5. modified the milestones: 6.0.0, Future on Mar 23, 2021
  6. ghost added
    in-prThere is an active PR which will close this issue when it is merged
    on Apr 6, 2023
  7. ghost removed
    in-prThere is an active PR which will close this issue when it is merged
    on Apr 8, 2023
  8. ghost locked as resolved and limited conversation to collaborators on May 9, 2023
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    arch-arm64area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

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