[PATCH] D134600: [RISCV][LLD] Add RISCV zcmt optimise in linker relaxation
Xinlong Wu via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sun Sep 25 04:27:41 PDT 2022
VincentWu created this revision.
VincentWu added reviewers: MaskRay, jrtc27, craig.topper, HsiangKai, asb, kito-cheng.
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This patch implements optimizations for the zcmt extension in lld.
A new `TableJumpSectio` has been added.
Scans each `R_RISCV_CALL/R_RISCV_CALL_PLT` relocType in each section before the linker relaxation, recording the name of the symbol.
In `finalizeContents` the recorded symbol names are sorted in descending order by the number of jumps.
Optimise and insert a new `cm.jt/cm.jalt` during the relax process. in the process, we reused the`R_RISCV_JAL` relocType
co-author: @ScottEgerton
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D134600
Files:
lld/ELF/Arch/RISCV.cpp
lld/ELF/Config.h
lld/ELF/Driver.cpp
lld/ELF/InputSection.h
lld/ELF/Options.td
lld/ELF/SyntheticSections.cpp
lld/ELF/SyntheticSections.h
lld/ELF/Target.h
lld/ELF/Writer.cpp
lld/test/ELF/riscv-tbljal-call.s
lld/test/ELF/riscv-tbljal-syms.s
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