[PATCH] D146876: [ThinLTO] Only import for non-prevailing interposable global variables
Shoaib Meenai via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Mar 25 09:26:33 PDT 2023
smeenai created this revision.
smeenai added a reviewer: tejohnson.
Herald added subscribers: ormris, steven_wu, hiraditya, inglorion.
Herald added a project: All.
smeenai requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
This logic was added in https://reviews.llvm.org/D95943 specifically to
handle an issue for non-prevailing global variables. It turns out that
it adds a new issue for prevailing glboal variables, since those could
be replaced by an available_externally definition and hence incorrectly
omitted from the output object file. Limit the import to non-prevailing
global variables to fix this, as suggested by @tejohnson.
The bulk of the diff is mechanical changes to thread isPrevailing
through to where it's needed and ensure it's available before the
relevant calls; the actual logic change itself is straightforward.
Fixes https://github.com/llvm/llvm-project/issues/61677
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D146876
Files:
llvm/include/llvm/Transforms/IPO/FunctionImport.h
llvm/lib/LTO/LTO.cpp
llvm/lib/LTO/ThinLTOCodeGenerator.cpp
llvm/lib/Transforms/IPO/FunctionImport.cpp
llvm/test/ThinLTO/X86/nonprevailing_weak_globals_import.ll
llvm/test/ThinLTO/X86/prevailing_weak_globals_import.ll
llvm/test/ThinLTO/X86/weak_globals_import.ll
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