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Backport a fix addressing miscompliation related to TLS
this change backports a commit from upstream's release/18.x branch to address a miscompliation related to TLS. the fix addresses the issue where TLS variables could fail to initialize after the globalopt pass. this change has been backported to the release/18.x branch, but since LLVM 17.0.6 does not receive any more patches, we need to backport it in downstream. Signed-off-by: Kefu Chai <tchaikov@gmail.com>
This commit is contained in:
Kefu Chai
parent
79d4892286
commit
528cead504
2 changed files with 104 additions and 1 deletions
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@ -0,0 +1,97 @@
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From 3d0752b9492efd60e85aedec79676596af6fb4f8 Mon Sep 17 00:00:00 2001
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From: DianQK <dianqk@dianqk.net>
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Date: Fri, 17 May 2024 05:51:49 +0800
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Subject: [PATCH] [GlobalOpt] Don't replace aliasee with alias that has weak
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linkage (#91483)
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Fixes #91312.
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Don't perform the transform if the alias may be replaced at link time.
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(cherry picked from commit c79690040acf5bb3d857558b0878db47f7f23dc3)
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---
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llvm/lib/Transforms/IPO/GlobalOpt.cpp | 3 ++
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llvm/test/Transforms/GlobalOpt/alias-weak.ll | 57 ++++++++++++++++++++
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2 files changed, 60 insertions(+)
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create mode 100644 llvm/test/Transforms/GlobalOpt/alias-weak.ll
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diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
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index 951372adcfa9..619b3f612f25 100644
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--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
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+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
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@@ -2212,6 +2212,9 @@ static bool mayHaveOtherReferences(GlobalValue &GV, const LLVMUsed &U) {
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static bool hasUsesToReplace(GlobalAlias &GA, const LLVMUsed &U,
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bool &RenameTarget) {
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+ if (GA.isWeakForLinker())
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+ return false;
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+
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RenameTarget = false;
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bool Ret = false;
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if (hasUseOtherThanLLVMUsed(GA, U))
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diff --git a/llvm/test/Transforms/GlobalOpt/alias-weak.ll b/llvm/test/Transforms/GlobalOpt/alias-weak.ll
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new file mode 100644
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index 000000000000..aec2a56313b1
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--- /dev/null
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+++ b/llvm/test/Transforms/GlobalOpt/alias-weak.ll
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@@ -0,0 +1,57 @@
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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --include-generated-funcs --version 4
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+; RUN: opt < %s -passes=globalopt -S | FileCheck %s
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+
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+@f1_alias = linkonce_odr hidden alias void (), ptr @f1
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+@f2_alias = linkonce_odr hidden alias void (), ptr @f2
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+
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+define void @foo() {
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+ call void @f1_alias()
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+ ret void
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+}
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+
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+define void @bar() {
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+ call void @f1()
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+ ret void
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+}
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+
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+define void @baz() {
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+ call void @f2_alias()
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+ ret void
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+}
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+
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+; We cannot use `f1_alias` to replace `f1` because they are both in use
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+; and `f1_alias` could be replaced at link time.
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+define internal void @f1() {
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+ ret void
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+}
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+
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+; FIXME: We can use `f2_alias` to replace `f2` because `b2` is not in use.
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+define internal void @f2() {
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+ ret void
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+}
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+;.
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+; CHECK: @f1_alias = linkonce_odr hidden alias void (), ptr @f1
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+; CHECK: @f2_alias = linkonce_odr hidden alias void (), ptr @f2
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+;.
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+; CHECK-LABEL: define void @foo() local_unnamed_addr {
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+; CHECK-NEXT: call void @f1_alias()
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+; CHECK-NEXT: ret void
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+;
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+;
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+; CHECK-LABEL: define void @bar() local_unnamed_addr {
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+; CHECK-NEXT: call void @f1()
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+; CHECK-NEXT: ret void
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+;
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+;
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+; CHECK-LABEL: define void @baz() local_unnamed_addr {
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+; CHECK-NEXT: call void @f2_alias()
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+; CHECK-NEXT: ret void
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+;
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+;
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+; CHECK-LABEL: define internal void @f1() {
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+; CHECK-NEXT: ret void
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+;
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+;
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+; CHECK-LABEL: define internal void @f2() {
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+; CHECK-NEXT: ret void
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+;
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--
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2.45.1
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@ -93,7 +93,7 @@
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Name: %{pkg_name}
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Name: %{pkg_name}
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Version: %{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}%{?llvm_snapshot_version_suffix:~%{llvm_snapshot_version_suffix}}
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Version: %{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}%{?llvm_snapshot_version_suffix:~%{llvm_snapshot_version_suffix}}
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Release: 3%{?dist}
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Release: 4%{?dist}
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Summary: The Low Level Virtual Machine
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Summary: The Low Level Virtual Machine
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License: Apache-2.0 WITH LLVM-exception OR NCSA
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License: Apache-2.0 WITH LLVM-exception OR NCSA
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@ -115,6 +115,9 @@ Source6: release-keys.asc
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# Backport of https://reviews.llvm.org/D156485 for rhbz#2262260.
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# Backport of https://reviews.llvm.org/D156485 for rhbz#2262260.
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Patch0: 0001-PEI-Don-t-zero-out-noreg-operands.patch
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Patch0: 0001-PEI-Don-t-zero-out-noreg-operands.patch
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# https://github.com/llvm/llvm-project/commit/3d0752b9492efd60e85aedec79676596af6fb4f8
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# This patch will be in 18.1.6
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Patch1: 0001-GlobalOpt-Don-t-replace-aliasee-with-alias-that-has-.patch
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# RHEL-specific patch to avoid unwanted recommonmark dep
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# RHEL-specific patch to avoid unwanted recommonmark dep
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Patch101: 0101-Deactivate-markdown-doc.patch
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Patch101: 0101-Deactivate-markdown-doc.patch
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@ -614,6 +617,9 @@ fi
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%changelog
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%changelog
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%{?llvm_snapshot_changelog_entry}
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%{?llvm_snapshot_changelog_entry}
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* Thu May 30 2024 Kefu Chai <tchaikov@fedoraproject.org> - 17.0.6-4
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- Backport fix for https://github.com/llvm/llvm-project/issues/91312
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* Thu Feb 01 2024 Nikita Popov <npopov@redhat.com> - 17.0.6-3
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* Thu Feb 01 2024 Nikita Popov <npopov@redhat.com> - 17.0.6-3
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- Fix crash with -fzero-call-used-regs (rhbz#2262260)
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- Fix crash with -fzero-call-used-regs (rhbz#2262260)
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