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Fix crash with -fzero-call-used-regs (rhbz#2262260)

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Nikita Popov 2024-02-01 14:42:14 +01:00
parent 43a62dabf0
commit 79d4892286
2 changed files with 81 additions and 1 deletions
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74
0001-PEI-Don-t-zero-out-noreg-operands.patch Normal file
View file

@ -0,0 +1,74 @@
From 9d1f05a7b8537deb5f626cd1b7b26ef2678f4c8e Mon Sep 17 00:00:00 2001
From: Arthur Eubanks <aeubanks@google.com>
Date: Thu, 27 Jul 2023 13:27:58 -0700
Subject: [PATCH] [PEI] Don't zero out noreg operands
A tail call may have $noreg operands.
Fixes a crash.
Reviewed By: xgupta
Differential Revision: https://reviews.llvm.org/D156485
(cherry picked from commit f800c1f3b207e7bcdc8b4c7192928d9a078242a0)
---
llvm/lib/CodeGen/PrologEpilogInserter.cpp | 9 +++++++--
llvm/test/CodeGen/X86/zero-call-used-regs.ll | 14 ++++++++++++++
2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
index e323aaaeefaf..49047719fdaa 100644
--- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
@@ -1285,6 +1285,8 @@ void PEI::insertZeroCallUsedRegs(MachineFunction &MF) {
continue;
MCRegister Reg = MO.getReg();
+ if (!Reg)
+ continue;
// This picks up sibling registers (e.q. %al -> %ah).
for (MCRegUnit Unit : TRI.regunits(Reg))
@@ -1308,8 +1310,11 @@ void PEI::insertZeroCallUsedRegs(MachineFunction &MF) {
if (!MO.isReg())
continue;
- for (const MCPhysReg &Reg :
- TRI.sub_and_superregs_inclusive(MO.getReg()))
+ MCRegister Reg = MO.getReg();
+ if (!Reg)
+ continue;
+
+ for (const MCPhysReg Reg : TRI.sub_and_superregs_inclusive(Reg))
RegsToZero.reset(Reg);
}
}
diff --git a/llvm/test/CodeGen/X86/zero-call-used-regs.ll b/llvm/test/CodeGen/X86/zero-call-used-regs.ll
index 63d51c916bb9..97ad5ce9c8cb 100644
--- a/llvm/test/CodeGen/X86/zero-call-used-regs.ll
+++ b/llvm/test/CodeGen/X86/zero-call-used-regs.ll
@@ -241,6 +241,20 @@ entry:
ret i32 %x
}
+define dso_local void @tailcall(ptr %p) local_unnamed_addr #0 "zero-call-used-regs"="used-gpr" {
+; I386-LABEL: tailcall:
+; I386: # %bb.0:
+; I386-NEXT: movl {{[0-9]+}}(%esp), %eax
+; I386-NEXT: jmpl *(%eax) # TAILCALL
+;
+; X86-64-LABEL: tailcall:
+; X86-64: # %bb.0:
+; X86-64-NEXT: jmpq *(%rdi) # TAILCALL
+ %c = load ptr, ptr %p
+ tail call void %c()
+ ret void
+}
+
; Don't emit zeroing registers in "main" function.
define dso_local i32 @main() local_unnamed_addr #1 {
; I386-LABEL: main:
--
2.43.0

8
llvm.spec
View file

@ -93,7 +93,7 @@
Name: %{pkg_name}
Version: %{maj_ver}.%{min_ver}.%{patch_ver}%{?rc_ver:~rc%{rc_ver}}%{?llvm_snapshot_version_suffix:~%{llvm_snapshot_version_suffix}}
Release: 2%{?dist}
Release: 3%{?dist}
Summary: The Low Level Virtual Machine
License: Apache-2.0 WITH LLVM-exception OR NCSA
@ -113,6 +113,9 @@ Source5: https://github.com/llvm/llvm-project/releases/download/llvmorg-%{maj_ve
Source6: release-keys.asc
%endif
# Backport of https://reviews.llvm.org/D156485 for rhbz#2262260.
Patch0: 0001-PEI-Don-t-zero-out-noreg-operands.patch
# RHEL-specific patch to avoid unwanted recommonmark dep
Patch101: 0101-Deactivate-markdown-doc.patch
@ -611,6 +614,9 @@ fi
%changelog
%{?llvm_snapshot_changelog_entry}
* Thu Feb 01 2024 Nikita Popov <npopov@redhat.com> - 17.0.6-3
- Fix crash with -fzero-call-used-regs (rhbz#2262260)
* Thu Nov 30 2023 Tulio Magno Quites Machado Filho <tuliom@redhat.com> - 17.0.6-2
- Fix rhbz #2248872