[backport][Clang] Fix crash with -fzero-call-used-reg

Signed-off-by: xiajingze <xiajingze1@huawei.com>

0028-backport-Clang-Fix-crash-with-fzero-call-used-regs.patch

@@ -0,0 +1,72 @@
+From 28e3fc80336935bc8bed372e78616ef5be9f4908 Mon Sep 17 00:00:00 2001
+From: Arthur Eubanks <aeubanks@google.com>
+Date: Thu, 27 Jul 2023 13:27:58 -0700
+Subject: [PATCH] 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
+---
+ 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
+

llvm.spec

@@ -46,7 +46,7 @@
 
 Name:		%{pkg_name}
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}
-Release:	23
+Release:	24
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -84,6 +84,7 @@ Patch24:	0024-Backport-LoongArch-fix-and-add-some-new-support.patch
 Patch25:    0025-Backport-Simple-check-to-ignore-Inline-asm-fwait-insertion.patch
 Patch26:    0026-Add-arch-restriction-for-BiSheng-Autotuner.patch
 Patch27:	0027-AArch64-Delete-hip09-macro.patch
+Patch28:	0028-backport-Clang-Fix-crash-with-fzero-call-used-regs.patch
 
 BuildRequires:	binutils-devel
 BuildRequires:	cmake
@@ -377,6 +378,9 @@ LD_LIBRARY_PATH=%{buildroot}/%{install_libdir} %{__ninja} check-all -C %{__cmake
 %{install_includedir}/llvm-gmock
 
 %changelog
+* Tue Nov 19 2024 xiajingze <xiajingze1@huawei.com> - 17.0.6-24
+- [backport][Clang] Fix crash with -fzero-call-used-regs
+
 * Mon Nov 18 2024 xiajingze <xiajingze1@huawei.com> - 17.0.6-23
 - [AArch64] Delete hip09 macro