[llvm] [COFF][Mips] Set PrivateGlobalPrefix to .L (PR #140033)

[via llvm-commits]

https://github.com/yingopq created https://github.com/llvm/llvm-project/pull/140033

When calling external functions which start with `L`, would generate error: assembler label 'LeaveFoo' can not be undefined. This pr would fix this issue.

Fix #134914.

>From dc21810a1d36c269bfef30d5562b39c6ffb04de7 Mon Sep 17 00:00:00 2001
From: Ying Huang <ying.huang at oss.cipunited.com>
Date: Thu, 15 May 2025 05:43:12 -0400
Subject: [PATCH] [COFF][Mips] Set PrivateGlobalPrefix to .L

When calling external functions which start with `L`, would generate
error: assembler label 'LeaveFoo' can not be undefined.
This pr would fix this issue.

Fix #134914.
---
 .../Mips/MCTargetDesc/MipsMCAsmInfo.cpp       |  2 ++
 .../CodeGen/Mips/private-global-prefix.ll     | 24 +++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 llvm/test/CodeGen/Mips/private-global-prefix.ll

diff --git a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
index 59c5bcb89bede..11df6fecaf37b 100644
--- a/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
+++ b/llvm/lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
@@ -53,5 +53,7 @@ MipsCOFFMCAsmInfo::MipsCOFFMCAsmInfo() {
 
   ExceptionsType = ExceptionHandling::WinEH;
 
+  PrivateGlobalPrefix = ".L";
+  PrivateLabelPrefix = ".L";
   AllowAtInName = true;
 }
diff --git a/llvm/test/CodeGen/Mips/private-global-prefix.ll b/llvm/test/CodeGen/Mips/private-global-prefix.ll
new file mode 100644
index 0000000000000..e60b9c1d7eba5
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/private-global-prefix.ll
@@ -0,0 +1,24 @@
+; RUN: llc -mtriple=mipsel-w64-windows-gnu < %s | FileCheck %s -check-prefix=MIPSEL
+
+define void @f() {
+; MIPSEL-LABEL: f:
+; MIPSEL:       # %bb.0: # %entry
+; MIPSEL-NEXT:    addiu $sp, $sp, -24
+; MIPSEL-NEXT:    sw $ra, 20($sp)
+; MIPSEL-NEXT:    jal LeaveFoo
+; MIPSEL-NEXT:    nop
+; MIPSEL-NEXT:    jal LocalBar
+; MIPSEL-NEXT:    nop
+; MIPSEL-NEXT:    lw $ra, 20($sp)
+; MIPSEL-NEXT:    jr $ra
+; MIPSEL-NEXT:    addiu	$sp, $sp, 24
+
+entry:
+  call void @LeaveFoo()
+  call void @LocalBar()
+  ret void
+}
+
+declare void @LeaveFoo()
+declare void @LocalBar()
+