[llvm-branch-commits] [llvm] release/20.x: [GlobalMerge][PPC] Don't merge globals in llvm.metadata section (#131801) (PR #134052)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport 9356091a98c24718572f99b51553838ed664b67a

Requested by: @<!-- -->nikic

---
Full diff: https://github.com/llvm/llvm-project/pull/134052.diff


2 Files Affected:

- (modified) llvm/lib/CodeGen/GlobalMerge.cpp (+2-1) 
- (added) llvm/test/CodeGen/PowerPC/global-merge-llvm-metadata.ll (+9) 


``````````diff
diff --git a/llvm/lib/CodeGen/GlobalMerge.cpp b/llvm/lib/CodeGen/GlobalMerge.cpp
index 5993fc939a08a..b4650a4851c3c 100644
--- a/llvm/lib/CodeGen/GlobalMerge.cpp
+++ b/llvm/lib/CodeGen/GlobalMerge.cpp
@@ -711,7 +711,8 @@ bool GlobalMergeImpl::run(Module &M) {
       continue;
 
     // Ignore all 'special' globals.
-    if (GV.getName().starts_with("llvm.") || GV.getName().starts_with(".llvm."))
+    if (GV.getName().starts_with("llvm.") ||
+        GV.getName().starts_with(".llvm.") || Section == "llvm.metadata")
       continue;
 
     // Ignore all "required" globals:
diff --git a/llvm/test/CodeGen/PowerPC/global-merge-llvm-metadata.ll b/llvm/test/CodeGen/PowerPC/global-merge-llvm-metadata.ll
new file mode 100644
index 0000000000000..7db092e13afeb
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/global-merge-llvm-metadata.ll
@@ -0,0 +1,9 @@
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
+
+ at index = global i32 0, align 4
+ at .str = private unnamed_addr constant [1 x i8] zeroinitializer, section "llvm.metadata"
+ at .str.1 = private unnamed_addr constant [7 x i8] c"test.c\00", section "llvm.metadata" 
+ at llvm.global.annotations = appending global [1 x { ptr, ptr, ptr, i32, ptr }] [{ ptr, ptr, ptr, i32, ptr } { ptr @index, ptr @.str, ptr @.str.1, i32 1, ptr null }], section "llvm.metadata"
+
+; CHECK-NOT: .set
+; CHECK-NOT: _MergedGlobals

``````````

</details>


https://github.com/llvm/llvm-project/pull/134052