[llvm] [PowerPC] Fix assembler error with toc-data and data-sections (PR #91976)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: Zaara Syeda (syzaara)

<details>
<summary>Changes</summary>

We should not emit the label for the toc-data variable when data-sections=false.

---
Full diff: https://github.com/llvm/llvm-project/pull/91976.diff


2 Files Affected:

- (modified) llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp (+4-2) 
- (added) llvm/test/CodeGen/PowerPC/toc-data-no-data-sections.ll (+18) 


``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 51b79dc2b04b4..5f830d97986ca 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -2821,8 +2821,10 @@ void PPCAIXAsmPrinter::emitGlobalVariableHelper(const GlobalVariable *GV) {
 
   // When -fdata-sections is enabled, every GlobalVariable will
   // be put into its own csect; therefore, label is not necessary here.
-  if (!TM.getDataSections() || GV->hasSection())
-    OutStreamer->emitLabel(EmittedInitSym);
+  if (!TM.getDataSections() || GV->hasSection()) {
+    if (Csect->getMappingClass() != XCOFF::XMC_TD)
+      OutStreamer->emitLabel(EmittedInitSym);
+  }
 
   // No alias to emit.
   if (!GOAliasMap[GV].size()) {
diff --git a/llvm/test/CodeGen/PowerPC/toc-data-no-data-sections.ll b/llvm/test/CodeGen/PowerPC/toc-data-no-data-sections.ll
new file mode 100644
index 0000000000000..77851fb830253
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/toc-data-no-data-sections.ll
@@ -0,0 +1,18 @@
+; RUN: llc -mtriple powerpc64-ibm-aix-xcoff -data-sections=false -verify-machineinstrs < %s | FileCheck %s
+
+ at a1 = global i32 0, align 4 #0
+
+define void @foo() {
+entry:
+  store i32 1, ptr @a1, align 4
+  ret void
+}
+
+attributes #0 = { "toc-data" }
+
+; CHECK: .toc
+; CHECK-NEXT: .csect a1[TD],2
+; CHECK-NEXT: .globl  a1[TD]
+; CHECK-NEXT: .align  2
+; CHECK-NOT: a1[TD]:
+; CHECK-NEXT: .vbyte  4, 0

``````````

</details>


https://github.com/llvm/llvm-project/pull/91976