Enable assembly output of local commons for AIX

Summary:
This patch enable assembly output of local commons for AIX using .lcomm
directives. Adds a EmitXCOFFLocalCommonSymbol to MCStreamer so we can emit the
AIX version of .lcomm assembly directives which include a csect name. Handle the
case of BSS locals in PPCAIXAsmPrinter by using EmitXCOFFLocalCommonSymbol. Adds
a test for generating .lcomm on AIX Targets.

Reviewers: cebowleratibm, hubert.reinterpretcast, Xiangling_L, jasonliu, sfertile

Reviewed By: sfertile

Subscribers: wuzish, nemanjai, hiraditya, kbarton, MaskRay, jsji, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64825

llvm-svn: 368306

1 files changed, 4 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index ac7c4c50ae4..7eb4901016a 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -1836,11 +1836,12 @@ MCSection *TargetLoweringObjectFileXCOFF::SelectSectionForGlobal(
 
   // Common symbols go into a csect with matching name which will get mapped
   // into the .bss section.
-  if (Kind.isCommon()) {
+  if (Kind.isBSSLocal() || Kind.isCommon()) {
     SmallString<128> Name;
     getNameWithPrefix(Name, GO, TM);
-    return getContext().getXCOFFSection(Name, XCOFF::XMC_RW, XCOFF::XTY_CM,
-                                        Kind, /* BeginSymbolName */ nullptr);
+    return getContext().getXCOFFSection(
+        Name, Kind.isBSSLocal() ? XCOFF::XMC_BS : XCOFF::XMC_RW, XCOFF::XTY_CM,
+        Kind, /* BeginSymbolName */ nullptr);
   }
 
   if (Kind.isText())