Fix

Author: Kai Luo

llvm/lib/IR/Globals.cpp

@@ -335,6 +335,14 @@ bool GlobalObject::canIncreaseAlignment() const {
   if (isELF && !isDSOLocal())
     return false;
 
+  bool isXCOFF =
+      (!Parent || Triple(Parent->getTargetTriple()).isOSBinFormatXCOFF());
+  if (isXCOFF)
+    if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this))
+      // GV with toc-data attribute is put in the region same as toc entry.
+      // Its alignment should be the same as toc entry.
+      return !GV->hasAttribute("toc-data");
+
   return true;
 }
 

llvm/test/CodeGen/PowerPC/tocdata-firm-alignment.ll

@@ -5,7 +5,7 @@ target triple = "powerpc-ibm-aix7.2.0.0"
 
 %struct.widget = type { i8, i8, i8 }
 
-; CHECK: @global = {{.*}}constant %struct.widget { i8 4, i8 0, i8 0 }, align 8 #0
+; CHECK: @global = {{.*}}constant %struct.widget { i8 4, i8 0, i8 0 }, align 4 #0
 @global = constant %struct.widget { i8 4, i8 0, i8 0 }, align 4 #0
 
 define void @baz() #1 {