In the ARM global merging pass, allow extraneous alignment specifiers. This pass

already makes the assumption, which is correct on ARM, that a type's alignment is
less than its alloc size. This improves codegen with Clang (which inserts a lot of
extraneous alignment specifiers) and fixes <rdar://problem/9695089>.

llvm-svn: 134106

1 files changed, 4 insertions, 2 deletions

diff --git a/llvm/lib/Target/ARM/ARMGlobalMerge.cpp b/llvm/lib/Target/ARM/ARMGlobalMerge.cpp
index 3f0238387a2..4bdd4f12d76 100644
--- a/llvm/lib/Target/ARM/ARMGlobalMerge.cpp
+++ b/llvm/lib/Target/ARM/ARMGlobalMerge.cpp
@@ -175,7 +175,9 @@ bool ARMGlobalMerge::doInitialization(Module &M) {
       continue;
 
     // Ignore fancy-aligned globals for now.
-    if (I->getAlignment() != 0)
+    unsigned Alignment = I->getAlignment();
+    unsigned AllocSize = TD->getTypeAllocSize(I->getType()->getElementType());
+    if (Alignment > AllocSize)
       continue;
 
     // Ignore all 'special' globals.
@@ -183,7 +185,7 @@ bool ARMGlobalMerge::doInitialization(Module &M) {
         I->getName().startswith(".llvm."))
       continue;
 
-    if (TD->getTypeAllocSize(I->getType()->getElementType()) < MaxOffset) {
+    if (AllocSize < MaxOffset) {
       const TargetLoweringObjectFile &TLOF = TLI->getObjFileLowering();
       if (TLOF.getKindForGlobal(I, TLI->getTargetMachine()).isBSSLocal())
         BSSGlobals.push_back(I);