PNaCl SIMD: allow element-aligned vector load/store

lib/Transforms/NaCl/StripAttributes.cpp

 //===- StripAttributes.cpp - Remove attributes not supported by PNaCl------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This pass strips out attributes that are not supported by PNaCl's
@@ skipping 145 matching lines @@
   // "private" symbols are omitted from the nexe's symbol table, which
   // would get in the way of debugging when an unstripped pexe is
   // translated offline.
   if (GV->getLinkage() == GlobalValue::PrivateLinkage)
     GV->setLinkage(GlobalValue::InternalLinkage);
 }
 
 static unsigned normalizeAlignment(DataLayout *DL, unsigned Alignment,
                                    Type *Ty, bool IsAtomic) {
   unsigned MaxAllowed = 1;
+  if (isa<VectorType>(Ty))
+    // Already handled properly by FixVectorLoadStoreAlignment.
+    return Alignment;
   if (Ty->isDoubleTy() || Ty->isFloatTy() || IsAtomic)
     MaxAllowed = DL->getTypeAllocSize(Ty);
   // If the alignment is set to 0, this means "use the default
   // alignment for the target", which we fill in explicitly.
   if (Alignment == 0 || Alignment >= MaxAllowed)
     return MaxAllowed;
   return 1;
 }
 
 void stripFunctionAttrs(DataLayout *DL, Function *Func) {
@@ skipping 55 matching lines @@
   for (Module::global_iterator GV = M.global_begin(), E = M.global_end();
        GV != E; ++GV) {
     stripGlobalValueAttrs(GV);
   }
   return true;
 }
 
 ModulePass *llvm::createStripAttributesPass() {
   return new StripAttributes();
 }