When "low alignment" is specified, then set the alignment of the aggregate's
store to 1. This allows code-gen to select a more appropriate alignment. If left
to zero, an alignment greater than the alignment of the pointer may be selected,
causing code-gen to use instructions which require an alignment greater than the
pointer guarantees.
<rdar://problem/11043589>
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152951 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 4fe4fa8..4455f1a 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -623,7 +623,9 @@
SI->setAlignment(1);
}
} else {
- CGF.Builder.CreateStore(Val, DestPtr, DestIsVolatile);
+ llvm::StoreInst *SI = CGF.Builder.CreateStore(Val, DestPtr, DestIsVolatile);
+ if (LowAlignment)
+ SI->setAlignment(1);
}
}