Introduce f[no-]max-unknown-pointer-align=[number] option
to instruct the code generator to not enforce a higher alignment
than the given number (of bytes) when accessing memory via an opaque
pointer or reference. Patch reviewed by John McCall (with post-commit
review pending). rdar://16254558
llvm-svn: 214911
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index 8496292..a200548 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -1399,8 +1399,13 @@
LValue MakeNaturalAlignAddrLValue(llvm::Value *V, QualType T) {
CharUnits Alignment;
- if (!T->isIncompleteType())
+ if (!T->isIncompleteType()) {
Alignment = getContext().getTypeAlignInChars(T);
+ unsigned MaxAlign = getContext().getLangOpts().MaxTypeAlign;
+ if (MaxAlign && Alignment.getQuantity() > MaxAlign &&
+ !getContext().isAlignmentRequired(T))
+ Alignment = CharUnits::fromQuantity(MaxAlign);
+ }
return LValue::MakeAddr(V, T, Alignment, getContext(),
CGM.getTBAAInfo(T));
}