================
@@ -4022,8 +4169,36 @@ LValue CodeGenFunction::EmitArraySubscriptExpr(const 
ArraySubscriptExpr *E,
       ArrayLV = EmitArraySubscriptExpr(ASE, /*Accessed*/ true);
     else
       ArrayLV = EmitLValue(Array);
+
     auto *Idx = EmitIdxAfterBase(/*Promote*/true);
 
+    if (SanOpts.has(SanitizerKind::ArrayBounds)) {
----------------
rjmccall wrote:

I understand that this patch specifically can be thought of as trying to do 
something fairly modest.  However, it is a part of a sequence of patches that I 
haven't been paying much attention to, and what it is actually doing makes me 
concerned about the larger sequence of patches and whether you might be 
implementing something that doesn't make a whole lot of sense. I am trying to 
understand what's going on to see if maybe I can course-correct and make sure 
that the overall feature is a good one.

https://github.com/llvm/llvm-project/pull/73730
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