================
@@ -1209,8 +1301,21 @@ static void emitStoresForConstant(CodeGenModule &CGM,
const VarDecl &D,
// If the initializer is all or mostly the same, codegen with bzero / memset
// then do a few stores afterward.
if (shouldUseBZeroPlusStoresToInitialize(constant, ConstantSize)) {
- auto *I = Builder.CreateMemSet(Loc, llvm::ConstantInt::get(CGM.Int8Ty, 0),
- SizeVal, isVolatile);
+ size_t LeadingNonNullBytes =
+ CountLeadingNonNullBytes(CGM.getDataLayout(), constant);
----------------
efriedma-quic wrote:
I don't like the way this duplicates the logic. You aren't really trying to
count bytes that are "non-null"; you're trying to find the offset of the first
byte that isn't overwritten by emitStoresForInitAfterBZero. The best place to
compute that is emitStoresForInitAfterBZero itself.
https://github.com/llvm/llvm-project/pull/79502
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