}
}
+ // Check to see if we are doing a copy to/from the same local block.
+ // If so, morph it to a nop.
+ if ((destLclVar != nullptr) && (srcLclVar == destLclVar) && (destFldSeq == srcFldSeq) &&
+ destFldSeq != FieldSeqStore::NotAField())
+ {
+ JITDUMP("Self-copy; replaced with a NOP.\n");
+ GenTree* nop = gtNewNothingNode();
+ INDEBUG(nop->gtDebugFlags |= GTF_DEBUG_NODE_MORPHED);
+ return nop;
+ }
+
// Check to see if we are required to do a copy block because the struct contains holes
// and either the src or dest is externally visible
//
bool srcSingleLclVarAsg = false;
bool destSingleLclVarAsg = false;
- if ((destLclVar != nullptr) && (srcLclVar == destLclVar) && (destFldSeq == srcFldSeq))
- {
- // Self-assign; no effect.
- GenTree* nop = gtNewNothingNode();
- INDEBUG(nop->gtDebugFlags |= GTF_DEBUG_NODE_MORPHED);
- return nop;
- }
-
// If either src or dest is a reg-sized non-field-addressed struct, keep the copyBlock.
if ((destLclVar != nullptr && destLclVar->lvRegStruct) || (srcLclVar != nullptr && srcLclVar->lvRegStruct))
{