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Commitacd4855

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RyuJIT: Don't emit cast helpers for (T)array.Clone() (#45311)
Note that Array.Clone()'s return type is the same as the type of its first operand.This allows optimization of casts on the result of calls to Clone().
1 parentf8a83c8 commitacd4855

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4 files changed

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4 files changed

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‎src/coreclr/jit/gentree.cpp‎

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Original file line numberDiff line numberDiff line change
@@ -17757,6 +17757,14 @@ CORINFO_CLASS_HANDLE Compiler::gtGetClassHandle(GenTree* tree, bool* pIsExact, b
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case GT_CALL:
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{
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GenTreeCall* call = tree->AsCall();
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if (call->gtFlags & CORINFO_FLG_JIT_INTRINSIC)
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{
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if (lookupNamedIntrinsic(call->gtCallMethHnd) == NI_System_Array_Clone)
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{
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objClass = gtGetClassHandle(call->gtCallThisArg->GetNode(), pIsExact, pIsNonNull);
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break;
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}
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}
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if (call->IsInlineCandidate())
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{
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// For inline candidates, we've already cached the return

‎src/coreclr/jit/importer.cpp‎

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Original file line numberDiff line numberDiff line change
@@ -4809,6 +4809,13 @@ NamedIntrinsic Compiler::lookupNamedIntrinsic(CORINFO_METHOD_HANDLE method)
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result = NI_System_GC_KeepAlive;
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}
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}
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else if (strcmp(className, "Array") == 0)
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{
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if (strcmp(methodName, "Clone") == 0)
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{
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result = NI_System_Array_Clone;
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}
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}
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else if (strcmp(className, "Type") == 0)
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{
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if (strcmp(methodName, "get_IsValueType") == 0)

‎src/coreclr/jit/namedintrinsiclist.h‎

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Original file line numberDiff line numberDiff line change
@@ -43,6 +43,7 @@ enum NamedIntrinsic : unsigned short
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NI_System_Type_get_IsValueType,
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NI_System_Type_IsAssignableFrom,
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NI_System_Type_IsAssignableTo,
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NI_System_Array_Clone,
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// These are used by HWIntrinsics but are defined more generally
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// to allow dead code optimization and handle the recursion case

‎src/libraries/System.Private.CoreLib/src/System/Array.cs‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -319,6 +319,7 @@ void IList.RemoveAt(int index)
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// Make a new array which is a shallow copy of the original array.
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//
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[Intrinsic]
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publicobjectClone()
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{
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returnMemberwiseClone();

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