[clang] [clang][bytecode] Use existing Descriptor local in InitElem op (PR #160535)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

Instead of going the way through `Pointer::isUnknownSizeArray()`.

---
Full diff: https://github.com/llvm/llvm-project/pull/160535.diff


1 Files Affected:

- (modified) clang/lib/AST/ByteCode/Interp.h (+4-4) 


``````````diff
diff --git a/clang/lib/AST/ByteCode/Interp.h b/clang/lib/AST/ByteCode/Interp.h
index 3bc1a67feeba2..df676c79cbb31 100644
--- a/clang/lib/AST/ByteCode/Interp.h
+++ b/clang/lib/AST/ByteCode/Interp.h
@@ -2126,10 +2126,10 @@ bool InitElem(InterpState &S, CodePtr OpPC, uint32_t Idx) {
   const T &Value = S.Stk.pop<T>();
   const Pointer &Ptr = S.Stk.peek<Pointer>();
 
-  if (Ptr.isUnknownSizeArray())
+  const Descriptor *Desc = Ptr.getFieldDesc();
+  if (Desc->isUnknownSizeArray())
     return false;
 
-  const Descriptor *Desc = Ptr.getFieldDesc();
   // In the unlikely event that we're initializing the first item of
   // a non-array, skip the atIndex().
   if (Idx == 0 && !Desc->isArray()) {
@@ -2160,10 +2160,10 @@ bool InitElemPop(InterpState &S, CodePtr OpPC, uint32_t Idx) {
   const T &Value = S.Stk.pop<T>();
   const Pointer &Ptr = S.Stk.pop<Pointer>();
 
-  if (Ptr.isUnknownSizeArray())
+  const Descriptor *Desc = Ptr.getFieldDesc();
+  if (Desc->isUnknownSizeArray())
     return false;
 
-  const Descriptor *Desc = Ptr.getFieldDesc();
   // In the unlikely event that we're initializing the first item of
   // a non-array, skip the atIndex().
   if (Idx == 0 && !Desc->isArray()) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/160535