[llvm] [AVR] Wrap out-of-bounds relative jumps (PR #118015)

[Ben Shi via llvm-commits]

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@@ -86,13 +75,28 @@ static void adjustBranch(unsigned Size, const MCFixup &Fixup, uint64_t &Value,
 
 /// Adjusts the value of a relative branch target before fixup application.
 static void adjustRelativeBranch(unsigned Size, const MCFixup &Fixup,
-                                 uint64_t &Value, MCContext *Ctx = nullptr) {
+                                 uint64_t &Value, MCContext *Ctx) {
   // Jumps are relative to the current instruction.
   Value -= 2;
 
   // We have one extra bit of precision because the value is rightshifted by
   // one.
-  signed_width(Size + 1, Value, std::string("branch target"), Fixup, Ctx);
+  Size += 1;
+
+  if (!isIntN(Size, Value) &&
+      Ctx->getSubtargetInfo()->hasFeature(AVR::FeatureWrappingRjmp)) {
+    int32_t FlashSize = 0x2000;
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benshi001 wrote:

`const int32`

https://github.com/llvm/llvm-project/pull/118015