8343699: [aarch64] Bug in MacroAssembler::klass_decode_mode()

Reviewed-by: adinn, coleenp
sendaoYan · Dec 5, 2024 · 456c71d · 456c71d
1 parent 308357c
commit 456c71d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp b/src/hotspot/cpu/aarch64/macroAssembler_aarch64.cpp
@@ -5305,7 +5305,7 @@ MacroAssembler::KlassDecodeMode MacroAssembler::klass_decode_mode() {
   if (operand_valid_for_logical_immediate(
         /*is32*/false, (uint64_t)CompressedKlassPointers::base())) {
     const size_t range = CompressedKlassPointers::klass_range_end() - CompressedKlassPointers::base();
-    const uint64_t range_mask = (1ULL << log2i(range)) - 1;
+    const uint64_t range_mask = right_n_bits(ceil_log2(range));
     if (((uint64_t)CompressedKlassPointers::base() & range_mask) == 0) {
       return (_klass_decode_mode = KlassDecodeXor);
     }