src/cpu/aarch64/vm/jniFastGetField_aarch64.cpp

rev 13098 : 8182161: aarch64: combine andr+cbnz into tbnz when possible
Summary: Combine andr+cbnz into tbnz when possible to save one instruction
Reviewed-by: aph

@@ -74,12 +74,11 @@
   unsigned long offset;
   __ adrp(rcounter_addr,
           SafepointSynchronize::safepoint_counter_addr(), offset);
   Address safepoint_counter_addr(rcounter_addr, offset);
   __ ldrw(rcounter, safepoint_counter_addr);
-  __ andw(rscratch1, rcounter, 1);
-  __ cbnzw(rscratch1, slow);
+  __ tbnz(rcounter, 0, slow);
   __ eor(robj, c_rarg1, rcounter);
   __ eor(robj, robj, rcounter);               // obj, since
                                               // robj ^ rcounter ^ rcounter == robj
                                               // robj is address dependent on rcounter.