src/cpu/aarch64/vm/macroAssembler_aarch64.cpp

rev 8694 : 8131362: aarch64: C2 does not handle large stack offsets
Summary: change spill code to allow large offsets
Reviewed-by: kvn, aph

*** 2304,2313 ****
--- 2304,2335 ----
    } else {
      return Address(r, r1, ext);
    }
  }
  
+ Address MacroAssembler::spill_address(int size, int offset, Register tmp)
+ {
+   assert(offset >= 0, "spill to negative address?");
+   // Offset reachable ?
+   //   Not aligned - 9 bits signed offset
+   //   Aligned - 12 bits unsigned offset shifted
+   Register base = sp;
+   if ((offset & (size-1)) && offset >= (1<<8)) {
+     add(tmp, base, offset & ((1<<12)-1));
+     base = tmp;
+     offset &= -1<<12;
+   }
+ 
+   if (offset >= (1<<12) * size) {
+     add(tmp, base, offset & (((1<<12)-1)<<12));
+     base = tmp;
+     offset &= ~(((1<<12)-1)<<12);
+   }
+ 
+   return Address(base, offset);
+ }
+ 
  /**
   * Multiply 64 bit by 64 bit first loop.
   */
  void MacroAssembler::multiply_64_x_64_loop(Register x, Register xstart, Register x_xstart,
                                             Register y, Register y_idx, Register z,