src/hotspot/cpu/aarch64/c1_Defs_aarch64.hpp

8248238: Adding Windows support to OpenJDK on AArch64

Summary: Adding Windows support for AArch64

Contributed-by: Ludovic Henry <luhenry@microsoft.com>, Monica Beckwith <monica.beckwith@microsoft.com>
Reviewed-by:

@@ -42,29 +42,29 @@
 // registers
 enum {
   pd_nof_cpu_regs_frame_map = RegisterImpl::number_of_registers,       // number of registers used during code emission
   pd_nof_fpu_regs_frame_map = FloatRegisterImpl::number_of_registers,  // number of registers used during code emission
 
-  pd_nof_caller_save_cpu_regs_frame_map = 19 - 2,  // number of registers killed by calls
+  pd_nof_caller_save_cpu_regs_frame_map = 19 - 2 /* rscratch1 and rscratch2 */ WIN64_ONLY(- 1 /* r18 */),  // number of registers killed by calls
   pd_nof_caller_save_fpu_regs_frame_map = 32,  // number of registers killed by calls
 
-  pd_first_callee_saved_reg = 19 - 2,
-  pd_last_callee_saved_reg = 26 - 2,
+  pd_first_callee_saved_reg = 19 - 2 /* rscratch1 and rscratch2 */ WIN64_ONLY(- 1 /* r18 */),
+  pd_last_callee_saved_reg = 26 - 2 /* rscratch1 and rscratch2 */ WIN64_ONLY(- 1 /* r18 */),
 
-  pd_last_allocatable_cpu_reg = 16,
+  pd_last_allocatable_cpu_reg = 16 WIN64_ONLY(- 1 /* r18 */),
 
   pd_nof_cpu_regs_reg_alloc
     = pd_last_allocatable_cpu_reg + 1,  // number of registers that are visible to register allocator
   pd_nof_fpu_regs_reg_alloc = 8,  // number of registers that are visible to register allocator
 
   pd_nof_cpu_regs_linearscan = 32, // number of registers visible to linear scan
   pd_nof_fpu_regs_linearscan = pd_nof_fpu_regs_frame_map, // number of registers visible to linear scan
   pd_nof_xmm_regs_linearscan = 0, // like sparc we don't have any of these
   pd_first_cpu_reg = 0,
-  pd_last_cpu_reg = 16,
+  pd_last_cpu_reg = 16 WIN64_ONLY(- 1 /* r18 */),
   pd_first_byte_reg = 0,
-  pd_last_byte_reg = 16,
+  pd_last_byte_reg = 16 WIN64_ONLY(- 1 /* r18 */),
   pd_first_fpu_reg = pd_nof_cpu_regs_frame_map,
   pd_last_fpu_reg =  pd_first_fpu_reg + 31,
 
   pd_first_callee_saved_fpu_reg = 8 + pd_first_fpu_reg,
   pd_last_callee_saved_fpu_reg = 15 + pd_first_fpu_reg,