/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2016 SAP SE. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 *

 */

#ifndef CPU_S390_VM_C1_DEFS_S390_HPP

#define CPU_S390_VM_C1_DEFS_S390_HPP

// Native word offsets from memory address (big endian).

enum {

  pd_lo_word_offset_in_bytes = BytesPerInt,

  pd_hi_word_offset_in_bytes = 0

};

// Explicit rounding operations are not required to implement the strictFP mode.

enum {

  pd_strict_fp_requires_explicit_rounding = false

};

// registers

enum {

  pd_nof_cpu_regs_frame_map = 16,  // Number of registers used during code emission.

  // Treat all registers as caller save (values of callee save are hard to find if caller is in runtime).

  // unallocated: Z_thread, Z_fp, Z_SP, Z_R0_scratch, Z_R1_scratch, Z_R14

  pd_nof_cpu_regs_unallocated = 6,

  pd_nof_caller_save_cpu_regs_frame_map = pd_nof_cpu_regs_frame_map - pd_nof_cpu_regs_unallocated,  // Number of cpu registers killed by calls.

  pd_nof_cpu_regs_reg_alloc = pd_nof_caller_save_cpu_regs_frame_map,  // Number of registers that are visible to register allocator.

  pd_nof_cpu_regs_linearscan = pd_nof_cpu_regs_frame_map,// Number of registers visible linear scan.

  pd_first_cpu_reg = 0,

  pd_last_cpu_reg  = 9, // Others are unallocated (see FrameMap::initialize()).

  pd_nof_fpu_regs_frame_map = 16,  // Number of registers used during code emission.

  pd_nof_fcpu_regs_unallocated = 1, // Leave Z_F15 unallocated and use it as scratch register.

  pd_nof_caller_save_fpu_regs_frame_map = pd_nof_fpu_regs_frame_map - pd_nof_fcpu_regs_unallocated,  // Number of fpu registers killed by calls.

  pd_nof_fpu_regs_reg_alloc = pd_nof_caller_save_fpu_regs_frame_map,  // Number of registers that are visible to register allocator.

  pd_nof_fpu_regs_linearscan = pd_nof_fpu_regs_frame_map, // Number of registers visible to linear scan.

  pd_first_fpu_reg = pd_nof_cpu_regs_frame_map,

  pd_last_fpu_reg =  pd_first_fpu_reg + pd_nof_fpu_regs_frame_map - pd_nof_fcpu_regs_unallocated - 1,

  pd_nof_xmm_regs_linearscan = 0,

  pd_nof_caller_save_xmm_regs = 0,

  pd_first_xmm_reg = -1,

  pd_last_xmm_reg = -1

};

// For debug info: a float value in a register is saved in single precision by runtime stubs.

enum {

  pd_float_saved_as_double = false

};

#endif // CPU_S390_VM_C1_DEFS_S390_HPP