/*
 * z_Windows_NT-586_util.cpp -- platform specific routines.
 */

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "kmp.h"

#if (KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_AARCH64 || KMP_ARCH_ARM)
/* Only 32-bit "add-exchange" instruction on IA-32 architecture causes us to
   use compare_and_store for these routines */

kmp_int8 __kmp_test_then_or8(volatile kmp_int8 *p, kmp_int8 d) {
  kmp_int8 old_value, new_value;

  old_value = TCR_1(*p);
  new_value = old_value | d;

  while (!KMP_COMPARE_AND_STORE_REL8(p, old_value, new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_1(*p);
    new_value = old_value | d;
  }
  return old_value;
}

kmp_int8 __kmp_test_then_and8(volatile kmp_int8 *p, kmp_int8 d) {
  kmp_int8 old_value, new_value;

  old_value = TCR_1(*p);
  new_value = old_value & d;

  while (!KMP_COMPARE_AND_STORE_REL8(p, old_value, new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_1(*p);
    new_value = old_value & d;
  }
  return old_value;
}

kmp_uint32 __kmp_test_then_or32(volatile kmp_uint32 *p, kmp_uint32 d) {
  kmp_uint32 old_value, new_value;

  old_value = TCR_4(*p);
  new_value = old_value | d;

  while (!KMP_COMPARE_AND_STORE_REL32((volatile kmp_int32 *)p, old_value,
                                      new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_4(*p);
    new_value = old_value | d;
  }
  return old_value;
}

kmp_uint32 __kmp_test_then_and32(volatile kmp_uint32 *p, kmp_uint32 d) {
  kmp_uint32 old_value, new_value;

  old_value = TCR_4(*p);
  new_value = old_value & d;

  while (!KMP_COMPARE_AND_STORE_REL32((volatile kmp_int32 *)p, old_value,
                                      new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_4(*p);
    new_value = old_value & d;
  }
  return old_value;
}

#if KMP_ARCH_X86 || KMP_ARCH_X86_64
kmp_int8 __kmp_test_then_add8(volatile kmp_int8 *p, kmp_int8 d) {
  kmp_int64 old_value, new_value;

  old_value = TCR_1(*p);
  new_value = old_value + d;
  while (!__kmp_compare_and_store8(p, old_value, new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_1(*p);
    new_value = old_value + d;
  }
  return old_value;
}

#if KMP_ARCH_X86
kmp_int64 __kmp_test_then_add64(volatile kmp_int64 *p, kmp_int64 d) {
  kmp_int64 old_value, new_value;

  old_value = TCR_8(*p);
  new_value = old_value + d;
  while (!__kmp_compare_and_store64(p, old_value, new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_8(*p);
    new_value = old_value + d;
  }
  return old_value;
}
#endif /* KMP_ARCH_X86 */
#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 */

kmp_uint64 __kmp_test_then_or64(volatile kmp_uint64 *p, kmp_uint64 d) {
  kmp_uint64 old_value, new_value;

  old_value = TCR_8(*p);
  new_value = old_value | d;
  while (!KMP_COMPARE_AND_STORE_REL64((volatile kmp_int64 *)p, old_value,
                                      new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_8(*p);
    new_value = old_value | d;
  }

  return old_value;
}

kmp_uint64 __kmp_test_then_and64(volatile kmp_uint64 *p, kmp_uint64 d) {
  kmp_uint64 old_value, new_value;

  old_value = TCR_8(*p);
  new_value = old_value & d;
  while (!KMP_COMPARE_AND_STORE_REL64((volatile kmp_int64 *)p, old_value,
                                      new_value)) {
    KMP_CPU_PAUSE();
    old_value = TCR_8(*p);
    new_value = old_value & d;
  }

  return old_value;
}

#if KMP_ARCH_AARCH64 && KMP_COMPILER_MSVC
// For !KMP_COMPILER_MSVC, this function is provided in assembly form
// by z_Linux_asm.S.
int __kmp_invoke_microtask(microtask_t pkfn, int gtid, int tid, int argc,
                           void *p_argv[]
#if OMPT_SUPPORT
                           ,
                           void **exit_frame_ptr
#endif
) {
#if OMPT_SUPPORT
  *exit_frame_ptr = OMPT_GET_FRAME_ADDRESS(0);
#endif

  switch (argc) {
  case 0:
    (*pkfn)(&gtid, &tid);
    break;
  case 1:
    (*pkfn)(&gtid, &tid, p_argv[0]);
    break;
  case 2:
    (*pkfn)(&gtid, &tid, p_argv[0], p_argv[1]);
    break;
  case 3:
    (*pkfn)(&gtid, &tid, p_argv[0], p_argv[1], p_argv[2]);
    break;
  case 4:
    (*pkfn)(&gtid, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3]);
    break;
  case 5:
    (*pkfn)(&gtid, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4]);
    break;
  default: {
    // p_argv[6] and onwards must be passed on the stack since 8 registers are
    // already used.
    size_t len = (argc - 6) * sizeof(void *);
    void *argbuf = alloca(len);
    memcpy(argbuf, &p_argv[6], len);
  }
    [[fallthrough]];
  case 6:
    (*pkfn)(&gtid, &tid, p_argv[0], p_argv[1], p_argv[2], p_argv[3], p_argv[4],
            p_argv[5]);
    break;
  }

#if OMPT_SUPPORT
  *exit_frame_ptr = 0;
#endif

  return 1;
}
#endif

#endif /* KMP_ARCH_X86 || KMP_ARCH_X86_64 || KMP_ARCH_AARCH64 || KMP_ARCH_ARM */
