// Copyright 2023 Google LLC
//
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree.

#include <assert.h>
#include <stddef.h>

#ifdef _WIN32
  #include <windows.h>
#else
  #include <pthread.h>
#endif

#include <xnnpack/common.h>
#include <xnnpack/config.h>
#include <xnnpack/pad.h>


static struct xnn_xx_pad_config xx_pad_config = {0};

#if XNN_PLATFORM_WINDOWS
  static INIT_ONCE init_guard = INIT_ONCE_STATIC_INIT;
#else
  static pthread_once_t init_guard = PTHREAD_ONCE_INIT;
#endif

static void init_xx_pad_config(void) {
  #if XNN_ARCH_ARM
    const struct xnn_hardware_config* hardware_config = xnn_init_hardware_config();
    assert(hardware_config != NULL);
    if (hardware_config->use_arm_neon) {
      xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__neon;
      xx_pad_config.row_tile = 1;
    } else if (!XNN_PLATFORM_MOBILE) {
      xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__scalar;
      xx_pad_config.row_tile = 1;
    }
  #elif XNN_ARCH_ARM64
    xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__neon;
    xx_pad_config.row_tile = 1;
  #elif XNN_ARCH_X86 || XNN_ARCH_X86_64
    xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__sse2;
    xx_pad_config.row_tile = 1;
  #elif XNN_ARCH_WASMSIMD || XNN_ARCH_WASMRELAXEDSIMD
    xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__wasmsimd;
    xx_pad_config.row_tile = 1;
  #elif XNN_ARCH_WASM
    xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__scalar;
    xx_pad_config.row_tile = 1;
  #elif XNN_ARCH_RISCV
    xx_pad_config.ukernel = (xnn_pad_ukernel_fn) xnn_xx_pad_ukernel__scalar;
    xx_pad_config.row_tile = 1;
  #else
    #error "Unsupported architecture"
  #endif
}

#if XNN_PLATFORM_WINDOWS
  static BOOL CALLBACK init_xx_pad_config_windows(PINIT_ONCE init_once, PVOID parameter, PVOID* context) {
    init_xx_pad_config();
    return TRUE;
  }
#endif

const struct xnn_xx_pad_config* xnn_init_xx_pad_config() {
  const struct xnn_hardware_config* hardware_config = xnn_init_hardware_config();
  if (hardware_config == NULL) {
    return NULL;
  }
  #if XNN_PLATFORM_WINDOWS
    InitOnceExecuteOnce(&init_guard, &init_xx_pad_config_windows, NULL, NULL);
  #else
    pthread_once(&init_guard, &init_xx_pad_config);
  #endif
  return &xx_pad_config;
}