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// #################################################################################################

// # << NEORV32 - RISC-V Bit-Manipulation 'B' Extension Test Program >>                            #

// # ********************************************************************************************* #

// # BSD 3-Clause License                                                                          #

// #                                                                                               #

// # Copyright (c) 2021, Stephan Nolting. All rights reserved.                                     #

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// # The NEORV32 Processor - https://github.com/stnolting/neorv32              (c) Stephan Nolting #

// #################################################################################################

/**********************************************************************//**

 * @file bitmanip_test/main.c

 * @author Stephan Nolting

 * @brief Test program for the NEORV32 'B` extension using pseudo-random

 * data as input; compares results from hardware against pure-sw reference functions.

 **************************************************************************/

#include <neorv32.h>

#include "neorv32_b_extension_intrinsics.h"

/**********************************************************************//**

 * @name User configuration

 **************************************************************************/

/**@{*/

/** UART BAUD rate */

#define BAUD_RATE      (19200)

//** Number of test cases for each instruction */

#define NUM_TEST_CASES (1000000)

/**@}*/

// Prototypes

uint32_t xorshift32(void);

uint32_t check_result(uint32_t num, uint32_t opa, uint32_t opb, uint32_t ref, uint32_t res);

void print_report(int num_err, int num_tests);

/**********************************************************************//**

 * Main function; test all available operations of the NEORV32 'Zbb' extensions

 * using bit manipulation intrinsics and software-only reference functions (emulation).

 *

 * @note This program requires the bit-manipulation CPU extension.

 *

 * @return Irrelevant.

 **************************************************************************/

int main() {

  uint32_t opa = 0, opb = 0, res_hw = 0, res_sw = 0;

  uint32_t i = 0, err_cnt = 0;

  const uint32_t num_tests = (int)NUM_TEST_CASES;

  // capture all exceptions and give debug info via UART

  neorv32_rte_setup();

  // init UART at default baud rate, no parity bits, ho hw flow control

  neorv32_uart0_setup(BAUD_RATE, PARITY_NONE, FLOW_CONTROL_NONE);

// Disable compilation by default

#ifndef RUN_CHECK

  #warning Program HAS NOT BEEN COMPILED! Use >>make USER_FLAGS+=-DRUN_CHECK clean_all exe<< to compile it.

  // inform the user if you are actually executing this

  neorv32_uart0_printf("ERROR! Program has not been compiled. Use >>make USER_FLAGS+=-DRUN_CHECK clean_all exe<< to compile it.\n");

  return 1;

#endif

  // intro

  neorv32_uart0_printf("NEORV32 Bit-Manipulation Extension Test (Zba, Zbb)\n\n");

  // check available hardware extensions and compare with compiler flags

  neorv32_rte_check_isa(0); // silent = 0 -> show message if isa mismatch

  // check if Zbb extension is implemented at all

  if ((neorv32_cpu_csr_read(CSR_MISA) & (1<<CSR_MISA_B)) == 0) {

    neorv32_uart0_print("Error! <B> extension not synthesized!\n");

    return 1;

  }

  neorv32_uart0_printf("Starting bit-manipulation extension tests (%i test cases per instruction)...\n\n", num_tests);

  neorv32_uart0_printf("-----------------------------------------\n");

  neorv32_uart0_printf("Zbb - Basic bit-manipulation instructions\n");

  neorv32_uart0_printf("-----------------------------------------\n");

  // ANDN

  neorv32_uart0_printf("\nANDN:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_andn(opa, opb);

    res_hw = riscv_intrinsic_andn(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // ORN

  neorv32_uart0_printf("\nORN:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_orn(opa, opb);

    res_hw = riscv_intrinsic_orn(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // XNOR

  neorv32_uart0_printf("\nXNOR:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_xnor(opa, opb);

    res_hw = riscv_intrinsic_xnor(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // CLZ

  neorv32_uart0_printf("\nCLZ:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_clz(opa);

    res_hw = riscv_intrinsic_clz(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // CTZ

  neorv32_uart0_printf("\nCTZ:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_ctz(opa);

    res_hw = riscv_intrinsic_ctz(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // CPOP

  neorv32_uart0_printf("\nCPOP:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_cpop(opa);

    res_hw = riscv_intrinsic_cpop(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // MAX

  neorv32_uart0_printf("\nMAX:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_max(opa, opb);

    res_hw = riscv_intrinsic_max(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // MAXU

  neorv32_uart0_printf("\nMAXU:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_maxu(opa, opb);

    res_hw = riscv_intrinsic_maxu(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // MIN

  neorv32_uart0_printf("\nMIN:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_min(opa, opb);

    res_hw = riscv_intrinsic_min(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // MINU

  neorv32_uart0_printf("\nMINU:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_minu(opa, opb);

    res_hw = riscv_intrinsic_minu(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // SEXT.B

  neorv32_uart0_printf("\nSEXT.B:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_sextb(opa);

    res_hw = riscv_intrinsic_sextb(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // SEXT.H

  neorv32_uart0_printf("\nSEXT.H:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_sexth(opa);

    res_hw = riscv_intrinsic_sexth(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // ZEXT.H

  neorv32_uart0_printf("\nZEXT.H:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_zexth(opa);

    res_hw = riscv_intrinsic_zexth(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // ROL

  neorv32_uart0_printf("\nROL:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_rol(opa, opb);

    res_hw = riscv_intrinsic_rol(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // ROR

  neorv32_uart0_printf("\nROR:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_ror(opa, opb);

    res_hw = riscv_intrinsic_ror(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // RORI

  neorv32_uart0_printf("\nRORI (imm=20):\n"); // FIXME: static immediate

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_ror(opa, 20);

    res_hw = riscv_intrinsic_rori20(opa);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // ORC.B

  neorv32_uart0_printf("\nORCB:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_orcb(opa);

    res_hw = riscv_intrinsic_orcb(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // REV8

  neorv32_uart0_printf("\nREV8:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_rev8(opa);

    res_hw = riscv_intrinsic_rev8(opa);

    err_cnt += check_result(i, opa, 0, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  neorv32_uart0_printf("\n\n");

  neorv32_uart0_printf("-----------------------------------------\n");

  neorv32_uart0_printf("Zba - Address generation instructions\n");

  neorv32_uart0_printf("-----------------------------------------\n");

  // SH1ADD

  neorv32_uart0_printf("\nSH1ADD:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_sh1add(opa, opb);

    res_hw = riscv_intrinsic_sh1add(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // SH2ADD

  neorv32_uart0_printf("\nSH2ADD:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    opb = xorshift32();

    res_sw = riscv_emulate_sh2add(opa, opb);

    res_hw = riscv_intrinsic_sh2add(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  // SH2ADD

  neorv32_uart0_printf("\nSH3ADD:\n");

  err_cnt = 0;

  for (i=0;i<num_tests; i++) {

    opa = xorshift32();

    res_sw = riscv_emulate_sh3add(opa, opb);

    res_hw = riscv_intrinsic_sh3add(opa, opb);

    err_cnt += check_result(i, opa, opb, res_sw, res_hw);

  }

  print_report(err_cnt, num_tests);

  neorv32_uart0_printf("\nBit manipulation extension tests done.\n");

  return 0;

}

/**********************************************************************//**

 * Pseudo-Random Number Generator (to generate test vectors).

 *

 * @return Random data (32-bit).

 **************************************************************************/

uint32_t xorshift32(void) {

  static uint32_t x32 = 314159265;

  x32 ^= x32 << 13;

  x32 ^= x32 >> 17;

  x32 ^= x32 << 5;

  return x32;

}

/**********************************************************************//**

 * Check results (reference (SW) vs actual hardware).

 *

 * @param[in] num Test case number

 * @param[in] opa Operand 1

 * @param[in] opb Operand 2

 * @param[in] ref Software reference

 * @param[in] res Actual results

 * @return zero if results are equal.

 **************************************************************************/

uint32_t check_result(uint32_t num, uint32_t opa, uint32_t opb, uint32_t ref, uint32_t res) {

  if (ref != res) {

    neorv32_uart0_printf("%u: opa = 0x%x, opb = 0x%x : ref = 0x%x vs res = 0x%x ", num, opa, opb, ref, res);

    neorv32_uart0_printf("%c[1m[FAILED]%c[0m\n", 27, 27);

    return 1;

  }

  else {

    return 0;

  }

}

/**********************************************************************//**

 * Print test report.

 *

 * @param[in] num_err Number or errors in this test.

 * @param[in] num_tests Total number of conducted tests.

 **************************************************************************/

void print_report(int num_err, int num_tests) {

  neorv32_uart0_printf("Errors: %i/%i ", num_err, num_tests);

  if (num_err == 0) {

    neorv32_uart0_printf("%c[1m[ok]%c[0m\n", 27, 27);

  }

  else {

    neorv32_uart0_printf("%c[1m[FAILED]%c[0m\n", 27, 27);

  }

}