vector_executive/vector_executive.c

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <springbok.h>
#include <assert.h>
#define VECLEN 8

int main(int argc, char **argv) {

  LOG_INFO("Vector Executive");
  LOG_INFO("Built at: " __DATE__ ", " __TIME__);

  uint32_t mhartid;
  __asm__ volatile("csrr %0, mhartid" : "=r" (mhartid));
  LOG_INFO("HARTID: 0x%08x", (unsigned int)mhartid);
  uint32_t mstatus;
  __asm__ volatile("csrr %0, mstatus" : "=r" (mstatus));
  LOG_INFO("MSTATUS: 0x%08x", (unsigned int)mstatus);
  mstatus |= (1 << 9);  // Turn on vector extension
  __asm__ volatile("csrw mstatus, %0" : : "r" (mstatus));
  __asm__ volatile("csrr %0, mstatus" : "=r" (mstatus));
  LOG_INFO("MSTATUS: 0x%08x", (unsigned int)mstatus);

  // Configure vector CSRs
  __asm__ volatile("csrw vxsat, 0");
  __asm__ volatile("csrw vxrm, 0");
  __asm__ volatile("li a1, 8");
  __asm__ volatile("vsetvli t0, a1, e32, m1, tu, mu"); // 8 elements of 32 bits

  // Load vectors with data. v0: 1,2,..,8. v1: 9,10,..,16.
  uint32_t vector0[VECLEN];
  uint32_t vector1[VECLEN];
  for(int i = 0; i < VECLEN; i++) {
    vector0[i] = i + 1;
    vector1[i] = i + 1 + VECLEN;
  }

  __asm__ volatile("vle32.v  v0, (%0)" : : "r" (vector0));
  __asm__ volatile("vle32.v  v1, (%0)" : : "r" (vector1));

  uint32_t vec_mul[VECLEN];
  __asm__ volatile("vmul.vv v2, v1, v0");
  __asm__ volatile("vse32.v v2, (%0)" : : "r" (vec_mul));

  uint32_t vec_add[VECLEN];
  __asm__ volatile("vadd.vv v2, v1, v0");
  __asm__ volatile("vse32.v v2, (%0)" : : "r" (vec_add));

  for(int i = 0; i < VECLEN; i++) {
    LOG_INFO("Expected %u, %u : Actual %u, %u", vector0[i] * vector1[i], vector0[i] + vector1[i], vec_mul[i], vec_add[i]);
    assert(vector0[i] * vector1[i] == vec_mul[i]);
    assert(vector0[i] + vector1[i] == vec_add[i]);
  }
  return 0;
}