[v1.00] Implemented all backends for --accurate-pp

src/x86/freq/freq_avx512.c

@@ -1,5 +1,44 @@
 #include <stdio.h>
+#include <immintrin.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <sys/time.h>
+#include <time.h>
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+#include <stdint.h>
+#include "freq.h"
 
 void* compute_avx512() {
+  bool end = false;
+
+  struct timeval begin, now;
+
+  __m512 a = _mm512_set1_ps(1.5);
+  __m512 b = _mm512_set1_ps(1.2);
+  __m512 c = _mm512_set1_ps(0.0);
+
+  gettimeofday(&begin, NULL);
+  while(!end) {
+    for(uint64_t i=0; i < LOOP_ITERS; i++) {
+      c = _mm512_fmadd_ps(a, b, c);
+    }
+
+    gettimeofday(&now, NULL);
+    double elapsed = (now.tv_sec - begin.tv_sec) + ((now.tv_usec - begin.tv_usec)/1000000.0);
+    end = elapsed >= (double) MEASURE_TIME_SECONDS;
+  }
+
+  FILE* fp = fopen("/dev/null", "w");
+  if(fp == NULL) {
+    printf("fopen: %s", strerror(errno));
+  }
+  else {
+    fprintf(fp, "%f", c[0]);
+    fclose(fp);
+  }
+
   return NULL;
 }
+