trying optimize 3mm

polybench-c-4.2.1-beta/linear-algebra/kernels/3mm/3mm_optimized.c

+/**
+ * This version is stamped on May 10, 2016
+ *
+ * Contact:
+ *   Louis-Noel Pouchet <pouchet.ohio-state.edu>
+ *   Tomofumi Yuki <tomofumi.yuki.fr>
+ *
+ * Web address: http://polybench.sourceforge.net
+ */
+/* 3mm.c: this file is part of PolyBench/C */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <math.h>
+
+/* Include polybench common header. */
+#include <polybench.h>
+
+/* Include benchmark-specific header. */
+#include "3mm.h"
+
+
+/* Array initialization. */
+static
+void init_array(int ni, int nj, int nk, int nl, int nm,
+		DATA_TYPE POLYBENCH_2D(A,NI,NK,ni,nk),
+		DATA_TYPE POLYBENCH_2D(B,NK,NJ,nk,nj),
+		DATA_TYPE POLYBENCH_2D(C,NJ,NM,nj,nm),
+		DATA_TYPE POLYBENCH_2D(D,NM,NL,nm,nl))
+{
+  int i, j;
+
+  for (i = 0; i < ni; i++)
+    for (j = 0; j < nk; j++)
+      A[i][j] = (DATA_TYPE) ((i*j+1) % ni) / (5*ni);
+  for (i = 0; i < nk; i++)
+    for (j = 0; j < nj; j++)
+      B[i][j] = (DATA_TYPE) ((i*(j+1)+2) % nj) / (5*nj);
+  for (i = 0; i < nj; i++)
+    for (j = 0; j < nm; j++)
+      C[i][j] = (DATA_TYPE) (i*(j+3) % nl) / (5*nl);
+  for (i = 0; i < nm; i++)
+    for (j = 0; j < nl; j++)
+      D[i][j] = (DATA_TYPE) ((i*(j+2)+2) % nk) / (5*nk);
+}
+
+
+/* DCE code. Must scan the entire live-out data.
+   Can be used also to check the correctness of the output. */
+static
+void print_array(int ni, int nl,
+		 DATA_TYPE POLYBENCH_2D(G,NI,NL,ni,nl))
+{
+  int i, j;
+
+  POLYBENCH_DUMP_START;
+  POLYBENCH_DUMP_BEGIN("G");
+  for (i = 0; i < ni; i++)
+    for (j = 0; j < nl; j++) {
+	if ((i * ni + j) % 20 == 0) fprintf (POLYBENCH_DUMP_TARGET, "\n");
+	fprintf (POLYBENCH_DUMP_TARGET, DATA_PRINTF_MODIFIER, G[i][j]);
+    }
+  POLYBENCH_DUMP_END("G");
+  POLYBENCH_DUMP_FINISH;
+}
+
+
+/* Main computational kernel. The whole function will be timed,
+   including the call and return. */
+static
+void kernel_3mm(int ni, int nj, int nk, int nl, int nm,
+		DATA_TYPE POLYBENCH_2D(E,NI,NJ,ni,nj),
+		DATA_TYPE POLYBENCH_2D(A,NI,NK,ni,nk),
+		DATA_TYPE POLYBENCH_2D(B,NK,NJ,nk,nj),
+		DATA_TYPE POLYBENCH_2D(F,NJ,NL,nj,nl),
+		DATA_TYPE POLYBENCH_2D(C,NJ,NM,nj,nm),
+		DATA_TYPE POLYBENCH_2D(D,NM,NL,nm,nl),
+		DATA_TYPE POLYBENCH_2D(G,NI,NL,ni,nl))
+{
+  int i, j, k;
+
+#pragma scop
+  /* F := C*D */
+  for (i = 0; i < _PB_NJ; i++)
+    for (j = 0; j < _PB_NL; j++)
+    	F[i][j] = SCALAR_VAL(0.0);
+
+  for (i = 0; i < _PB_NJ; i++)
+    for (k = 0; k < _PB_NM; ++k)
+      for (j = 0; j < _PB_NL; j++)
+        F[i][j] += C[i][k] * D[k][j];
+
+  /* E := A*B */  
+  /* G := E*F */
+  for (i = 0; i < _PB_NI; i++){
+    for (j = 0; j < _PB_NJ; j++)
+    	E[i][j] = SCALAR_VAL(0.0);
+    for (j = 0; j < _PB_NL; j++)
+	    G[i][j] = SCALAR_VAL(0.0);
+  }
+
+  for (i = 0; i < _PB_NI; i++){
+    for (k = 0; k < _PB_NK; ++k)
+      for (j = 0; j < _PB_NJ; j++)
+        E[i][j] += A[i][k] * B[k][j];
+    for (k = 0; k < _PB_NJ; ++k)
+      for (j = 0; j < _PB_NL; j++)
+        G[i][j] += E[i][k] * F[k][j];
+  }
+#pragma endscop
+
+}
+
+
+int main(int argc, char** argv)
+{
+  /* Retrieve problem size. */
+  int ni = NI;
+  int nj = NJ;
+  int nk = NK;
+  int nl = NL;
+  int nm = NM;
+
+  /* Variable declaration/allocation. */
+  POLYBENCH_2D_ARRAY_DECL(E, DATA_TYPE, NI, NJ, ni, nj);
+  POLYBENCH_2D_ARRAY_DECL(A, DATA_TYPE, NI, NK, ni, nk);
+  POLYBENCH_2D_ARRAY_DECL(B, DATA_TYPE, NK, NJ, nk, nj);
+  POLYBENCH_2D_ARRAY_DECL(F, DATA_TYPE, NJ, NL, nj, nl);
+  POLYBENCH_2D_ARRAY_DECL(C, DATA_TYPE, NJ, NM, nj, nm);
+  POLYBENCH_2D_ARRAY_DECL(D, DATA_TYPE, NM, NL, nm, nl);
+  POLYBENCH_2D_ARRAY_DECL(G, DATA_TYPE, NI, NL, ni, nl);
+
+  /* Initialize array(s). */
+  init_array (ni, nj, nk, nl, nm,
+	      POLYBENCH_ARRAY(A),
+	      POLYBENCH_ARRAY(B),
+	      POLYBENCH_ARRAY(C),
+	      POLYBENCH_ARRAY(D));
+
+  /* Start timer. */
+  polybench_start_instruments;
+
+  /* Run kernel. */
+  kernel_3mm (ni, nj, nk, nl, nm,
+	      POLYBENCH_ARRAY(E),
+	      POLYBENCH_ARRAY(A),
+	      POLYBENCH_ARRAY(B),
+	      POLYBENCH_ARRAY(F),
+	      POLYBENCH_ARRAY(C),
+	      POLYBENCH_ARRAY(D),
+	      POLYBENCH_ARRAY(G));
+
+  /* Stop and print timer. */
+  polybench_stop_instruments;
+  polybench_print_instruments;
+
+  /* Prevent dead-code elimination. All live-out data must be printed
+     by the function call in argument. */
+  polybench_prevent_dce(print_array(ni, nl,  POLYBENCH_ARRAY(G)));
+
+  /* Be clean. */
+  POLYBENCH_FREE_ARRAY(E);
+  POLYBENCH_FREE_ARRAY(A);
+  POLYBENCH_FREE_ARRAY(B);
+  POLYBENCH_FREE_ARRAY(F);
+  POLYBENCH_FREE_ARRAY(C);
+  POLYBENCH_FREE_ARRAY(D);
+  POLYBENCH_FREE_ARRAY(G);
+
+  return 0;
+}