params.c (set_param_value): Initialize the "set" field.

	* params.c (set_param_value): Initialize the "set" field.
	* params.h (struct param_info): Add "set" field.
	(PARAM_SET_P): New macro.
	(PREFETCH_LATENCY, SIMULTANEOUS_PREFETCHES, L1_CACHE_SIZE,
	L1_CACHE_LINE_SIZE): New macros.
	* toplev.c (DEFPARAM): Initialize the "set" field.
	* tree-ssa-loop-prefetch.c (PREFETCH_LATENCY,
	SIMULTANEOUS_PREFETCHES): Removed.
	(PREFETCH_BLOCK): Use L1_CACHE_LINE_SIZE.
	(tree_ssa_prefetch_arrays): Dump the values of the parameters.
	* config/sparc/sparc.c: Include params.h.
	(sparc_override_options): Set SIMULTANEOUS_PREFETCHES and
	L1_CACHE_LINE_SIZE parameters.
	* config/sparc/sparc.h (PREFETCH_BLOCK, SIMULTANEOUS_PREFETCHES):
	Removed.
	* config/i386/i386.h (PREFETCH_BLOCK, SIMULTANEOUS_PREFETCHES):
	Removed.
	* config/i386/i386.c: Include params.h.
	(k8_cost): Change default value for SIMULTANEOUS_PREFETCHES.
	(override_options): Set SIMULTANEOUS_PREFETCHES and
	L1_CACHE_LINE_SIZE parameters.
	* config/sh/sh.h (SIMULTANEOUS_PREFETCHES): Removed.
	(OPTIMIZATION_OPTIONS): Set SIMULTANEOUS_PREFETCHES and
	L1_CACHE_LINE_SIZE parameters.
	* config/ia64/ia64.c (ia64_optimization_options): Set
	SIMULTANEOUS_PREFETCHES and L1_CACHE_LINE_SIZE parameters.
	* config/ia64/ia64.h (SIMULTANEOUS_PREFETCHES, PREFETCH_BLOCK):
	Removed.
	* params.def (PARAM_PREFETCH_LATENCY, PARAM_SIMULTANEOUS_PREFETCHES,
	PARAM_L1_CACHE_SIZE, PARAM_L1_CACHE_LINE_SIZE): New params.
	* doc/invoke.texi: Document new params.

From-SVN: r118728

1 files changed, 17 insertions, 15 deletions

diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c
index f34214e..41ada26 100644
--- a/gcc/tree-ssa-loop-prefetch.c
+++ b/gcc/tree-ssa-loop-prefetch.c
@@ -115,19 +115,6 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 /* Magic constants follow.  These should be replaced by machine specific
    numbers.  */
 
-/* A number that should roughly correspond to the number of instructions
-   executed before the prefetch is completed.  */
-
-#ifndef PREFETCH_LATENCY
-#define PREFETCH_LATENCY 200
-#endif
-
-/* Number of prefetches that can run at the same time.  */
-
-#ifndef SIMULTANEOUS_PREFETCHES
-#define SIMULTANEOUS_PREFETCHES 3
-#endif
-
 /* True if write can be prefetched by a read prefetch.  */
 
 #ifndef WRITE_CAN_USE_READ_PREFETCH
@@ -140,10 +127,12 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
 #define READ_CAN_USE_WRITE_PREFETCH 0
 #endif
 
-/* Cache line size.  Assumed to be a power of two.  */
+/* The size of the block loaded by a single prefetch.  Usually, this is
+   the same as cache line size (at the moment, we only consider one level
+   of cache hierarchy).  */
 
 #ifndef PREFETCH_BLOCK
-#define PREFETCH_BLOCK 32
+#define PREFETCH_BLOCK L1_CACHE_LINE_SIZE
 #endif
 
 /* Do we have a forward hardware sequential prefetching?  */
@@ -1026,6 +1015,19 @@ tree_ssa_prefetch_arrays (struct loops *loops)
       || PREFETCH_BLOCK == 0)
     return 0;
 
+  if (dump_file && (dump_flags & TDF_DETAILS))
+    {
+      fprintf (dump_file, "Prefetching parameters:\n");
+      fprintf (dump_file, "    simultaneous prefetches: %d\n",
+	       SIMULTANEOUS_PREFETCHES);
+      fprintf (dump_file, "    prefetch latency: %d\n", PREFETCH_LATENCY);
+      fprintf (dump_file, "    L1 cache size: %d (%d bytes)\n",
+	       L1_CACHE_SIZE, L1_CACHE_SIZE * L1_CACHE_LINE_SIZE);
+      fprintf (dump_file, "    L1 cache line size: %d\n", L1_CACHE_LINE_SIZE);
+      fprintf (dump_file, "    prefetch block size: %d\n", PREFETCH_BLOCK);
+      fprintf (dump_file, "\n");
+    }
+
   initialize_original_copy_tables ();
 
   if (!built_in_decls[BUILT_IN_PREFETCH])