Author: sewardj
Date: 2008-03-09 21:09:05 +0000 (Sun, 09 Mar 2008)
New Revision: 7625
Log:
A bit of unrollery in the SVal cache writeback code. Hey, it's a
no-brainer and is worth about 1.5% on one test.
Modified:
branches/HGDEV/helgrind/hg_main.c
Modified: branches/HGDEV/helgrind/hg_main.c
===================================================================
--- branches/HGDEV/helgrind/hg_main.c 2008-03-09 20:44:20 UTC (rev 7624)
+++ branches/HGDEV/helgrind/hg_main.c 2008-03-09 21:09:05 UTC (rev 7625)
@@ -4231,10 +4231,37 @@
if (lineZ->dict[3] == 0) { lineZ->dict[3] = sv; j = 3; goto dict_ok; }
break; /* we'll have to use the f rep */
dict_ok:
- for (m = csvals[k].count; m > 0; m--) {
- write_twobit_array( lineZ->ix2s, i, j );
- i++;
+ m = csvals[k].count;
+ if (m == 8) {
+ write_twobit_array( lineZ->ix2s, i+0, j );
+ write_twobit_array( lineZ->ix2s, i+1, j );
+ write_twobit_array( lineZ->ix2s, i+2, j );
+ write_twobit_array( lineZ->ix2s, i+3, j );
+ write_twobit_array( lineZ->ix2s, i+4, j );
+ write_twobit_array( lineZ->ix2s, i+5, j );
+ write_twobit_array( lineZ->ix2s, i+6, j );
+ write_twobit_array( lineZ->ix2s, i+7, j );
+ i += 8;
}
+ else if (m == 4) {
+ write_twobit_array( lineZ->ix2s, i+0, j );
+ write_twobit_array( lineZ->ix2s, i+1, j );
+ write_twobit_array( lineZ->ix2s, i+2, j );
+ write_twobit_array( lineZ->ix2s, i+3, j );
+ i += 4;
+ }
+ else if (m == 1) {
+ write_twobit_array( lineZ->ix2s, i+0, j );
+ i += 1;
+ }
+ else if (m == 2) {
+ write_twobit_array( lineZ->ix2s, i+0, j );
+ write_twobit_array( lineZ->ix2s, i+1, j );
+ i += 2;
+ }
+ else {
+ tl_assert(0); /* 8 4 2 or 1 are the only legitimate values for m */
+ }
}
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