Halve the size of the fast tt lookup cache. This improves ppc32

performance quite a bit, since the cache is emptied quite often on
ppc32, and a smaller cache is less intrusive in the real machine's L2
cache.  On x86 the change doesn't seem to have much effect.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4947

diff --git a/coregrind/pub_core_transtab_asm.h b/coregrind/pub_core_transtab_asm.h
index 60be732666b91382b7664dd812eff9c8dc11e464..6041dcda3989f1dd07f66719aa696260d2db5847 100644 (file)
--- a/coregrind/pub_core_transtab_asm.h
+++ b/coregrind/pub_core_transtab_asm.h
@@ -32,7 +32,7 @@
 #define __PUB_CORE_TRANSTAB_ASM_H
 
 /* Constants for the fast translation lookup cache. */
-#define VG_TT_FAST_BITS 16
+#define VG_TT_FAST_BITS 15
 #define VG_TT_FAST_SIZE (1 << VG_TT_FAST_BITS)
 #define VG_TT_FAST_MASK ((VG_TT_FAST_SIZE) - 1)