Mercurial > hg > truffle

diff src/cpu/x86/vm/globals_x86.hpp @ 7474:00af3a3a8df4

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
8005522: use fast-string instructions on x86 for zeroing Summary: use 'rep stosb' instead of 'rep stosq' when fast-string operations are available. Reviewed-by: twisti, roland
author kvn
date Thu, 03 Jan 2013 15:09:55 -0800
parents a5dd6e3ef9f3
children 12f651e29f6b
line wrap: on
line diff
--- a/src/cpu/x86/vm/globals_x86.hpp	Sun Dec 23 17:08:22 2012 +0100
+++ b/src/cpu/x86/vm/globals_x86.hpp	Thu Jan 03 15:09:55 2013 -0800
@@ -120,6 +120,9 @@
   product(bool, UseUnalignedLoadStores, false,                              \
           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
                                                                             \
+  product(bool, UseFastStosb, false,                                        \
+          "Use fast-string operation for zeroing: rep stosb")               \
+                                                                            \
   /* assembler */                                                           \
   product(bool, Use486InstrsOnly, false,                                    \
           "Use 80486 Compliant instruction subset")                         \