Mercurial > hg > truffle
diff src/share/vm/runtime/globals.hpp @ 219:ab65a4c9b2e8
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
author | kvn |
---|---|
date | Mon, 23 Jun 2008 14:11:12 -0700 |
parents | 6d13fcb3663f |
children | 9c2ecc2ffb12 12eea04c8b06 fab5f738c515 |
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--- a/src/share/vm/runtime/globals.hpp Sat Jun 21 10:03:31 2008 -0700 +++ b/src/share/vm/runtime/globals.hpp Mon Jun 23 14:11:12 2008 -0700 @@ -946,6 +946,9 @@ diagnostic(bool, UseIncDec, true, \ "Use INC, DEC instructions on x86") \ \ + product(bool, UseNewLongLShift, false, \ + "Use optimized bitwise shift left") \ + \ product(bool, UseStoreImmI16, true, \ "Use store immediate 16-bits value instruction on x86") \ \