Described by Briggs here: http://www.cs.utexas.edu/users/mckinley/380C/lecs/briggs-thesis-1992.pdf In section 5.3.3
This is really easy to do, and I was seeing some speedups on Octane/encrypt&decrypt on x86
Here is the octane improvement I'm seeing on x86-64 with biased coloring: VMs tested: "og" at /Volumes/Data/WK/c/OpenSource/WebKitBuild/Release/jsc (r212666) "change" at /Volumes/Data/WK/b/OpenSource/WebKitBuild/Release/jsc (r212666) Collected 6 samples per benchmark/VM, with 6 VM invocations per benchmark. Emitted a call to gc() between sample measurements. Used 1 benchmark iteration per VM invocation for warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing. Reporting benchmark execution times with 95% confidence intervals in milliseconds. og change encrypt 0.15771+-0.00768 ^ 0.14474+-0.00282 ^ definitely 1.0896x faster decrypt 2.68519+-0.05090 ^ 2.53320+-0.02351 ^ definitely 1.0600x faster deltablue x2 0.12771+-0.00267 ? 0.12852+-0.00233 ? earley 0.25882+-0.00354 0.25845+-0.00183 boyer 4.41878+-0.07923 4.33053+-0.04241 might be 1.0204x faster navier-stokes x2 4.75288+-0.02827 4.71152+-0.02445 raytrace x2 0.72028+-0.00623 ? 0.72357+-0.00708 ? richards x2 0.08107+-0.00102 0.08041+-0.00089 splay x2 0.30133+-0.00148 ? 0.30499+-0.00803 ? might be 1.0122x slower regexp x2 16.32528+-0.64241 ? 16.40750+-0.59171 ? pdfjs x2 38.83070+-0.19678 ^ 37.81810+-0.77123 ^ definitely 1.0268x faster mandreel x2 40.81316+-0.30060 40.79690+-0.26345 gbemu x2 29.05617+-0.32384 28.81209+-0.18376 closure 0.48823+-0.01577 0.48424+-0.00613 jquery 6.52726+-0.03976 ? 6.58126+-0.08044 ? box2d x2 9.05653+-0.25556 9.01675+-0.08404 zlib x2 344.23631+-13.85333 341.80150+-10.84235 typescript x2 629.87040+-93.39338 590.49556+-5.72563 might be 1.0667x faster <geometric> 4.85133+-0.04850 4.79497+-0.02893 might be 1.0118x faster
This also look promising for ARM64.
Looks good on ARM64 too. Note: The decrypt/encrypt perf boost is from biased coloring. The box2d perf boost is from another patch I'm working on, but they're both part of my local build. Second note: the "og" build is running the Briggs allocator too. og change encrypt 0.41237+-0.00399 ^ 0.36497+-0.00194 ^ definitely 1.1299x faster decrypt 7.16539+-0.03360 ^ 6.38722+-0.02088 ^ definitely 1.1218x faster deltablue x2 0.34564+-0.00742 0.33859+-0.00931 might be 1.0208x faster earley 0.75216+-0.00744 0.74818+-0.00421 boyer 14.46409+-0.33290 14.31051+-0.19185 might be 1.0107x faster navier-stokes x2 15.03824+-0.05574 ? 15.09077+-0.06940 ? raytrace x2 2.27762+-0.06965 ? 2.35769+-0.14030 ? might be 1.0352x slower richards x2 0.22309+-0.00714 ? 0.22577+-0.00674 ? might be 1.0120x slower splay x2 1.38117+-0.10462 ? 1.44251+-0.07045 ? might be 1.0444x slower regexp x2 63.99753+-0.66312 63.72767+-0.44129 pdfjs x2 127.28638+-1.48141 126.47769+-1.81120 mandreel x2 187.97150+-8.78703 182.78586+-2.53704 might be 1.0284x faster gbemu x2 242.12910+-23.62377 ? 243.97893+-25.42121 ? closure 1.33415+-0.04978 1.31586+-0.01641 might be 1.0139x faster jquery 19.07025+-0.53929 ? 19.09152+-0.19186 ? box2d x2 51.85309+-1.85458 ^ 48.19905+-1.28055 ^ definitely 1.0758x faster zlib x2 1032.15644+-45.74028 ? 1042.08292+-25.20337 ? typescript x2 2518.30688+-46.32575 ? 2529.74344+-47.34484 ? <geometric> 17.67602+-0.16437 17.50267+-0.14981 might be 1.0099x faster
(In reply to comment #4) > Looks good on ARM64 too. > Note: The decrypt/encrypt perf boost is from biased coloring. The box2d perf > boost is from another patch I'm working on, but they're both part of my > local build. Second note: the "og" build is running the Briggs allocator too. > > og change > > > encrypt 0.41237+-0.00399 ^ 0.36497+-0.00194 ^ > definitely 1.1299x faster > decrypt 7.16539+-0.03360 ^ 6.38722+-0.02088 ^ > definitely 1.1218x faster Whoa > deltablue x2 0.34564+-0.00742 0.33859+-0.00931 > might be 1.0208x faster > earley 0.75216+-0.00744 0.74818+-0.00421 > boyer 14.46409+-0.33290 14.31051+-0.19185 > might be 1.0107x faster > navier-stokes x2 15.03824+-0.05574 ? 15.09077+-0.06940 ? > raytrace x2 2.27762+-0.06965 ? 2.35769+-0.14030 ? > might be 1.0352x slower > richards x2 0.22309+-0.00714 ? 0.22577+-0.00674 ? > might be 1.0120x slower > splay x2 1.38117+-0.10462 ? 1.44251+-0.07045 ? > might be 1.0444x slower > regexp x2 63.99753+-0.66312 63.72767+-0.44129 > pdfjs x2 127.28638+-1.48141 126.47769+-1.81120 > mandreel x2 187.97150+-8.78703 182.78586+-2.53704 > might be 1.0284x faster > gbemu x2 242.12910+-23.62377 ? 243.97893+-25.42121 ? > closure 1.33415+-0.04978 1.31586+-0.01641 > might be 1.0139x faster > jquery 19.07025+-0.53929 ? 19.09152+-0.19186 ? > box2d x2 51.85309+-1.85458 ^ 48.19905+-1.28055 ^ > definitely 1.0758x faster > zlib x2 1032.15644+-45.74028 ? 1042.08292+-25.20337 ? > typescript x2 2518.30688+-46.32575 ? 2529.74344+-47.34484 ? > > <geometric> 17.67602+-0.16437 17.50267+-0.14981 > might be 1.0099x faster
Created attachment 302377 [details] WIP Needs a changelog. I'll make sure EWS likes this patch.
Comment on attachment 302377 [details] WIP Attachment 302377 [details] did not pass mac-ews (mac): Output: http://webkit-queues.webkit.org/results/3172040 New failing tests: editing/spelling/spellcheck-async.html
Created attachment 302385 [details] Archive of layout-test-results from ews101 for mac-elcapitan The attached test failures were seen while running run-webkit-tests on the mac-ews. Bot: ews101 Port: mac-elcapitan Platform: Mac OS X 10.11.6
Created attachment 302423 [details] patch
Comment on attachment 302423 [details] patch Nice!
Comment on attachment 302423 [details] patch Clearing flags on attachment: 302423 Committed r212851: <http://trac.webkit.org/changeset/212851>
All reviewed patches have been landed. Closing bug.