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frog/dartc: string hashing should use limited range arithmetic #1050

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rakudrama opened this issue Jan 5, 2012 · 4 comments
Closed

frog/dartc: string hashing should use limited range arithmetic #1050

rakudrama opened this issue Jan 5, 2012 · 4 comments
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area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant

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@rakudrama
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It is helpful to ensure that intermediate values in hashing are kept within the implementation's small integer range.

From http://jsperf.com/hashcode-string-x/2 I would pick the 'b29' implementation as it is the best or tied-best on all browsers.
@floitschG
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Alternatively we could future-proof our hashcode algorithm and base it on something like cityhash or SpookyHash. In the short-run it would be less efficient but eventually these would probably give the best performance.

@lrhn
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lrhn commented Jun 4, 2013

Both frog and dartc are pretty much dead by now.
Is this something we still care about?

cc @rakudrama.
cc @floitschG.
Added NeedsInfo label.

@floitschG
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The dart2js implementation uses limited bit-arithmetic now.
We still need to figure out how to spec hashCode so that we have ways to go to cityhash/spookyhash eventually.

@floitschG
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Added AssumedStale label.

@rakudrama rakudrama added Type-Defect area-core-library SDK core library issues (core, async, ...); use area-vm or area-web for platform specific libraries. closed-obsolete Closed as the reported issue is no longer relevant labels Jun 6, 2013
dart-bot pushed a commit that referenced this issue Apr 7, 2021
@athomas
[co19] Roll co19 to 812ab751c41fe8d706fd1e4aae62d2dea2887ac2
4a6a92e 
2021-04-07 [email protected] Fixes #535: more nnbd tests for constant evaluation added.
2021-04-07 [email protected] Fixes #1068. Remove excessive - in a SharedOptions
2021-04-05 [email protected] Fixes #535: more nnbd tests for constant evaluation added.
2021-04-05 [email protected] Fixes #996: more tests added.
2021-04-05 [email protected] Fixes #996: more tests added.
2021-04-05 [email protected] Fixes #1067: added checks for old and new dart versions.
2021-04-05 [email protected] Fixes #1066: added @Dart=2.12 to the initial version of the test, new test which checks recent dart behavior added.
2021-04-05 [email protected] Fixes #1057: Expected result doe the tests with mailformed types updated.
2021-04-02 [email protected] Fixes #1062. Remove unnecessary assignment
2021-04-01 [email protected] Fixes #1057: Expected result doe the tests with mailformed types updated.
2021-04-01 [email protected] Expected error code is fixed for Windows
2021-04-01 [email protected] Fixes #1060. Expected error message position updated
2021-04-01 [email protected] Fixes #1059. Expected error message updated
2021-04-01 [email protected] Fixes #1024. Adjust expected results for web platforms
2021-04-01 [email protected] #993. More Array tests added
2021-03-31 [email protected] Update LICENSE
2021-03-31 [email protected] #993. Array tests added
2021-03-31 [email protected] Issue #1053: Missing Issue tag added, test expectation updated.
2021-03-30 [email protected] Fixes #1054: Updated expectations for mailformed raw type variables.
2021-03-30 [email protected] Fixes #1050: Updated expectations for mailformed raw type variables.
2021-03-30 [email protected] Fixes #1050: Got rid of mailformed row type variable usage in i-2-b- tests.
2021-03-29 [email protected] Fixes #1043. Remove static warning as an expected result
2021-03-29 [email protected] Fixes #1049: Correct expectation adjusted
2021-03-29 [email protected] Fixes #1048. Move tests to correct folder and change the description
2021-03-29 [email protected] Fixes #1046: Test adjusted to work with the generic metadata feature enabled.
2021-03-29 [email protected] Fixes #1047. Change expected result to not to fail on JavaScript configurations
2021-03-29 [email protected] Fixes #1044. Change expected result to not to fail on JavaScript configurations
2021-03-26 [email protected] Fixes #1029: Missing Issue tag added to the test.
2021-03-26 [email protected] Fixes #1042. Add check that produces different results for triple and double shifts
2021-03-26 [email protected] Fixes #1042. Fix built-in_types_t11.dart to expect correct results
2021-03-25 [email protected] Fixes #1019. Don't use type aliases in legacy libraries
2021-03-25 [email protected] Fixes #1039: Old-style aliases corrected.
2021-03-25 [email protected] Fixes #988. Expect static type warning in a right way
2021-03-24 [email protected] Issues #1029: Static expectation corrected.
2021-03-24 [email protected] Issues #1035: Issue tag for the bug 45443 added.
2021-03-24 [email protected] Merge branch 'master' of https://github.com/dart-lang/co19
2021-03-24 [email protected] #1023. Change SplayTreeMap and SplayTreeSet tests according to the new behavior
2021-03-23 [email protected] #1021. Remove expecting errors on web configurations for some negative numbers
2021-03-23 [email protected] Fixes #1034. Missed experimental flag added
2021-03-23 [email protected] #1033. Perform runtime check on big values for non-JavaScript configurations only
2021-03-23 [email protected] Issues #1029: co19/Language/Generics/Superbounded_types/typedef3_A01_t06/02 corrected and does not expect a compile error now.

Cq-Include-Trybots: dart/try:analyzer-nnbd-linux-release-try,dart2js-nnbd-linux-x64-chrome-try,ddc-nnbd-linux-release-chrome-try,front-end-nnbd-linux-release-x64-try,vm-kernel-nnbd-linux-debug-x64-try,vm-kernel-nnbd-linux-release-simarm64-try,vm-kernel-nnbd-linux-release-x64-try,vm-kernel-nnbd-mac-release-x64-try,vm-kernel-nnbd-win-release-x64-try,vm-kernel-precomp-nnbd-linux-debug-x64-try,vm-kernel-precomp-nnbd-linux-release-simarm64-try,vm-kernel-precomp-nnbd-linux-release-x64-try
Change-Id: I5fae01c7b48aba502da04638430f4f6de79ac745
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/194241
Reviewed-by: William Hesse <[email protected]>
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@rakudrama @lrhn @floitschG