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core.internal.hash.bytesHash: in 64-bit builds use a 64-bit-oriented algorithm #3148
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Thanks for your pull request, @n8sh! Bugzilla references
Testing this PR locallyIf you don't have a local development environment setup, you can use Digger to test this PR: dub run digger -- build "master + druntime#3148" |
n8sh
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Test runnable/testaa2.d failed:
expected:
----
foo()
foo() 2
foo() 3
foo() 4
c["foo"] = 3
c["bar"] = 4
Success
----
actual:
----
foo()
foo() 2
foo() 3
foo() 4
c["bar"] = 4
c["foo"] = 3
SuccessA DMD test is failing because it depends on a specific AA traversal order. I am inclined to consider that erroneous based on https://dlang.org/spec/hash-map.html:
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Indeed. This test should be fixed. |
This was referenced Jul 2, 2020
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Please add a reference for this hash algorithm in a comment |
src/core/internal/hash.d
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| version (BigEndian) | ||
| { | ||
| auto k1 = | ||
| ((cast(ulong) data[0]) << 56) | | ||
| ((cast(ulong) data[1]) << 48) | | ||
| ((cast(ulong) data[2]) << 40) | | ||
| ((cast(ulong) data[3]) << 32) | | ||
| ((cast(ulong) data[4]) << 24) | | ||
| ((cast(ulong) data[5]) << 16) | | ||
| ((cast(ulong) data[6]) << 8) | | ||
| (cast(ulong) data[7]); | ||
| } |
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Couldn't this use the pointer read optimization as done for the 32 bit hash above?
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…a 64-bit-oriented algorithm
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Motivation: doesn't discard high 32 bits of seed; produces 64 bits of output; and is a bit faster.