hash(T(Inf)) broken with current Julia master

[jmkuhn]

julia> versioninfo()
Julia Version 1.6.0-DEV.1066
Commit b89c4a3cb5 (2020-09-28 08:12 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin18.7.0)
  CPU: Intel(R) Core(TM) i7-7567U CPU @ 3.50GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-10.0.1 (ORCJIT, skylake)

julia> hash(d32"Inf")
0x0000000000000001

julia> hash(Inf)
0x807bb202c9cbfc6f

[stevengj]

Is this a bug in DecFP, or in Julia? It works in 1.5.

[jmkuhn]

I think this is due to a change in Julia. I run the DecFP tests vs Julia master about once per week. Due to issue JuliaPackaging/BinaryBuilder.jl#913 is has been a couple weeks since I ran the tests, but this is the first time I've seen this failure. I haven't had time yet to investigate what has changed.

[jmkuhn]

Heisenbug - when run in the VSCode debugger, hash(d32"Inf") == 0x807bb202c9cbfc6f.

[jmkuhn]

git bisect indicates the first bad commit is JuliaLang/julia@9adcdd4.

[jmkuhn]

This is a Julia/LLVM bug. I have isolated a case that doesn't use DecFP. I'll write and submit a Julia issue in the morning.

Edit:
JuliaLang/julia#37800

[stevengj]

Thanks for tracking this down.

[jmkuhn]

Fixed by JuliaLang/julia#38031