Test failure on nightly (1.7.0-DEV) in macOS (x64)

[kimikage]

https://github.com/JuliaMath/FixedPointNumbers.jl/runs/2242543353?check_suite_focus=true

Passed

Julia Version 1.7.0-DEV.710
Commit 3635f0473d (2021-03-15 19:28 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.6.0)
  CPU: Intel(R) Xeon(R) CPU E5-1650 v2 @ 3.50GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, ivybridge)

Failed

Julia Version 1.7.0-DEV.790
Commit 637f52b8eb (2021-03-31 21:10 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin19.5.0)
  CPU: Intel(R) Xeon(R) CPU E5-1650 v2 @ 3.50GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, ivybridge)

Float16(::N2f14): Test Failed at /Users/runner/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235
  Expression: float_err == 0
   Evaluated: Float16(0.010254) == 0
Stacktrace:
 [1] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235 [inlined]
 [2] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1228 [inlined]
 [3] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:226 [inlined]
 [4] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1153 [inlined]
 [5] top-level scope
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:219
Float16(::N1f15): Test Failed at /Users/runner/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235
  Expression: float_err == 0
   Evaluated: Float16(0.002441) == 0
Stacktrace:
 [1] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235 [inlined]
 [2] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1228 [inlined]
 [3] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:226 [inlined]
 [4] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1153 [inlined]
 [5] top-level scope
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:219
Float16(::N0f16): Test Failed at /Users/runner/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235
  Expression: float_err == 0
   Evaluated: Float16(0.000977) == 0
Stacktrace:
 [1] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:235 [inlined]
 [2] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1228 [inlined]
 [3] macro expansion
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:226 [inlined]
 [4] macro expansion
   @ /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/Test/src/Test.jl:1153 [inlined]
 [5] top-level scope
   @ ~/work/FixedPointNumbers.jl/FixedPointNumbers.jl/test/normed.jl:219

I haven't investigated the cause yet, but it's odd that it only happens on macOS. This might be a BigFloat problem.

[johnnychen94]

I can verify it locally:

julia> versioninfo()
Julia Version 1.7.0-DEV.792
Commit 80002db74c (2021-04-01 13:01 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin18.7.0)
  CPU: Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, skylake)

[kimikage]

Unfortunately, macOS workflows in GitHub Actions don't seem to be working for the past about a day. 😕

I'll wait for a while. The output of the following code may be useful for debugging.

using FixedPointNumbers
using InteractiveUtils

@code_native Float16(zero(N2f14))

@code_native Float16(0x0001 / BigFloat(16383))

N = N2f14
T = UInt16
for i = typemin(T):typemax(T)
    f_expected = Float16(i / BigFloat(FixedPointNumbers.rawone(N)))
    f_actual = Float16(reinterpret(N, i))
    f_actual === f_expected || error("$f_actual, $f_expected")
end

[kimikage]

xref: https://discourse.julialang.org/t/os-dependency-of-float16-bigfloat-on-nightly/58414