make simd loop over ranges perform better

JuliaLang · Jul 18, 2018 · 06e7ad4 · 06e7ad4
1 parent 565bd4d
commit 06e7ad4
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/base/range.jl b/base/range.jl
@@ -498,6 +498,11 @@ length(r::OneTo) = unsafe_length(r)
 length(r::StepRangeLen) = r.len
 length(r::LinRange) = r.len
 
+# Needed to fold the `firstindex` call in SimdLoop.simd_index
+firstindex(::UnitRange) = 1
+firstindex(::StepRange) = 1
+firstindex(::LinRange) = 1
+
 function length(r::StepRange{T}) where T<:Union{Int,UInt,Int64,UInt64}
     isempty(r) && return zero(T)
     if r.step > 1