test hopefully pass on non-AVX2 CPUs

Author: chriselrod

test/special.jl

@@ -441,8 +441,12 @@
     @test vpow!(r1, x, Val(0.75)) ≈ (r2 .= x .^ 0.75)
     @test vpow!(r1, x, Val(2/3)) ≈ (r2 .= x .^ (2/3))
     vpow!(r1, x, Val(0.5)); r2 .= sqrt.(x)
-    for i ∈ eachindex(x)
-      @test r1[i] ≈ r2[i] rtol = eps(r1[i])
+    if Bool(!LoopVectorization.VectorizationBase.has_feature(Val(:x86_64_avx2)))
+      for i ∈ eachindex(x)
+        @test abs(r1[i] - r2[i]) ≤ eps(r1[i])
+      end
+    else
+      @test r1 == r2
     end
     @test vpow!(r1, x, Val(1/4)) ≈ (r2 .= x .^ (1/4))
     @test vpow!(r1, x, Val(4.5)) ≈ (r2 .= x .^ 4.5)