Add more subnormals and test log2 and log10

Cthulhoni · Feb 7, 2021 · b51f4cc · b51f4cc
1 parent fbbabdd
commit b51f4cc
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/test/math.jl b/test/math.jl
@@ -680,9 +680,13 @@ end
     end
     @testset "log of subnormals" begin
         # checked results with WolframAlpha
-        for (T, ex, res) in ((Float32, -128, -88.72284f0),
-                             (Float64, -1024, -709.782712893384))
-            @test log(T(2)^ex) ≈ res
+        for (T, lr) in ((Float32, LinRange(2.f0^(-129), 2.f0^(-128), 1000)),
+                        (Float64, LinRange(2.0^(-1025), 2.0^(-1024), 1000)))
+            for x in lr
+                @test log(x)   ≈ T(log(widen(x))) rtol=2eps(T)
+                @test log2(x)  ≈ T(log2(widen(x))) rtol=2eps(T)
+                @test log10(x) ≈ T(log10(widen(x))) rtol=2eps(T)
+            end
         end
     end
 end