add some tests

src/jlapi.c

@@ -553,9 +553,9 @@ JL_DLLEXPORT int jl_get_fenv_except(void)
  fenv_t env;
  fegetenv(&env);
 #if defined(_CPU_AARCH64_)
- return (env.__fpcr & FE_ALL_EXCEPT << 8);
+ return (env.__fpcr >> 8 & FE_ALL_EXCEPT);
 #elif defined(_CPU_X86_64_)
- return (~env.__mxcsr & FE_ALL_EXCEPT << 7);
+ return (~env.__mxcsr >> 7 & FE_ALL_EXCEPT);
 #else
  return -1;
 #endif

test/rounding.jl

@@ -5,6 +5,7 @@ using Base.MathConstants
 
 using Test
 
+
 @testset "Float64 checks" begin
  # a + b returns a number exactly between prevfloat(1.) and 1., so its
  # final result depends strongly on the utilized rounding direction.
@@ -351,3 +352,41 @@ end
  Base.Rounding.setrounding_raw(T, Base.Rounding.to_fenv(old))
  end
 end
+
+
+try
+ Base.Rounding.get_exceptions()
+ fp_exceptions = true
+catch e
+ fp_exceptions = false
+end
+
+if fp_exceptions
+
+ @testset "floating point exceptions" begin
+ @test Base.Rounding.get_exceptions() == (invalid = false, inexact = false, underflow = false, overflow = false, dividebyzero = false)
+
+ @test isnan(0/0)
+ @test 1/0 == Inf
+
+ Base.Rounding.set_exceptions(invalid=true)
+ @test Base.Rounding.get_exceptions() == (invalid = true, inexact = false, underflow = false, overflow = false, dividebyzero = false)
+
+ @test_throws InvalidFloatingPointException 0/0
+ @test 1/0 == Inf
+
+ Base.Rounding.set_exceptions(dividebyzero=true)
+ @test Base.Rounding.get_exceptions() == (invalid = true, inexact = false, underflow = false, overflow = false, dividebyzero = true)
+
+ @test_throws InvalidFloatingPointException 0/0
+ @test_throws DivideByZeroFloatingPointException 1/0
+
+ Base.Rounding.set_exceptions(invalid=false, dividebyzero=false)
+
+ @test Base.Rounding.get_exceptions() == (invalid = false, inexact = false, underflow = false, overflow = false, dividebyzero = false)
+
+ @test isnan(0/0)
+ @test 1/0 == Inf
+
+ end
+end