Change name of rsqrt function and add doc string

Author: yashrajgupta

src/IntervalArithmetic.jl

@@ -62,7 +62,7 @@ export
     midpoint_radius, interval_from_midpoint_radius,
     RoundTiesToEven, RoundTiesToAway,
     cancelminus, cancelplus, isunbounded,
-    .., @I_str, ±, rsqrt,
+    .., @I_str, ±, reciprocal_sqrt,
     pow, extended_div,
     setformat, @format
 

src/intervals/functions.jl

@@ -306,7 +306,8 @@ for f in (:log, :log2, :log10, :log1p)
         end
 end
 
-function rsqrt(a::Interval{T}) where T
+#computes the reciprocal of square root of an Interval
+function reciprocal_sqrt(a::Interval{T}) where T
     x = sqrt(a)
     isempty(x) && return emptyinterval(x)
     x.lo == zero(T) < x.hi && return @round(inv(x.hi), T(Inf))

test/ITF1788_tests/libieeep1788_tests_elem.jl

@@ -996,17 +996,17 @@ end
 end
 
 @testset "minimal_rsqrt_test" begin
-    @test rsqrt(∅) == ∅
-    @test rsqrt(Interval(-Inf, Inf)) == 0 .. Inf
-    @test rsqrt(Interval(-Inf, -0x0.0000000000001p-1022)) == ∅
-    @test rsqrt(Interval(-1.0, 1.0)) == 1.0 .. Inf
-    @test rsqrt(Interval(0.0, 1.0)) == 1.0 .. Inf
-    @test rsqrt(Interval(-0.0, 1.0)) == 1.0 .. Inf
-    @test rsqrt(Interval(-5.0, 25.0)) == 0.2 .. Inf
-    @test rsqrt(Interval(0.0, 25.0)) == 0.2 .. Inf
-    @test rsqrt(Interval(-0.0, 25.0)) == 0.2 .. Inf
-    @test rsqrt(Interval(-5.0, Inf)) == 0.0 .. Inf
-    @test rsqrt(Interval(4.0, 25.0)) == 0.2 .. 0.5
+    @test reciprocal_sqrt(∅) == ∅
+    @test reciprocal_sqrt(Interval(-Inf, Inf)) == 0 .. Inf
+    @test reciprocal_sqrt(Interval(-Inf, -0x0.0000000000001p-1022)) == ∅
+    @test reciprocal_sqrt(Interval(-1.0, 1.0)) == 1.0 .. Inf
+    @test reciprocal_sqrt(Interval(0.0, 1.0)) == 1.0 .. Inf
+    @test reciprocal_sqrt(Interval(-0.0, 1.0)) == 1.0 .. Inf
+    @test reciprocal_sqrt(Interval(-5.0, 25.0)) == 0.2 .. Inf
+    @test reciprocal_sqrt(Interval(0.0, 25.0)) == 0.2 .. Inf
+    @test reciprocal_sqrt(Interval(-0.0, 25.0)) == 0.2 .. Inf
+    @test reciprocal_sqrt(Interval(-5.0, Inf)) == 0.0 .. Inf
+    @test reciprocal_sqrt(Interval(4.0, 25.0)) == 0.2 .. 0.5
 end
 
 @testset "minimal_fma_test" begin