clamp: Turn ifelse into ternary

Fixes #54022

Co-authored-by: Klaus Crusius <[email protected]>

Author: barucden

base/math.jl

@@ -95,11 +95,10 @@ julia> clamp.([11, 8, 5], 10, 6)  # an example where lo > hi
  10
 ```
 """
-clamp(x::X, lo::L, hi::H) where {X,L,H} =
-    ifelse(x > hi, convert(promote_type(X,L,H), hi),
-           ifelse(x < lo,
-                  convert(promote_type(X,L,H), lo),
-                  convert(promote_type(X,L,H), x)))
+function clamp(x::X, lo::L, hi::H) where {X,L,H}
+    T = promote_type(X, L, H)
+    return (x < lo) ? convert(T, lo) : (x > hi) ? convert(T, hi) : x
+end
 
 """
     clamp(x, T)::T

test/math.jl

@@ -47,6 +47,9 @@ has_fma = Dict(
         clamp!(x, 1, 3)
         @test x == [1.0, 1.0, 2.0, 3.0, 3.0]
     end
+
+    @test clamp(typemax(UInt64), Int64) === typemax(Int64)
+    @test clamp(typemin(Int), UInt64) === typemin(UInt64)
 end
 
 @testset "constants" begin