Fix docs and test for unsafe_indicies=true (#566)

Author: vchuravy

docs/src/index.md

@@ -118,7 +118,7 @@ Since this transformation can be disruptive, user can now opt out of the implici
 but users must avoid the use of `@index(Global)` and instead use their own derivation based on `@index(Group)` and `@index(Local)`.
 
 ```julia
-@kernel unsafe_indicies=false function localmem(A)
+@kernel unsafe_indicies=true function localmem(A)
     N = @uniform prod(@groupsize())
     gI = @index(Group, Linear)
     i = @index(Local, Linear)

src/KernelAbstractions.jl

@@ -87,9 +87,9 @@ macro kernel(ex...)
             else
                 error(
                     "Configuration should be of form:\n" *
-                        "* `cpu=true`\n" *
-                        "* `inbounds=false`\n" *
-                        "* `unsafe_indicies=false`\n" *
+                        "* `cpu=false`\n" *
+                        "* `inbounds=true`\n" *
+                        "* `unsafe_indicies=true`\n" *
                         "got `", ex[i], "`",
                 )
             end

src/macros.jl

@@ -10,7 +10,7 @@ function find_return(stmt)
 end
 
 # XXX: Proper errors
-function __kernel(expr, generate_cpu = true, force_inbounds = false, unsafe_indicies = true)
+function __kernel(expr, generate_cpu = true, force_inbounds = false, unsafe_indicies = false)
     def = splitdef(expr)
     name = def[:name]
     args = def[:args]
@@ -88,9 +88,10 @@ function transform_gpu!(def, constargs, force_inbounds, unsafe_indicies)
     pushfirst!(def[:args], :__ctx__)
     new_stmts = Expr[]
     body = MacroTools.flatten(def[:body])
-    stmts = body.args
     push!(new_stmts, Expr(:aliasscope))
-    push!(new_stmts, :(__active_lane__ = $__validindex(__ctx__)))
+    if !unsafe_indicies
+        push!(new_stmts, :(__active_lane__ = $__validindex(__ctx__)))
+    end
     if force_inbounds
         push!(new_stmts, Expr(:inbounds, true))
     end

test/localmem.jl

@@ -34,7 +34,7 @@ end
     end
 end
 
-@kernel unsafe_indicies = false function localmem_unsafe_indicies(A)
+@kernel unsafe_indicies = true function localmem_unsafe_indicies(A)
     N = @uniform prod(@groupsize())
     gI = @index(Group, Linear)
     i = @index(Local, Linear)