fixes 28

Author: chriselrod

src/add_compute.jl

@@ -72,7 +72,7 @@ function add_reduction_update_parent!(
     if !isloopconstant
         # and parent is not a reduction_zero
         reduct_zero = REDUCTION_ZERO[Instr]
-        reductcombine = REDUCTION_SCALAR_COMBINE[Instr].name
+        reductcombine::Symbol = @static VERSION < v"1.3" ? last(REDUCTION_SCALAR_COMBINE[Instr].args).value : REDUCTION_SCALAR_COMBINE[Instr].name
         reductsym = gensym(:reduction)
         reductinit = add_constant!(ls, Expr(:call, reduct_zero, ls.T), loopdependencies(parent), reductsym, reduct_zero, elementbytes)
         if isconstant(parent) && reduct_zero === parent.instruction.mod #we can use parent op as initialization.

src/costs.jl

@@ -1,4 +1,12 @@
 
+@static if VERSION < v"1.3"
+    lv(x) = Expr(:(.), :LoopVectorization, QuoteNode(x))
+else
+    lv(x) = GlobalRef(LoopVectorization, x)
+end
+
+
+
 struct Instruction
     mod::Symbol
     instr::Symbol
@@ -222,9 +230,9 @@ const REDUCTION_ZERO = Dict{Instruction,Symbol}(
     Instruction(:vfnmsub_fast) => :zero
 )
 
-lv(x) = GlobalRef(LoopVectorization, x)
+const LVGETPROP = @static VERSION < v"1.3" ? Expr : GlobalRef
 # Fast functions, because common pattern is
-const REDUCTION_SCALAR_COMBINE = Dict{Instruction,GlobalRef}(
+const REDUCTION_SCALAR_COMBINE = Dict{Instruction,LVGETPROP}(
     Instruction(:+) => lv(:reduced_add),
     Instruction(:vadd) => lv(:reduced_add),
     Instruction(:*) => lv(:reduced_prod),

src/lowering.jl

@@ -199,7 +199,7 @@ function reduce_range!(q::Expr, toreduct::Symbol, instr::Instruction, Uh::Int, U
         push!(q.args, Expr(:(=), tru, Expr(instr, tru, Symbol(toreduct, u + Uh))))
     end
     for u ∈ 2Uh:Uh2-1
-        tru = Symbol(toreduct, u + 1 - 2Uh)
+        tru = Symbol(toreduct, u - 2Uh)
         push!(q.args, Expr(:(=), tru, Expr(instr, tru, Symbol(toreduct, u))))
     end
 end