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-rw-r--r--lib/compiler/src/beam_ssa_pre_codegen.erl8
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/compiler/src/beam_ssa_pre_codegen.erl b/lib/compiler/src/beam_ssa_pre_codegen.erl
index 9175931375..c60c6da9ea 100644
--- a/lib/compiler/src/beam_ssa_pre_codegen.erl
+++ b/lib/compiler/src/beam_ssa_pre_codegen.erl
@@ -2211,7 +2211,13 @@ linear_scan(#st{intervals=Intervals0,res=Res}=St0) ->
Free = init_free(maps:to_list(Res)),
Intervals1 = [init_interval(Int, Res) || Int <- Intervals0],
Intervals = sort(Intervals1),
- IsReserved = fun (#i{reg=Reg}) -> Reg =/= none end,
+ IsReserved = fun(#i{reg=Reg}) ->
+ case Reg of
+ none -> false;
+ {prefer,{_,_}} -> false;
+ {_,_} -> true
+ end
+ end,
{UnhandledRes,Unhandled} = partition(IsReserved, Intervals),
L = #l{unhandled_res=UnhandledRes,
unhandled_any=Unhandled,free=Free},