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authorMagnus Lång <[email protected]>2017-03-06 18:31:27 +0100
committerMagnus Lång <[email protected]>2017-03-16 20:49:42 +0100
commite7b26d9d6a36b315518cc2743eb179ccec3b7a36 (patch)
treeca66791cfb4335be31cc65c722afef7821c684e1 /lib
parentc52b2cf226cb3f1bb1b16bee28d47785506adff3 (diff)
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hipe_spillmin_color: Move coalescing
Diffstat (limited to 'lib')
-rw-r--r--lib/hipe/opt/hipe_spillmin_color.erl62
1 files changed, 51 insertions, 11 deletions
diff --git a/lib/hipe/opt/hipe_spillmin_color.erl b/lib/hipe/opt/hipe_spillmin_color.erl
index 41f1972df7..28a4f4bca5 100644
--- a/lib/hipe/opt/hipe_spillmin_color.erl
+++ b/lib/hipe/opt/hipe_spillmin_color.erl
@@ -212,16 +212,26 @@ build_ig_bb([X|Xs], LiveOut, IG, Target, TempMap, TempMapping) ->
build_ig_bb(Xs, LiveOut, IG, Target, TempMap, TempMapping),
build_ig_instr(X, Live, NewIG, Target, TempMap, TempMapping).
-build_ig_instr(X, Live, IG, Target, TempMap, TempMapping) ->
+build_ig_instr(X, Live0, IG0, Target, TempMap, TempMapping) ->
{Def, Use} = def_use(X, Target, TempMap),
- ?report3("Live ~w\n~w : Def: ~w Use ~w\n",[Live, X, Def,Use]),
+ ?report3("Live ~w\n~w : Def: ~w Use ~w\n",[Live0, X, Def,Use]),
DefListMapped = list_map(Def, TempMapping, []),
UseListMapped = list_map(Use, TempMapping, []),
DefSetMapped = ordsets:from_list(DefListMapped),
UseSetMapped = ordsets:from_list(UseListMapped),
- NewIG = interference_arcs(DefListMapped, ordsets:to_list(Live), IG),
- NewLive = ordsets:union(UseSetMapped, ordsets:subtract(Live, DefSetMapped)),
- {NewLive, NewIG}.
+ {Live1, IG1} =
+ analyze_move(X, Live0, IG0, Target, DefSetMapped, UseSetMapped),
+ IG = interference_arcs(DefListMapped, ordsets:to_list(Live1), IG1),
+ Live = ordsets:union(UseSetMapped, ordsets:subtract(Live1, DefSetMapped)),
+ {Live, IG}.
+
+analyze_move(X, Live0, IG0, Target, DefSetMapped, UseSetMapped) ->
+ case {is_spill_move(X, Target), DefSetMapped, UseSetMapped} of
+ {true, [Dst], [Src]} ->
+ {ordsets:del_element(Src, Live0), add_move(Src, Dst, IG0)};
+ {_, _, _} ->
+ {Live0, IG0}
+ end.
%% Given a list of Keys and an ets-table returns a list of the elements
%% in Mapping corresponding to the Keys and appends Acc to this list.
@@ -382,7 +392,8 @@ select_colors([{X,colorable}|Xs], IG, Cols, PhysRegs) ->
select_color(X, IG, Cols, PhysRegs) ->
UsedColors = get_colors(neighbors(X, IG), Cols),
- Reg = select_unused_color(UsedColors, PhysRegs),
+ Preferences = get_colors(move_connected(X, IG), Cols),
+ Reg = select_unused_color(UsedColors, Preferences, PhysRegs),
{Reg, set_color(X, Reg, Cols)}.
%%%%%%%%%%%%%%%%%%%%
@@ -396,10 +407,14 @@ get_colors([X|Xs], Cols) ->
[R|get_colors(Xs, Cols)]
end.
-select_unused_color(UsedColors, PhysRegs) ->
+select_unused_color(UsedColors, Preferences, PhysRegs) ->
Summary = ordsets:from_list(UsedColors),
- AvailRegs = ordsets:to_list(ordsets:subtract(PhysRegs, Summary)),
- hd(AvailRegs).
+ case ordsets:subtract(ordsets:from_list(Preferences), Summary) of
+ [PreferredColor|_] -> PreferredColor;
+ _ ->
+ AvailRegs = ordsets:to_list(ordsets:subtract(PhysRegs, Summary)),
+ hd(AvailRegs)
+ end.
push_colored(X, Stk) ->
[{X, colorable} | Stk].
@@ -456,7 +471,11 @@ init_stackslots(NumSlots, Acc) ->
%%
%% Note: later on, we may wish to add 'move-related' support.
--record(ig_info, {neighbors = [] :: [_], degree = 0 :: non_neg_integer()}).
+-record(ig_info, {
+ neighbors = [] :: [_],
+ degree = 0 :: non_neg_integer(),
+ move_connected = [] :: [_]
+ }).
empty_ig(NumNodes) ->
hipe_vectors:new(NumNodes, #ig_info{}).
@@ -467,16 +486,29 @@ degree(Info) ->
neighbors(Info) ->
Info#ig_info.neighbors.
+move_connected(Info) ->
+ Info#ig_info.move_connected.
+
add_edge(X, X, IG) -> IG;
add_edge(X, Y, IG) ->
add_arc(X, Y, add_arc(Y, X, IG)).
+add_move(X, X, IG) -> IG;
+add_move(X, Y, IG) ->
+ add_move_arc(X, Y, add_move_arc(Y, X, IG)).
+
add_arc(X, Y, IG) ->
Info = hipe_vectors:get(IG, X),
Old = neighbors(Info),
New = Info#ig_info{neighbors = [Y|Old]},
hipe_vectors:set(IG,X,New).
+add_move_arc(X, Y, IG) ->
+ Info = hipe_vectors:get(IG, X),
+ Old = move_connected(Info),
+ New = Info#ig_info{move_connected = [Y|Old]},
+ hipe_vectors:set(IG,X,New).
+
normalize_ig(IG) ->
Size = hipe_vectors:size(IG),
normalize_ig(Size-1, IG).
@@ -486,7 +518,8 @@ normalize_ig(-1, IG) ->
normalize_ig(I, IG) ->
Info = hipe_vectors:get(IG, I),
N = ordsets:from_list(neighbors(Info)),
- NewInfo = Info#ig_info{neighbors = N, degree = length(N)},
+ M = ordsets:subtract(ordsets:from_list(move_connected(Info)), N),
+ NewInfo = Info#ig_info{neighbors = N, degree = length(N), move_connected = M},
NewIG = hipe_vectors:set(IG, I, NewInfo),
normalize_ig(I-1, NewIG).
@@ -494,6 +527,10 @@ neighbors(X, IG) ->
Info = hipe_vectors:get(IG, X),
Info#ig_info.neighbors.
+move_connected(X, IG) ->
+ Info = hipe_vectors:get(IG, X),
+ Info#ig_info.move_connected.
+
decrement_degree(X, IG) ->
Info = hipe_vectors:get(IG, X),
Degree = degree(Info),
@@ -555,3 +592,6 @@ def_use(X, Target={TgtMod,TgtCtx}, TempMap) ->
reg_names(Regs, {TgtMod,TgtCtx}) ->
[TgtMod:reg_nr(X,TgtCtx) || X <- Regs].
+
+is_spill_move(Instr, {TgtMod,TgtCtx}) ->
+ TgtMod:is_spill_move(Instr, TgtCtx).