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-rw-r--r--lib/hipe/rtl/hipe_rtl.erl102
1 files changed, 37 insertions, 65 deletions
diff --git a/lib/hipe/rtl/hipe_rtl.erl b/lib/hipe/rtl/hipe_rtl.erl
index 0726827299..04c9728d5c 100644
--- a/lib/hipe/rtl/hipe_rtl.erl
+++ b/lib/hipe/rtl/hipe_rtl.erl
@@ -1,9 +1,5 @@
%% -*- erlang-indent-level: 2 -*-
%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 2001-2016. All Rights Reserved.
-%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
@@ -15,8 +11,6 @@
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
-%%
-%% %CopyrightEnd%
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% @doc
@@ -187,18 +181,14 @@
mk_branch/5,
mk_branch/6,
- branch_src1/1,
- branch_src2/1,
- branch_cond/1,
- branch_true_label/1,
- branch_false_label/1,
- branch_pred/1,
+ mk_branch/7,
%% is_branch/1,
%% branch_true_label_update/2,
%% branch_false_label_update/2,
mk_alub/7,
mk_alub/8,
+ alub_has_dst/1,
alub_dst/1,
alub_src1/1,
alub_op/1,
@@ -338,6 +328,7 @@
defines/1,
redirect_jmp/3,
is_safe/1,
+ reduce_unused/1,
%% highest_var/1,
pp/1,
pp/2,
@@ -588,37 +579,25 @@ is_label(#label{}) -> true;
is_label(_) -> false.
%%
-%% branch
-%%
-
-mk_branch(Src1, Op, Src2, True, False) ->
- mk_branch(Src1, Op, Src2, True, False, 0.5).
-mk_branch(Src1, Op, Src2, True, False, P) ->
- #branch{src1=Src1, 'cond'=Op, src2=Src2, true_label=True,
- false_label=False, p=P}.
-branch_src1(#branch{src1=Src1}) -> Src1.
-branch_src1_update(Br, NewSrc) -> Br#branch{src1=NewSrc}.
-branch_src2(#branch{src2=Src2}) -> Src2.
-branch_src2_update(Br, NewSrc) -> Br#branch{src2=NewSrc}.
-branch_cond(#branch{'cond'=Cond}) -> Cond.
-branch_true_label(#branch{true_label=TrueLbl}) -> TrueLbl.
-branch_true_label_update(Br, NewTrue) -> Br#branch{true_label=NewTrue}.
-branch_false_label(#branch{false_label=FalseLbl}) -> FalseLbl.
-branch_false_label_update(Br, NewFalse) -> Br#branch{false_label=NewFalse}.
-branch_pred(#branch{p=P}) -> P.
-
-%%
%% alub
%%
-type alub_cond() :: 'eq' | 'ne' | 'ge' | 'geu' | 'gt' | 'gtu' | 'le'
| 'leu' | 'lt' | 'ltu' | 'overflow' | 'not_overflow'.
+mk_branch(Src1, Cond, Src2, True, False) ->
+ mk_branch(Src1, Cond, Src2, True, False, 0.5).
+mk_branch(Src1, Cond, Src2, True, False, P) ->
+ mk_branch(Src1, 'sub', Src2, Cond, True, False, P).
+mk_branch(Src1, Op, Src2, Cond, True, False, P) ->
+ mk_alub([], Src1, Op, Src2, Cond, True, False, P).
+
mk_alub(Dst, Src1, Op, Src2, Cond, True, False) ->
mk_alub(Dst, Src1, Op, Src2, Cond, True, False, 0.5).
mk_alub(Dst, Src1, Op, Src2, Cond, True, False, P) ->
#alub{dst=Dst, src1=Src1, op=Op, src2=Src2, 'cond'=Cond,
true_label=True, false_label=False, p=P}.
+alub_has_dst(#alub{dst=Dst}) -> Dst =/= [].
alub_dst(#alub{dst=Dst}) -> Dst.
alub_dst_update(A, NewDst) -> A#alub{dst=NewDst}.
alub_src1(#alub{src1=Src1}) -> Src1.
@@ -943,8 +922,7 @@ args(I) ->
case I of
#alu{} -> [alu_src1(I), alu_src2(I)];
#alub{} -> [alub_src1(I), alub_src2(I)];
- #branch{} -> [branch_src1(I), branch_src2(I)];
- #call{} ->
+ #call{} ->
Args = call_arglist(I) ++ hipe_rtl_arch:call_used(),
case call_is_known(I) of
false -> [call_fun(I) | Args];
@@ -987,8 +965,8 @@ args(I) ->
defines(Instr) ->
Defs = case Instr of
#alu{} -> [alu_dst(Instr)];
+ #alub{dst=[]} -> [];
#alub{} -> [alub_dst(Instr)];
- #branch{} -> [];
#call{} -> call_dstlist(Instr) ++ hipe_rtl_arch:call_defined();
#comment{} -> [];
#enter{} -> [];
@@ -1042,9 +1020,6 @@ subst_uses(Subst, I) ->
#alub{} ->
I0 = alub_src1_update(I, subst1(Subst, alub_src1(I))),
alub_src2_update(I0, subst1(Subst, alub_src2(I)));
- #branch{} ->
- I0 = branch_src1_update(I, subst1(Subst, branch_src1(I))),
- branch_src2_update(I0, subst1(Subst, branch_src2(I)));
#call{} ->
case call_is_known(I) of
false ->
@@ -1126,11 +1101,6 @@ subst_uses_llvm(Subst, I) ->
{NewSrc1, _ } = subst1_llvm(Subst1, alub_src1(I)),
I0 = alub_src1_update(I, NewSrc1),
alub_src2_update(I0, NewSrc2);
- #branch{} ->
- {NewSrc2, Subst1} = subst1_llvm(Subst, branch_src2(I)),
- {NewSrc1, _ } = subst1_llvm(Subst1, branch_src1(I)),
- I0 = branch_src1_update(I, NewSrc1),
- branch_src2_update(I0, NewSrc2);
#call{} ->
case call_is_known(I) of
false ->
@@ -1243,10 +1213,10 @@ subst_defines(Subst, I)->
case I of
#alu{} ->
alu_dst_update(I, subst1(Subst, alu_dst(I)));
+ #alub{dst=[]} ->
+ I;
#alub{} ->
alub_dst_update(I, subst1(Subst, alub_dst(I)));
- #branch{} ->
- I;
#call{} ->
call_dstlist_update(I, subst_list(Subst, call_dstlist(I)));
#comment{} ->
@@ -1313,7 +1283,6 @@ is_safe(Instr) ->
case Instr of
#alu{} -> true;
#alub{} -> false;
- #branch{} -> false;
#call{} -> false;
#comment{} -> false;
#enter{} -> false;
@@ -1340,6 +1309,24 @@ is_safe(Instr) ->
#switch{} -> false %% Maybe this is safe...
end.
+%% @spec reduce_unused(rtl_instruction())
+%% -> false | [rtl_instruction()].
+%%
+%% @doc Produces a simplified instruction sequence that is equivalent to [Instr]
+%% under the assumption that all results of Instr are unused, or 'false' if
+%% there is no such sequence (other than [Instr] itself).
+
+reduce_unused(Instr) ->
+ case Instr of
+ #alub{dst=Dst} when Dst =/= [] ->
+ [Instr#alub{dst=[]}];
+ _ ->
+ case is_safe(Instr) of
+ true -> [];
+ false -> false
+ end
+ end.
+
%%
%% True if argument is an alu-operator
%%
@@ -1386,17 +1373,6 @@ redirect_jmp(Jmp, ToOld, ToNew) ->
%% OBS: In a jmp instruction more than one labels may be identical
%% and thus need redirection!
case Jmp of
- #branch{} ->
- TmpJmp = case branch_true_label(Jmp) of
- ToOld -> branch_true_label_update(Jmp, ToNew);
- _ -> Jmp
- end,
- case branch_false_label(TmpJmp) of
- ToOld ->
- branch_false_label_update(TmpJmp, ToNew);
- _ ->
- TmpJmp
- end;
#switch{} ->
NewLbls = [case Lbl =:= ToOld of
true -> ToNew;
@@ -1591,13 +1567,6 @@ pp_instr(Dev, I) ->
io:format(Dev, "~n", []);
#label{} ->
io:format(Dev, "L~w:~n", [label_name(I)]);
- #branch{} ->
- io:format(Dev, " if (", []),
- pp_arg(Dev, branch_src1(I)),
- io:format(Dev, " ~w ", [branch_cond(I)]),
- pp_arg(Dev, branch_src2(I)),
- io:format(Dev, ") then L~w (~.2f) else L~w~n",
- [branch_true_label(I), branch_pred(I), branch_false_label(I)]);
#switch{} ->
io:format(Dev, " switch (", []),
pp_arg(Dev, switch_src(I)),
@@ -1606,7 +1575,10 @@ pp_instr(Dev, I) ->
io:format(Dev, ">\n", []);
#alub{} ->
io:format(Dev, " ", []),
- pp_arg(Dev, alub_dst(I)),
+ case alub_has_dst(I) of
+ true -> pp_arg(Dev, alub_dst(I));
+ false -> io:format(Dev, "_", [])
+ end,
io:format(Dev, " <- ", []),
pp_arg(Dev, alub_src1(I)),
io:format(Dev, " ~w ", [alub_op(I)]),
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 02:08:33 +0000