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diff --git a/lib/hipe/arm/hipe_arm_subst.erl b/lib/hipe/arm/hipe_arm_subst.erl
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+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 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
+%%
+%% http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% 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%
+%%
+
+-module(hipe_arm_subst).
+-export([insn_temps/2]).
+-include("hipe_arm.hrl").
+
+%% These should be moved to hipe_arm and exported
+-type temp() :: #arm_temp{}.
+-type shiftop() :: lsl | lsr | asr | ror.
+-type imm4() :: 0..15.
+-type imm5() :: 0..31.
+-type imm8() :: 0..255.
+-type am1() :: {imm8(),imm4()}
+ | temp()
+ | {temp(), rrx}
+ | {temp(), shiftop(), imm5()}
+ | {temp(), shiftop(), temp()}.
+-type am2() :: #am2{}.
+-type am3() :: #am3{}.
+-type arg() :: temp() | integer().
+-type funv() :: #arm_mfa{} | #arm_prim{} | temp().
+-type insn() :: tuple(). % for now
+
+-type subst_fun() :: fun((temp()) -> temp()).
+
+%% @doc Maps over the temporaries in an instruction
+-spec insn_temps(subst_fun(), insn()) -> insn().
+insn_temps(T, I) ->
+ AM1 = fun(O) -> am1_temps(T, O) end,
+ AM2 = fun(O) -> am2_temps(T, O) end,
+ AM3 = fun(O) -> am3_temps(T, O) end,
+ Arg = fun(O) -> arg_temps(T, O) end,
+ case I of
+ #alu {dst=D,src=L,am1=R} -> I#alu{dst=T(D),src=T(L),am1=AM1(R)};
+ #cmp {src=L,am1=R} -> I#cmp {src=T(L),am1=AM1(R)};
+ #load {dst=D,am2=S} -> I#load {dst=T(D),am2=AM2(S)};
+ #ldrsb {dst=D,am3=S} -> I#ldrsb {dst=T(D),am3=AM3(S)};
+ #move {dst=D,am1=S} -> I#move {dst=T(D),am1=AM1(S)};
+ #pseudo_move{dst=D,src=S} -> I#pseudo_move {dst=T(D),src=T(S)};
+ #store {src=S,am2=D} -> I#store {src=T(S),am2=AM2(D)};
+ #b_label{} -> I;
+ #comment{} -> I;
+ #label{} -> I;
+ #pseudo_bc{} -> I;
+ #pseudo_blr{} -> I;
+ #pseudo_call{funv=F} -> I#pseudo_call{funv=funv_temps(T, F)};
+ #pseudo_call_prepare{} -> I;
+ #pseudo_li{dst=D} -> I#pseudo_li{dst=T(D)};
+ #pseudo_switch{jtab=J=#arm_temp{},index=Ix=#arm_temp{}} ->
+ I#pseudo_switch{jtab=T(J),index=T(Ix)};
+ #pseudo_tailcall{funv=F,stkargs=Stk} ->
+ I#pseudo_tailcall{funv=funv_temps(T,F),stkargs=lists:map(Arg,Stk)};
+ #pseudo_tailcall_prepare{} -> I;
+ #smull{dstlo=DL,dsthi=DH,src1=L,src2=R} ->
+ I#smull{dstlo=T(DL),dsthi=T(DH),src1=T(L),src2=T(R)}
+ end.
+
+-spec am1_temps(subst_fun(), am1()) -> am1().
+am1_temps(_SubstTemp, T={C,R}) when is_integer(C), is_integer(R) -> T;
+am1_temps(SubstTemp, T=#arm_temp{}) -> SubstTemp(T);
+am1_temps(SubstTemp, {T=#arm_temp{},rrx}) -> {SubstTemp(T),rrx};
+am1_temps(SubstTemp, {A=#arm_temp{},Op,B=#arm_temp{}}) when is_atom(Op) ->
+ {SubstTemp(A),Op,SubstTemp(B)};
+am1_temps(SubstTemp, {T=#arm_temp{},Op,I}) when is_atom(Op), is_integer(I) ->
+ {SubstTemp(T),Op,I}.
+
+-spec am2_temps(subst_fun(), am2()) -> am2().
+am2_temps(SubstTemp, T=#am2{src=A=#arm_temp{},offset=O0}) ->
+ O = case O0 of
+ _ when is_integer(O0) -> O0;
+ #arm_temp{} -> SubstTemp(O0);
+ {B=#arm_temp{},rrx} -> {SubstTemp(B),rrx};
+ {B=#arm_temp{},Op,I} when is_atom(Op), is_integer(I) ->
+ {SubstTemp(B),Op,I}
+ end,
+ T#am2{src=SubstTemp(A),offset=O}.
+
+-spec am3_temps(subst_fun(), am3()) -> am3().
+am3_temps(SubstTemp, T=#am3{src=A=#arm_temp{},offset=O0}) ->
+ O = case O0 of
+ _ when is_integer(O0) -> O0;
+ #arm_temp{} -> SubstTemp(O0)
+ end,
+ T#am3{src=SubstTemp(A),offset=O}.
+
+-spec funv_temps(subst_fun(), funv()) -> funv().
+funv_temps(_SubstTemp, M=#arm_mfa{}) -> M;
+funv_temps(_SubstTemp, P=#arm_prim{}) -> P;
+funv_temps(SubstTemp, T=#arm_temp{}) -> SubstTemp(T).
+
+-spec arg_temps(subst_fun(), arg()) -> arg().
+arg_temps(_SubstTemp, Imm) when is_integer(Imm) -> Imm;
+arg_temps(SubstTemp, T=#arm_temp{}) -> SubstTemp(T).