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diff --git a/lib/hipe/ppc/hipe_ppc_defuse.erl b/lib/hipe/ppc/hipe_ppc_defuse.erl
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+%% -*- erlang-indent-level: 2 -*-
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2004-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+
+-module(hipe_ppc_defuse).
+-export([insn_def_all/1, insn_use_all/1]).
+-export([insn_def_gpr/1, insn_use_gpr/1]).
+-export([insn_def_fpr/1, insn_use_fpr/1]).
+-include("hipe_ppc.hrl").
+
+%%%
+%%% Defs and uses for both general-purpose and floating-point registers.
+%%% This is needed for the frame module, alas.
+%%%
+insn_def_all(I) ->
+  addtemps(insn_def_fpr(I), insn_def_gpr(I)).
+
+insn_use_all(I) ->
+  addtemps(insn_use_fpr(I), insn_use_gpr(I)).
+
+%%%
+%%% Defs and uses for general-purpose (integer) registers only.
+%%%
+insn_def_gpr(I) ->
+  case I of
+    #alu{dst=Dst} -> [Dst];
+    #load{dst=Dst} -> [Dst];
+    #loadx{dst=Dst} -> [Dst];
+    #mfspr{dst=Dst} -> [Dst];
+    #pseudo_call{} -> call_clobbered_gpr();
+    #pseudo_li{dst=Dst} -> [Dst];
+    #pseudo_move{dst=Dst} -> [Dst];
+    #pseudo_tailcall_prepare{} -> tailcall_clobbered_gpr();
+    #unary{dst=Dst} -> [Dst];
+    _ -> []
+  end.
+
+call_clobbered_gpr() ->
+  [hipe_ppc:mk_temp(R, T)
+   || {R,T} <- hipe_ppc_registers:call_clobbered() ++ all_fp_pseudos()].
+
+all_fp_pseudos() -> [].	% XXX: for now
+
+tailcall_clobbered_gpr() ->
+  [hipe_ppc:mk_temp(R, T)
+   || {R,T} <- hipe_ppc_registers:tailcall_clobbered() ++ all_fp_pseudos()].
+
+insn_use_gpr(I) ->
+  case I of
+    #alu{src1=Src1,src2=Src2} -> addsrc(Src2, [Src1]);
+    #blr{} ->
+      [hipe_ppc:mk_temp(hipe_ppc_registers:return_value(), 'tagged')];
+    #cmp{src1=Src1,src2=Src2} -> addsrc(Src2, [Src1]);
+    #load{base=Base} -> [Base];
+    #loadx{base1=Base1,base2=Base2} -> addtemp(Base1, [Base2]);
+    #mtcr{src=Src} -> [Src];
+    #mtspr{src=Src} -> [Src];
+    #pseudo_call{sdesc=#ppc_sdesc{arity=Arity}} -> arity_use_gpr(Arity);
+    #pseudo_move{src=Src} -> [Src];
+    #pseudo_tailcall{arity=Arity,stkargs=StkArgs} ->
+      addsrcs(StkArgs, addtemps(tailcall_clobbered_gpr(), arity_use_gpr(Arity)));
+    #store{src=Src,base=Base} -> addtemp(Src, [Base]);
+    #storex{src=Src,base1=Base1,base2=Base2} ->
+      addtemp(Src, addtemp(Base1, [Base2]));
+    #unary{src=Src} -> [Src];
+    #lfd{base=Base} -> [Base];
+    #lfdx{base1=Base1,base2=Base2} -> addtemp(Base1, [Base2]);
+    #stfd{base=Base} -> [Base];
+    #stfdx{base1=Base1,base2=Base2} -> addtemp(Base1, [Base2]);
+    _ -> []
+  end.
+
+arity_use_gpr(Arity) ->
+  [hipe_ppc:mk_temp(R, 'tagged')
+   || R <- hipe_ppc_registers:args(Arity)].
+
+addsrcs([Arg|Args], Set) ->
+  addsrcs(Args, addsrc(Arg, Set));
+addsrcs([], Set) ->
+  Set.
+
+addsrc(Src, Set) ->
+  case Src of
+    #ppc_temp{} -> addtemp(Src, Set);
+    _ -> Set
+  end.
+
+%%%
+%%% Defs and uses for floating-point registers only.
+%%%
+insn_def_fpr(I) ->
+  case I of
+    #pseudo_call{} -> call_clobbered_fpr();
+    #lfd{dst=Dst} -> [Dst];
+    #lfdx{dst=Dst} -> [Dst];
+    #fp_binary{dst=Dst} -> [Dst];
+    #fp_unary{dst=Dst} -> [Dst];
+    #pseudo_fmove{dst=Dst} -> [Dst];
+    _ -> []
+  end.
+
+call_clobbered_fpr() ->
+  [hipe_ppc:mk_temp(R, 'double') || R <- hipe_ppc_registers:allocatable_fpr()].
+
+insn_use_fpr(I) ->
+  case I of
+    #stfd{src=Src} -> [Src];
+    #stfdx{src=Src} -> [Src];
+    #fp_binary{src1=Src1,src2=Src2} -> addtemp(Src1, [Src2]);
+    #fp_unary{src=Src} -> [Src];
+    #pseudo_fmove{src=Src} -> [Src];
+    _ -> []
+  end.
+
+%%%
+%%% Auxiliary operations on sets of temps
+%%% These sets are small. No point using gb_trees, right?
+%%%
+
+addtemps([Arg|Args], Set) ->
+  addtemps(Args, addtemp(Arg, Set));
+addtemps([], Set) ->
+  Set.
+
+addtemp(Temp, Set) ->
+  case lists:member(Temp, Set) of
+    false -> [Temp|Set];
+    _ -> Set
+  end.