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--- lib/compiler/src/beam_bsm.erl.orig 2007-12-10 21:37:43.000000000 +0100
+++ lib/compiler/src/beam_bsm.erl 2007-12-10 21:38:20.000000000 +0100
@@ -269,9 +269,11 @@
btb_reaches_match_1(Is, btb_kill([Dst], Regs), D);
btb_reaches_match_2([{bs_init_bits,{f,0},_,_,_,_,Dst}|Is], Regs, D) ->
btb_reaches_match_1(Is, btb_kill([Dst], Regs), D);
-btb_reaches_match_2([{bs_append,{f,0},_,_,_,_,_,_,Dst}|Is], Regs, D) ->
+btb_reaches_match_2([{bs_append,{f,0},_,_,_,_,Src,_,Dst}=I|Is], Regs, D) ->
+ btb_ensure_not_used([Src], I, Regs),
btb_reaches_match_1(Is, btb_kill([Dst], Regs), D);
-btb_reaches_match_2([{bs_private_append,{f,0},_,_,_,_,Dst}|Is], Regs, D) ->
+btb_reaches_match_2([{bs_private_append,{f,0},_,_,Src,_,Dst}=I|Is], Regs, D) ->
+ btb_ensure_not_used([Src], I, Regs),
btb_reaches_match_1(Is, btb_kill([Dst], Regs), D);
btb_reaches_match_2([{bs_put_integer,{f,0},_,_,_,_}|Is], Regs, D) ->
btb_reaches_match_1(Is, Regs, D);
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