1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
%% -*- erlang-indent-level: 2 -*-
%%
%% 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.
-module(hipe_ppc_ra_postconditions_fp).
-export([check_and_rewrite/2]).
-include("hipe_ppc.hrl").
check_and_rewrite(CFG, Coloring) ->
TempMap = hipe_temp_map:cols2tuple(Coloring, hipe_ppc_specific_fp, no_context),
do_bbs(hipe_ppc_cfg:labels(CFG), TempMap, CFG, false).
do_bbs([], _TempMap, CFG, DidSpill) -> {CFG, DidSpill};
do_bbs([Lbl|Lbls], TempMap, CFG0, DidSpill0) ->
Code0 = hipe_bb:code(BB = hipe_ppc_cfg:bb(CFG0, Lbl)),
{Code, DidSpill} = do_insns(Code0, TempMap, [], DidSpill0),
CFG = hipe_ppc_cfg:bb_add(CFG0, Lbl, hipe_bb:code_update(BB, Code)),
do_bbs(Lbls, TempMap, CFG, DidSpill).
do_insns([I|Insns], TempMap, Accum, DidSpill0) ->
{NewIs, DidSpill1} = do_insn(I, TempMap),
do_insns(Insns, TempMap, lists:reverse(NewIs, Accum), DidSpill0 or DidSpill1);
do_insns([], _TempMap, Accum, DidSpill) ->
{lists:reverse(Accum), DidSpill}.
do_insn(I, TempMap) ->
case I of
#lfd{} -> do_lfd(I, TempMap);
#lfdx{} -> do_lfdx(I, TempMap);
#stfd{} -> do_stfd(I, TempMap);
#stfdx{} -> do_stfdx(I, TempMap);
#fp_binary{} -> do_fp_binary(I, TempMap);
#fp_unary{} -> do_fp_unary(I, TempMap);
#pseudo_fmove{} -> do_pseudo_fmove(I, TempMap);
#pseudo_spill_fmove{} -> do_pseudo_spill_fmove(I, TempMap);
_ -> {[I], false}
end.
%%% Fix relevant instruction types.
do_lfd(I=#lfd{dst=Dst}, TempMap) ->
{FixDst, NewDst, DidSpill} = fix_dst(Dst, TempMap),
NewI = I#lfd{dst=NewDst},
{[NewI | FixDst], DidSpill}.
do_lfdx(I=#lfdx{dst=Dst}, TempMap) ->
{FixDst, NewDst, DidSpill} = fix_dst(Dst, TempMap),
NewI = I#lfdx{dst=NewDst},
{[NewI | FixDst], DidSpill}.
do_stfd(I=#stfd{src=Src}, TempMap) ->
{FixSrc, NewSrc, DidSpill} = fix_src(Src, TempMap),
NewI = I#stfd{src=NewSrc},
{FixSrc ++ [NewI], DidSpill}.
do_stfdx(I=#stfdx{src=Src}, TempMap) ->
{FixSrc, NewSrc, DidSpill} = fix_src(Src, TempMap),
NewI = I#stfdx{src=NewSrc},
{FixSrc ++ [NewI], DidSpill}.
do_fp_binary(I=#fp_binary{dst=Dst,src1=Src1,src2=Src2}, TempMap) ->
{FixDst,NewDst,DidSpill1} = fix_dst(Dst, TempMap),
{FixSrc1,NewSrc1,DidSpill2} = fix_src(Src1, TempMap),
{FixSrc2,NewSrc2,DidSpill3} = fix_src(Src2, TempMap),
NewI = I#fp_binary{dst=NewDst,src1=NewSrc1,src2=NewSrc2},
{FixSrc1 ++ FixSrc2 ++ [NewI | FixDst], DidSpill1 or DidSpill2 or DidSpill3}.
do_fp_unary(I=#fp_unary{dst=Dst,src=Src}, TempMap) ->
{FixDst,NewDst,DidSpill1} = fix_dst(Dst, TempMap),
{FixSrc,NewSrc,DidSpill2} = fix_src(Src, TempMap),
NewI = I#fp_unary{dst=NewDst,src=NewSrc},
{FixSrc ++ [NewI | FixDst], DidSpill1 or DidSpill2}.
do_pseudo_fmove(I=#pseudo_fmove{dst=Dst,src=Src}, TempMap) ->
case temp_is_spilled(Src, TempMap)
andalso temp_is_spilled(Dst, TempMap)
of
true -> % Turn into pseudo_spill_fmove
Temp = clone(Src),
NewI = #pseudo_spill_fmove{dst=Dst,temp=Temp,src=Src},
{[NewI], true};
_ ->
{[I], false}
end.
do_pseudo_spill_fmove(I=#pseudo_spill_fmove{temp=Temp}, TempMap) ->
%% Temp is above the low water mark and must not have been spilled
false = temp_is_spilled(Temp, TempMap),
{[I], false}.
%%% Fix Dst and Src operands.
fix_src(Src, TempMap) ->
case temp_is_spilled(Src, TempMap) of
true ->
NewSrc = clone(Src),
{[hipe_ppc:mk_pseudo_fmove(NewSrc, Src)], NewSrc, true};
_ ->
{[], Src, false}
end.
fix_dst(Dst, TempMap) ->
case temp_is_spilled(Dst, TempMap) of
true ->
NewDst = clone(Dst),
{[hipe_ppc:mk_pseudo_fmove(Dst, NewDst)], NewDst, true};
_ ->
{[], Dst, false}
end.
%%% Check if an operand is a pseudo-temp.
temp_is_spilled(Temp, TempMap) ->
case hipe_ppc:temp_is_allocatable(Temp) of
true ->
Reg = hipe_ppc:temp_reg(Temp),
tuple_size(TempMap) > Reg andalso hipe_temp_map:is_spilled(Reg, TempMap);
false -> true
end.
%%% Create a new temp with the same type as an old one.
clone(Temp) ->
Type = hipe_ppc:temp_type(Temp), % XXX: always double?
hipe_ppc:mk_new_temp(Type).
|
