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Diff of /sml/trunk/HISTORY

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revision 1142, Wed Mar 13 22:25:37 2002 UTC revision 1168, Fri Mar 22 19:19:32 2002 UTC
# Line 13  Line 13 
13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Lal George
17    Date: 2002/03/22 14:18:25 EST
18    Tag: blume-20020321-cps-branch-prob
19    Description:
20    
21    Implemented the Ball-Larus branch prediction-heuristic, and
22    incorporated graphical viewers for control flow graphs.
23    
24    Ball-Larus Heuristic:
25    ---------------------
26    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
27    
28    By design it uses the Dempster-Shafer theory for combining
29    probabilities.  For example, in the function:
30    
31        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
32    
33    the ball-larus heuristics predicts that the n=0 is unlikely
34    (OH-heuristic), and the 'then' branch is unlikely because of the
35    RH-heuristic -- giving the 'then' branch an even lower combined
36    probability using the Dempster-Shater theory.
37    
38    Finally, John Reppy's loop analysis in MLRISC, further lowers the
39    probability of the 'then' branch because of the loop in the else
40    branch.
41    
42    
43    Graphical Viewing:
44    ------------------
45    I merely plugged in Allen's graphical viewers into the compiler. The
46    additional code is not much. At the top level, saying:
47    
48            Control.MLRISC.getFlag "cfg-graphical-view" := true;
49    
50    will display the graphical view of the control flow graph just before
51    back-patching.  daVinci must be in your path for this to work. If
52    daVinci is not available, then the default viewer can be changed
53    using:
54    
55            Control.MLRISC.getString "viewer"
56    
57    which can be set to "dot" or "vcg" for the corresponding viewers. Of
58    course, these viewers must be in your path.
59    
60    The above will display the compilation unit at the level of clusters,
61    many of which are small, boring, and un-interesting. Also setting:
62    
63            Control.MLRISC.getInt "cfg-graphical-view_size"
64    
65    will display clusters that are larger than the value set by the above.
66    
67    
68    ----------------------------------------------------------------------
69    Name: Matthias Blume
70    Date: 2002/03/21 22:20:00 EST
71    Tag: blume-20020321-kmp-bugfix
72    Description:
73    
74    Changed the interface to the KMP routine in PreString and fixed
75    a minor bug in one place where it was used.
76    
77    ----------------------------------------------------------------------
78    Name: Allen Leung
79    Date: 2002/03/21 20:30:00 EST
80    Tag: leunga-20020321-cfg
81    Description:
82    
83      Fixed a potential problem in cfg edge splitting.
84    
85    ----------------------------------------------------------------------
86    Name: Allen Leung
87    Date: 2002/03/21 17:15:00 EST
88    Tag: leunga-20020321-x86-fp-cfg
89    Description:
90    
91      1. Recoded the buggy parts of x86-fp.
92    
93         a. All the block reordering code has been removed.
94            We now depend on the block placement phases to do this work.
95    
96         b. Critical edge splitting code has been simplified and moved into the
97            CFG modules, as where they belong.
98    
99         Both of these were quite buggy and complex.  The code is now much, much
100         simpler.
101    
102      2. X86 backend.
103    
104         a. Added instructions for 64-bit support.  Instruction selection for
105            64-bit has not been committed, however, since that
106            requires changes to MLTREE which haven't been approved by
107            Lal and John.
108    
109         b. Added support for FUCOMI and FUCOMIP when generating code for
110            PentiumPro and above.  We only generate these instructions in
111            the fast-fp mode.
112    
113         c. Added cases for JP and JNP in X86FreqProps.
114    
115      3. CFG
116    
117         CFG now has a bunch of methods for edge splitting and merging.
118    
119      4. Machine description.
120    
121         John's simplification of MLTREE_BASIS.fcond broke a few machine
122         description things:
123    
124         rtl-build.{sig,sml} and hppa.mdl fixed.
125    
126         NOTE: the machine description stuff in the repository is still broken.
127               Again, I can't put my fixes in because that involves
128               changes to MLTREE.
129    
130    ----------------------------------------------------------------------
131    Name: Matthias Blume
132    Date: 2002/03/20 15:55:00 EST
133    Tag: blume-20020320-kmp
134    Description:
135    
136    Implemented Knuth-Morris-Pratt string matching in PreString and used
137    it for String.isSubstring, Substring.isSubstring, and
138    Substring.position.
139    
140    (Might need some stress-testing.  Simple examples worked fine.)
141    
142    ----------------------------------------------------------------------
143    Name: Matthias Blume
144    Date: 2002/03/19 16:37:00 EST
145    Tag: blume-20020319-witnesses
146    Description:
147    
148    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
149    
150    This implements a generic mechanism for changing constness qualifiers
151    anywhere within big C types without resorting to outright "casts".
152    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
153    modify the constness at the outermost level.)
154    The implementation of "convert" is based on the idea of "witness"
155    values -- values that are not used by the operation but whose types
156    "testify" to their applicability.  On the implementation side, "convert"
157    is simply a projection (returning its second curried argument).  With
158    cross-module inlining, it should not result in any machine code being
159    generated.
160    
161    ----------------------------------------------------------------------
162    Name: Matthias Blume
163    Date: 2002/03/15 16:40:00 EST
164    Tag: blume-20020315-basis
165    Description:
166    
167    Provided (preliminary?) implementations for
168    
169      {String,Substring}.{concatWith,isSuffix,isSubstring}
170    
171    and
172    
173      Substring.full
174    
175    Those are in the Basis spec but they were missing in SML/NJ.
176    
177    ----------------------------------------------------------------------
178    Name: Matthias Blume
179    Date: 2002/03/14 21:30:00 EST
180    Tag: blume-20020314-controls
181    Description:
182    
183    Controls:
184    ---------
185    
186    1. Factored out the recently-added Controls : CONTROLS stuff and put
187       it into its own library $/controls-lib.cm.  The source tree for
188       this is under src/smlnj-lib/Controls.
189    
190    2. Changed the names of types and functions in this interface, so they
191       make a bit more "sense":
192    
193          module -> registry
194          'a registry -> 'a group
195    
196    3. The interface now deals in ref cells only.  The getter/setter interface
197       is (mostly) gone.
198    
199    4. Added a function that lets one register an already-existing ref cell.
200    
201    5. Made the corresponding modifications to the rest of the code so that
202       everything compiles again.
203    
204    6. Changed the implementation of Controls.MLRISC back to something closer
205       to the original.  In particular, this module (and therefore MLRISC)
206       does not depend on Controls.  There now is some link-time code in
207       int-sys.sml that registers the MLRISC controls with the Controls
208       module.
209    
210    CM:
211    ---
212    
213      * One can now specify the lambda-split aggressiveness in init.cmi.
214    
215    ----------------------------------------------------------------------
216  Name: Allen Leung  Name: Allen Leung
217  Date: 2002/03/13 17:30:00 EST  Date: 2002/03/13 17:30:00 EST
218  Tag: leunga-20020313-x86-fp-unary  Tag: leunga-20020313-x86-fp-unary
# Line 75  Line 275 
275    provides a bit more "stability":  Once CM has seen a compilation    provides a bit more "stability":  Once CM has seen a compilation
276    unit, it keeps its identity constant (as long as you do not delete    unit, it keeps its identity constant (as long as you do not delete
277    those crucial CM/GUID/* files).  This means that when you change    those crucial CM/GUID/* files).  This means that when you change
278    and interface, compiler, then go back to the old interface, and    an interface, compile, then go back to the old interface, and
279    compile again, you arrive at the original pid.    compile again, you arrive at the original pid.
280    
281    There now also is a mechanism that instructs CM to use the plain    There now also is a mechanism that instructs CM to use the plain

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