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[smlnj] Diff of /sml/trunk/NOTES/HISTORY
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Diff of /sml/trunk/NOTES/HISTORY

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revision 1181, Wed Mar 27 21:27:27 2002 UTC revision 1201, Fri May 17 20:48:38 2002 UTC
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14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Matthias Blume  Name: Matthias Blume
17    Date: 2002/05/17 16:49:00 EDT
18    Tag: blume-20020517-controls
19    Description:
20    
21    0. John Reppy made several modifications to the SML/NJ library.
22       In particular, there is a shiny new controls-lib.cm.
23    
24    1. Pushed new controls interface through compiler so that everything
25       compiles again.
26    
27    2. Added FormatComb and FORMAT_COMB to the CML version of the
28       SML/NJ library (so that CML compiles again).
29    
30    3. Modified init scripts because XXX_DEFAULT environment variables
31       are no longer with us.  (Boot-time initialization is now done
32       using the same environment variables that are also used for
33       startup-time initialization of controls.)
34    
35    ----------------------------------------------------------------------
36    Name: Lal George
37    Date: 2002/05/15 09:20:10 EDT
38    Tag: george-20020515-pseudo-op-decls
39    Description:
40    
41            All pseudo-ops emitted before the first segment declaration
42    such as TEXT, DATA, and BSS directives are assumed to be global
43    declarations and are emitted first in the assembly file. This is
44    useful in a number of situations where one has pseudo-ops that are not
45    specific to any segment, and also works around the constraint that one
46    cannot have client pseudo-ops in the TEXT segment.
47    
48            Because no segment is associated with these declarations it is
49    an error to allocate any space or objects before the first segment
50    directive and an exception will be raised. However, we cannot make
51    this check for client pseudo-ops.
52    
53            These top level declarations are a field in the CFG graph_info.
54    In theory you can continue to add to this field after the CFG has been
55    built -- provided you know what you are doing;-)
56    
57    ----------------------------------------------------------------------
58    Name: Matthias Blume
59    Date: 2002/05/13 16:40:00 EDT
60    Tag: blume-20020513-pp-etc
61    Description:
62    
63    A few minor bugfixes:
64    
65      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
66        (Bogus printouts for redefined bindings still occur.  Compiler
67        bug should no longer occur now.  We need to redo the prettyprinter
68        from scratch.)
69    
70      - CM pathname printer now also adds escape sequences for ( and )
71    
72      - commend and docu fixes for ml-nlffi
73    
74    ----------------------------------------------------------------------
75    Name: Matthias Blume
76    Date: 2002/05/10 16:40:00 EDT
77    Tag: blume-20020510-erg-textio
78    Description:
79    
80    Applied the following bugfix provided by Emden Gansner:
81    
82        Output is corrupted when outputSubstr is used rather than output.
83    
84        The problem occurs when a substring
85    
86            ss = (s, dataStart, dataLen)
87    
88        where dataStart > 0, fills a stream buffer with avail bytes left.
89        avail bytes of s, starting at index dataStart, are copied into the
90        buffer, the buffer is flushed, and then the remaining dataLen-avail
91        bytes of ss are copied into the beginning of the buffer. Instead of
92        starting this copy at index dataStart+avail in s, the current code
93        starts the copy at index avail.
94    
95        Fix:
96        In text-io-fn.sml, change line 695 from
97             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
98        to
99             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
100    
101    ----------------------------------------------------------------------
102    Name: Matthias Blume
103    Date: 2002/04/12 13:55:00 EDT
104    Tag: blume-20020412-assyntax
105    Description:
106    
107    1. Grabbed newer assyntax.h from the XFree86 project.
108    2. Fiddled with how to compile X86.prim.asm without warnings.
109    3. (Very) Minor cleanup in CM.
110    
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2002/04/01 (no joke!) 17:07:00 EST
114    Tag: blume-20020401-x86div
115    Description:
116    
117    Added full support for div/mod/rem/quot on the x86, using the machine
118    instruction's two results (without clumsily recomputing the remainder)
119    directly where appropriate.
120    
121    Some more extensive power-of-two support was added to the x86 instruction
122    selector (avoiding expensive divs, mods, and muls where they can be
123    replaced with cheaper shifts and masks).  However, this sort of thing
124    ought to be done earlier, e.g., within the CPS optimizer so that
125    all architectures benefit from it.
126    
127    The compiler compiles to a fixed point, but changes might be somewhat
128    fragile nevertheless.  Please, report any strange things that you might
129    see wrt. div/mod/quot/rem...
130    
131    ----------------------------------------------------------------------
132    Name: Matthias Blume
133    Date: 2002/03/29 17:22:00
134    Tag: blume-20020329-div
135    Description:
136    
137    Fixed my broken div/mod logic.  Unfortunately, this means that the
138    inline code for div/mod now has one more comparison than before.
139    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
140    The problem was with quotient = 0, because that alone does not tell
141    us which way the rounding went.  One then has to look at whether
142    remainder and divisor have the same sign...  :(
143    
144    Anyway, I replaced the bootfiles with fresh ones...
145    
146    ----------------------------------------------------------------------
147    Name: Matthias Blume
148    Date: 2002/03/29 14:10:00 EST
149    Tag: blume-20020329-inlprims
150    Description:
151    
152    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
153    
154    Primops have changed. This means that the bin/boot-file formats have
155    changed as well.
156    
157    To make sure that there is no confusion, I made a new version.
158    
159    
160    CHANGES:
161    
162    * removed REMT from mltree (remainder should never overflow).
163    
164    * added primops to deal with divisions of all flavors to the frontend
165    
166    * handled these primops all the way through so they map to their respective
167      MLRISC support
168    
169    * used these primops in the implementation of Int, Int32, Word, Word32
170    
171    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
172    
173    * parameterized INLMIN, INLMAX, and INLABS by a numkind
174    
175    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
176      floating point
177    
178    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
179      and Real (but Real.abs maps to a separate floating-point-only primop)
180    
181    
182    TODO items:
183    
184    * Hacked Alpha32 instruction selection, disabling the selection of REMx
185      instructions because the machine instruction encoder cannot handle
186      them.  (Hppa, PPC, and Sparc instruction selection did not handle
187      REM in the first place, and REM is supported by the x86 machine coder.)
188    
189    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
190      selection phase.  (The two can be streamlined because the hardware
191      delivers both quotient and remainder at the same time anyway.)
192    
193    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
194      (Currently the behavior is inconsistent both across architectures and
195      wrt. the draft Basis spec.)
196    
197    * Word8 should eventually be handled natively, too.
198    
199    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
200      as if there currently is no execution path that could trigger it in
201      SML/NJ.  (The assumptions underlying functions arith and promotable do not
202      hold for things like multiplication and division.)
203    
204    ----------------------------------------------------------------------
205    Name: Matthias Blume
206  Date: 2002/03/27 16:27:00 EST  Date: 2002/03/27 16:27:00 EST
207  Tag: blume-20020327-mlrisc-divisions  Tag: blume-20020327-mlrisc-divisions
208  Description:  Description:

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