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I did a mechanical transform from Word to TWord.<BR>
Nearly all of the constant folding was there, but only for 32bit operations (the only ones that existed).<BR>
I've "merely" been giving parity to the 64bit variants.<BR>
If anything, so far I have added checks.<BR>
Granted, there might be some missing.<BR>My experience though is that they are in there, somewhere, probably via the frontend calling check_hi/lo.<BR>
You know, I write code like Word.Shift(a, 123), I get a compile time warning and a runtime error.<BR>
<BR>
The large shift count is what comes to mind.<BR>
I can test the extract/insert n + i stuff.<BR>
<BR>
I'm going to test with TWord.Extract put back.<BR>
It ended up not used by my fix.<BR>
Sorry about that.<BR>
<BR>
- Jay<BR><BR> <BR>
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Subject: Re: [M3commit] CVS Update: cm3<BR>From: hosking@cs.purdue.edu<BR>Date: Wed, 10 Feb 2010 10:32:29 -0500<BR>CC: m3commit@elegosoft.com<BR>To: jay.krell@cornell.edu<BR><BR><BASE>I'm worried what it does for use of TWord.Extract with constant folding. The semantics of Word.Extract mandate a checked run-time error for n+i>Word.Size. We want to get that behaviour by not constant folding when the error might occur, so that the programmer gets the appropriate run-time error.
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<DIV>On 10 Feb 2010, at 04:47, Jay K wrote:</DIV><BR class=ecxApple-interchange-newline>
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<DIV style="FONT-FAMILY: Verdana; FONT-SIZE: 10pt" class=ecxhmmessage>Shall I go ahead and let Extract act as if the data is infinitely zero extended?<BR>That seems easy to do. I don't know if it will fix the problems, or cause other problems.<BR>It is easy to try. The danger is if it causes subtle undetected-at-first-and-for-a-while problems.<BR> <BR> <BR> - Jay<BR><BR> <BR>
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From:<SPAN class=ecxApple-converted-space> </SPAN><A href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</A><BR>Date: Mon, 8 Feb 2010 11:36:31 -0500<BR>To:<SPAN class=ecxApple-converted-space> </SPAN><A href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</A><BR>CC:<SPAN class=ecxApple-converted-space> </SPAN><A href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</A><BR>Subject: Re: [M3commit] CVS Update: cm3<BR><BR>
<DIV>Yes, that is what I am now trying to clean up.</DIV>
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<DIV>On 8 Feb 2010, at 11:18, Jay K wrote:</DIV><BR class=ecxecxApple-interchange-newline>
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<DIV style="FONT-FAMILY: Verdana; FONT-SIZE: 10pt" class=ecxecxhmmessage>Rodney I *think* generally mixed sizes are supported in TWord, TInt.<BR> Though I don't necessarily understand all of the code.<BR>There was a problem recently fixed, granted.<BR>One problem here though is that you can't TWord.Extract beyond the size.<BR>So the varying sizes of "zero" behave differently.<BR>You might imagine it's zeros as far out as needed, but it doesn't work that way currently.<BR> <BR> - Jay<BR> <BR>> Date: Mon, 8 Feb 2010 10:02:58 -0600<BR>> From:<SPAN class=ecxecxApple-converted-space> </SPAN><A href="mailto:rodney_bates@lcwb.coop">rodney_bates@lcwb.coop</A><BR>> To:<SPAN class=ecxecxApple-converted-space> </SPAN><A href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</A><BR>> Subject: Re: [M3commit] CVS Update: cm3<BR>><SPAN class=ecxecxApple-converted-space> </SPAN><BR>><SPAN class=ecxecxApple-converted-space> </SPAN><BR>><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> Jay K wrote:<BR>> > I wonder if we need<BR>> > TInt8, TInt16, TInt32, TInt64, TInt, TLong<BR>> > TWord8, TWord16, TWord32, TWord64, TWord, TLongWord<BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > that accurately implement ints/words of the exact specified size,<BR>> > with TInt/TWord/TLong/TLongWord depending on the target.<BR>> > I wouldn't mind trying to remove this word "Word".<BR>> > And replace it with UInt or such.<BR>> > TInt, TUInt, TLong, TULong?<BR>> > TSignedInt, TUnsignedInt, TSignedLong, TUnsignedLong?<BR>> > TInt, TUnsignedInt, TLong, TUnsignedLong?<BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > TInt.Zero is just always 8 bytes.<BR>> > The size is I believe meant to be fairly opaque to the user.<BR>> > This is the first I've noticed it being visible, such that TInt.EQ is<SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > true for values with "quite different" behavior. I would have "thunk"<SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > (thought without much thought) that anything TInt.EQ is more equivalent<SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > than they actually are.<BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> Hmm. I recall in a discussion a while back that the arithmetic on<BR>> target ints was not coded to handle operands with mixed values of<BR>> n. Could this have something to do with this?<BR>><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> > - Jay<BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> ><SPAN class=ecxecxApple-converted-space> </SPAN><BR>> ><BR></DIV></SPAN></BLOCKQUOTE></DIV><BR></DIV></SPAN><BR class=ecxApple-interchange-newline></BLOCKQUOTE></DIV><BR></DIV> </body>
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