<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On Aug 6, 2012, at 11:51 PM, Mike Cowlishaw wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial">OK, thanks .. sounds as though the string conversion was worth
discussion. One definitely wants printf to show the 'quantum effects' by
default. On another reading of this part of the 'a'
formatting:</font></span></div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"><font size="2" face="Symbol"><font size="2" face="Symbol"></font></font></font></span> </div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"><font size="2" face="Symbol"><font size="2" face="Symbol"> • </font></font><font size="3"><font color="#000000"><font face="Times New Roman">if 0 >= <i>q </i></font><font face="Times New Roman">>= -(<i>n</i></font><font face="Times New Roman">+5),
use style <b>f </b></font><font face="Times New Roman">formatting <font color="#ff0000">with formatting precision equal to -<i>q</i></font></font><font face="ArialMT"><font face="ArialMT"><font face="Times New Roman">,</font></font></font></font></font></font></span></div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial">Perhaps it is the bit in red that 'does the right
thing'? Anyway, worth being very explicit about the intent, I
suggest.</font></span></div></div></blockquote><div><br></div>I added this at the beginning of 11.5:</div><div><br></div><div>
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mso-bidi-language:AR-SA">With the following decimal forms of the </span><b style="mso-bidi-font-weight:normal"><span style="font-size:10.0pt;mso-bidi-font-size:
12.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";
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12.0pt;font-family:"Courier New";mso-fareast-font-family:"Times New Roman";
mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">A</span></b><span style="font-size:10.0pt;mso-bidi-font-size:12.0pt;font-family:Arial;mso-fareast-font-family:
"Times New Roman";mso-bidi-font-family:"Times New Roman";mso-ansi-language:
EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA"> format specifiers,
the </span><b style="mso-bidi-font-weight:normal"><span style="font-size:10.0pt;
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mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language:
EN-US;mso-bidi-language:AR-SA"> family of functions provide conversions to
decimal character sequences that preserve quantum exponents, as required by IEC
60559.</span><!--EndFragment--> </div><div> <br><blockquote type="cite"><div style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial">And an Editor's nitpick :-) what's that character before
the left parenthesis and the final q in that line? See: <a href="http://speleotrove.com/decimal/decifaq2.html#minuses">http://speleotrove.com/decimal/decifaq2.html#minuses</a>
</font></span></div></div></blockquote><div><br></div>Right. I changed the one you noted and the "n - 1" in the next line. What are your thoughts about unary minus? Exponent signs, as in 123e-4? The ones in the document look ok to me.</div><div><br></div><div>-Jim</div><div><br></div><div><blockquote type="cite"><div style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space">
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span class="333364306-07082012"><font color="#0000ff" size="2" face="Arial">Mike</font></span></div><br>
<blockquote style="BORDER-LEFT: #0000ff 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px" dir="ltr">
<div dir="ltr" lang="en-us" class="OutlookMessageHeader" align="left">
<hr tabindex="-1">
<font size="2" face="Tahoma"><b>From:</b> Jim Thomas
[mailto:jaswthomas@SBCGLOBAL.NET] <br><b>Sent:</b> 06 August 2012
21:57<br><b>To:</b> Mike Cowlishaw; CFP<br><b>Subject:</b> Re: C binding for
IEEE 754-2008<br></font><br></div>
<div></div>Mike, thanks for the comments. Please see responses below - also
sent to the CFP study group.
<div><br></div>
<div>-Jim</div>
<div><br>
<div>
<div>On Aug 6, 2012, at 2:34 AM, Mike Cowlishaw wrote:</div><br class="Apple-interchange-newline">
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<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012">Hi Jim,</span></font></div>
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012"></span></font> </div>
<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012">I have read through the Part 2 draft and also
Fred's comments -- it is all looking very good. I have only a few
minor comments, with perhaps the last one being the most
significant:</span></font></div>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012">Comments on WG14 Study Group Draft (cfp2) -- July
22, 2012</span></font></div>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012">PDF page 5, para 3: this paragraph might be
confusing to later<br> readers, because z/Architecture machines have
had floating point<br> decimal units for around 5 years and so
"This, however, provides<br> integer arithmetic only" is
incorrect. Perhaps something like<br> "Prior to the IBM System
z10 processor, however, this provided<br> integer arithmetic
only"?</span></font></div></blockquote></div></blockquote>Ok.<br>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012">PDF page 10: in the table the values for Emax and
Emin are different<br> from the emax and emin values in IEC 60559 --
presumably a<br> different definition is used in C11. Worth a
footnote to warn the<br> reader? The reader is referred to IEC
60559 for semantics, but<br> using Emax instead of emax would give
incorrect results.</span></font></div></blockquote></div></blockquote>The
mismatch between the IEC 60559 and C models is indeed confusing. Yes, a
footnote warning about the difference might be helpful.<br>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012">PDF page 17, table: 'IEEE 754' should be 'IEC
60559'?</span></font></div></blockquote></div></blockquote>Right.<br>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012">PDF pages 29-30: I'm not familiar with the
definition of "style f<br> formatting" in C11, but it is worth
emphasising that conversions to<br> strings (in printf for example)
rpreserve th
quantum.</span></font></div></blockquote></div></blockquote>Style-f formatting
doesn't generally preserve the quantum exponent. The decimal a,A formatting
does though.<br>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012"> Perhaps add to the examples on page 30
some where c ends in 0,<br> e.g.:</span></font></div>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012"> ( 1, 120, -8)
0.00000120<br> ( 1, 120, -9)
1.20e-7</span></font></div></blockquote></div></blockquote>Good.<br>
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<div dir="ltr" align="left"><font size="2" face="Courier"><span class="023162909-06082012"> In other words, a 'default' conversion
from a _Decimal to a string<br> and back to the same type of
_Decimal must result in a _Decimal<br> that is identical in (s, c,
q) to the
original.</span></font></div></blockquote></div></blockquote>Assuming by
'default' you mean default a,A conversion.</div>
<div><br>
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<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012">Also, it might be worth adding this link to your
Wiki: <a href="http://speleotrove.com/decimal/">http://speleotrove.com/decimal/</a></span></font></div></div></blockquote>
<div><br></div>Agreed</div>
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<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012">Feel free to forward this to the working
group. I'd be happy to reply to any specific questions,
etc.</span></font></div>
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<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Arial"><span class="023162909-06082012">Cheers -- Mike</span></font></div>
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