<html><head><base href="x-msg://1665/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Do you alloca on every TRY or once in procedures that have a TRY?<div><br><div>
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"><div><font class="Apple-style-span" color="#0000FF"><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; "><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; ">Antony Hosking</span></span></font></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: 'Gill Sans'; "><span class="Apple-style-span" style="font-family: 'Gill Sans'; "><span class="Apple-converted-space"> </span>|<span class="Apple-converted-space"> </span></span></span><span class="Apple-style-span" style="font-family: 'Gill Sans'; "><span class="Apple-style-span" style="font-family: 'Gill Sans'; ">Associate Professor</span></span><span class="Apple-style-span" style="font-family: 'Gill Sans'; "><span class="Apple-style-span" style="font-family: 'Gill Sans'; "> | Computer Science | Purdue University</span></span></font></div><div><font class="Apple-style-span" face="GillSans-Light"><span class="Apple-style-span" style="font-family: GillSans-Light; 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<br><div><div>On Jan 5, 2011, at 3:44 PM, Jay K wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div class="hmmessage" style="font-size: 10pt; font-family: Tahoma; ">I only have phone right now. I think it is fairly clear: the jumpbuf in EF1 is now allocated with alloca, and a pointer stored. It is definitely a bit less efficient, but the significant advantage is frontend no longer needs to know the size or alignment of a jumpbuf.<br><br><br>As well, there is no longer the problem regarding jumpbuf aligned to more than 64 bits. I at least checked on Linux/PowerPC and alloca seems to align to 16 bytes. I don't have an HPUX machine currently to see if the problem is addressed there.<br><br><br>The inefficiency of course can be dramatically mitigated via a stack walker. I wanted to do this first though, while more targets using setjmp.<br><br>- Jay/phone<br><br><hr>Subject: Re: [M3commit] CVS Update: cm3<br>From:<span class="Apple-converted-space"> </span><a href="mailto:hosking@cs.purdue.edu">hosking@cs.purdue.edu</a><br>Date: Wed, 5 Jan 2011 13:35:59 -0500<br>CC:<span class="Apple-converted-space"> </span><a href="mailto:jkrell@elego.de">jkrell@elego.de</a>;<span class="Apple-converted-space"> </span><a href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</a><br>To:<span class="Apple-converted-space"> </span><a href="mailto:jay.krell@cornell.edu">jay.krell@cornell.edu</a><br><br>Can you provide a more descriptive checkin comment? I don't know what has been done here without diving into the diff.<div><br><div><div><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><div style="word-wrap: break-word; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><span class="ecxApple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; "><div><font class="ecxApple-style-span" color="#0000FF"><font class="ecxApple-style-span" face="Gill Sans"><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; ">Antony Hosking</span></span></font></font><font class="ecxApple-style-span" face="Gill Sans"><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; "><span class="ecxApple-converted-space"> </span>|<span class="ecxApple-converted-space"> </span></span></span><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; ">Associate Professor</span></span><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="font-family: 'Gill Sans'; "> | Computer Science | Purdue University</span></span></font></div><div><font class="ecxApple-style-span" face="GillSans-Light"><span class="ecxApple-style-span" style="font-family: GillSans-Light; ">305 N. University Street | West Lafayette | IN 47907 | USA</span></font></div><div><font class="ecxApple-style-span" color="#0000FF" face="Gill Sans"><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; ">Office</span></span></font><font class="ecxApple-style-span" face="GillSans-Light"><span class="ecxApple-style-span" style="font-family: GillSans-Light; "><span class="ecxApple-style-span" style="font-family: GillSans-Light; "> +1 765 494 6001 |<span class="ecxApple-converted-space"> </span></span></span></font><font class="ecxApple-style-span" color="#0000FF" face="Gill Sans"><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; "><span class="ecxApple-style-span" style="color: rgb(0, 0, 255); font-family: 'Gill Sans'; ">Mobile</span></span></font><font class="ecxApple-style-span" face="GillSans-Light"><span class="ecxApple-style-span" style="font-family: GillSans-Light; "><span class="ecxApple-style-span" style="font-family: GillSans-Light; "><span class="ecxApple-converted-space"> </span>+1 765 427 5484</span></span></font></div><div><font class="ecxApple-style-span" face="GillSans-Light"><br class="ecxkhtml-block-placeholder"></font></div></span></span></span></span></span></span></span><br class="ecxApple-interchange-newline"></span></div></span></span><br class="ecxApple-interchange-newline"></div><br><div><div>On Jan 5, 2011, at 9:37 AM, Jay K wrote:</div><br class="ecxApple-interchange-newline"><blockquote><span class="ecxApple-style-span" style="border-collapse: separate; font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; font-size: medium; "><div class="ecxhmmessage" style="font-size: 10pt; font-family: Tahoma; ">diff attached<br><br>> Date: Wed, 5 Jan 2011 15:34:55 +0000<br>> To:<span class="ecxApple-converted-space"> </span><a href="mailto:m3commit@elegosoft.com">m3commit@elegosoft.com</a><br>> From:<span class="ecxApple-converted-space"> </span><a href="mailto:jkrell@elego.de">jkrell@elego.de</a><br>> Subject: [M3commit] CVS Update: cm3<br>><span class="ecxApple-converted-space"> </span><br>> CVSROOT: /usr/cvs<br>> Changes by: jkrell@birch. 11/01/05 15:34:55<br>><span class="ecxApple-converted-space"> </span><br>> Modified files:<br>> cm3/m3-libs/m3core/src/C/Common/: Csetjmp.i3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/C/I386_CYGWIN/: Csetjmp.i3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/C/I386_MINGW/: Csetjmp.i3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/C/I386_NT/: Csetjmp.i3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/C/NT386/: Csetjmp.i3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/runtime/ex_frame/: RTExFrame.m3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-libs/m3core/src/unix/Common/: Uconstants.c<span class="ecxApple-converted-space"> </span><br>> cm3/m3-sys/m3cc/gcc/gcc/m3cg/: parse.c<span class="ecxApple-converted-space"> </span><br>> cm3/m3-sys/m3front/src/misc/: Marker.m3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-sys/m3front/src/stmts/: TryFinStmt.m3 TryStmt.m3<span class="ecxApple-converted-space"> </span><br>> cm3/m3-sys/m3middle/src/: M3RT.i3 M3RT.m3 Target.i3 Target.m3<span class="ecxApple-converted-space"> </span><br>><span class="ecxApple-converted-space"> </span><br>> Log message:<br>> use: extern INTEGER Csetjmp__Jumpbuf_size /* = sizeof(jmp_buf);<br>> alloca(Csetjmp__Jumpbuf_size)<br>><span class="ecxApple-converted-space"> </span><br>> to allocate jmp_buf<br>><span class="ecxApple-converted-space"> </span><br>> - eliminates a large swath of target-dependent code<br>> - allows for covering up the inability to declare<br>> types with alignment > 64 bits<br>><span class="ecxApple-converted-space"> </span><br>> It is, granted, a little bit slower, in an already prety slow path.<br>> Note that alloca isn't actually a function call, at least with gcc backend.<br>><span class="ecxApple-converted-space"> </span><br><span><jmpbuf_alloca.txt></span></div></span></blockquote></div><br></div></div></div></span><br class="Apple-interchange-newline"></blockquote></div><br></div></body></html>