similar to: LLVM Status Update

Hi Everyone, Sorry for the long overdue status update, as you might guess, the holidays have been busy for everyone. :) Here's your periodic dose of updates on the progress of LLVM, which takes us from the LLVM 1.4 release until present CVS. I appologize if I forgot anything! Big Things: 1. Brian contributed a new SparcV8 backend, which (unlike the SparcV9 backend) uses the

I'm getting the error below on Ubuntu Hardy on ia32 on r55688. John make[3]: Entering directory `/home/regehr/llvm-gcc/build/gcc' gcc -c -g -DIN_GCC -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Wold-style-definition -Wmissing-format-attribute -DHAVE_CONFIG_H -I. -I. -I../../gcc

News flash: LLVM 1.2 is now available! -------------------------------------- LLVM 1.2 is the result of ~3 months of hard work by many people in the LLVM community. It contains a bunch of new features, produces substantially better code, and has many bug fixes over the 1.1 release. A detailed list of new and improved features are included in the 1.2 release notes:

News flash: LLVM 1.2 is now available! -------------------------------------- LLVM 1.2 is the result of ~3 months of hard work by many people in the LLVM community. It contains a bunch of new features, produces substantially better code, and has many bug fixes over the 1.1 release. A detailed list of new and improved features are included in the 1.2 release notes:

Chris Lattner wrote: > On Wed, 10 May 2006, Nick Lewycky wrote: > >>> Then just run the SCCP pass, and check to see if any operands satisfy >>> the predicate "isa<UndefValue>(V)". LLVM explicitly represents >>> undefined values. >> >> >> I have a case where it doesn't, but perhaps the SCCP pass isn't to blame: >>

Hi all again, llvm is failing the 2006-11-30-NoCompileUnit and 2006-11-30-Pubnames tests on me. -m32 and --disable-multilib didn't change the outcome. Did I get the command wrong? I tried jo at kurier:~/Delta/llvm/test$ CFLAGS=--multilib make check See below for a transcript of the failed check. What next? Regards, Jo -- snip -- jo at kurier:~/Delta/llvm/test$ make check llvm[0]:

The project that I use to test LLVM against showed that currently llvm-ld doesn't honor the -Ox switch. $ /usr/src/llvm/dist/bin/llvm-ld \ -v -stats -native -O1 -strip-all \ -o main \ -L/usr/share/qt3/lib -L/usr/X11R6/lib \ -lcrypto -lusb -lutil -lqt-mt -lXext -lX11 -lm -lpthread ... $ size main text data bss dec hex filename 1128271 71980 8392 1208643 127143

On Tue, 22 Feb 2005, Vikram S. Adve wrote: >> The second issue is that we need to do redundancy elimination and hoisting >> on operations that are only exposed once instruction selection is >> performed. Getelementptr expansion is just ONE particular case of this, >> but it can happen with any instructions (including the use of large integer >> (or any FP)

On Wednesday 21 May 2008 15:48, Chris Lattner wrote: > > What's the difference between GVN and GCSE, if they both perform common > > subexpression elimination? > > GVN does more, and is a better algorithm. GCSE is basically deprecated > and should be removed at some point. Er...waitaminute. Maybe there's something I don't fully grok about GVN, but in general,

I'm new to the LLVM, so please forgive what might be a silly question. I'd like to use the opt bytecode-to-bytecode optimizer, but when I try running it to do, for example, dead code elimination (-dce) or global common subexpression elimination (-gcse), nothing much seems to happen: opt -gcse -dce -o bar-opt.bc bar.bc llvm2cpp -o bar-opt.cpp bar-opt.bc

In case anyone's interested, I followed up in the linux-nfs mailing list: https://marc.info/?l=linux-nfs&m=156887818618861&w=2 Thanks, Alkis On 9/15/19 10:51 AM, Alkis Georgopoulos wrote: > I think I got it. > > Both nfsmount and `mount -t nfs` now default to rsize/wsize = 1 MB. > By lowering this to 32K, all issues are gone, even with the default > timeo=7. And

On Wed, 10 May 2006, Nick Lewycky wrote: >> Then just run the SCCP pass, and check to see if any operands satisfy >> the predicate "isa<UndefValue>(V)". LLVM explicitly represents >> undefined values. > > I have a case where it doesn't, but perhaps the SCCP pass isn't to blame: > > extern void write_char(int); > > const char foo[4] =

> > Now the problem is obvious.  A two dimensional array access is being > performed by a single instruction.  The arithmetic needed to address > the element is implicit, and therefore inaccessible to optimizations.  > The redundant calculations can not be eliminated, nor can strength > reduction be performed.  getelementptr needs to be broken down into > its constituent

I figured getelementptr exists as it does to facilitate data flow analysis, but it does need to be broken down before instruction selection. It's not just the missed optimization opportunities. It also introduces a huge amount of complexity into instruction selection as they deal with its complexity. It would also take care of many of the FIXMEs in LoopStrengthReduce. Vikram Adve

On Mon, 21 Feb 2005, Jeff Cohen wrote: > I figured getelementptr exists as it does to facilitate data flow analysis, > but it does need to be broken down before instruction selection. It's not > just the missed optimization opportunities. It also introduces a huge amount > of complexity into instruction selection as they deal with its complexity. > It would also take care

On Wed, 21 May 2008, Nicolas Capens wrote: > Thanks for the detailed explanations. I have a few remaining questions: > > Am I correct that ScalarReplAggregates is hardly more expensive than Mem2Reg > and therefore generally preferable? Right. > What would be the code quality implications of using "-dce -simplifycfg" > instead of -adce? As far as I understand the

Actually, <algorithm> is not correct. This remove is in stdio.h and io.h in VC7.1. It removes a file, not elements from a collection. The proper solution is to not use remove at all and use Path::destroy_file(). On Fri, 24 Sep 2004 08:09:37 -0700 Jeff Cohen <jeffc at jolt-lang.org> wrote: > <algorithm> works too. > > On Fri, 24 Sep 2004 10:09:21 -0500 > Alkis

I think I got it. Both nfsmount and `mount -t nfs` now default to rsize/wsize = 1 MB. By lowering this to 32K, all issues are gone, even with the default timeo=7. And nfsroot=xxx client responsiveness is a whole lot better. I think when nfsmount was initially written, the default rsize/wsize were much lower, which matched the timeo=7. Now they cause the lags/timeouts that I reported. So

On FreeBSD 4.7 I noticed that when compiling kernel modules, the kernel options are not available to the modules. For example, my if_em.ko is not being compiled with the DEVICE_POLLING configuration It looks like "-include opt_global.h" is not being applied when compiling the module. Kernel compilation of if_em.c: cc -c -O2 -pipe -malign-loops=4 -malign-jumps=4 -malign-functions=4

On Mar 16, 2006, at 8:47 PM, Chris Lattner wrote: > On Thu, 16 Mar 2006, Eric Kidd wrote: >> The duplicate loads appear at the top of the %regex6 and %regex2 >> blocks below. I've tried various alias analysis implementations >> either alone or in combination. > > LICM doesn't remove common subexpressions, also -load-vn doesn't > affect LICM. Try