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...er, when I tried this, the instructions were executed on entry to the function before the vector registers have been assigned. How do I add these instructions so they appear after .cfi_startproc but are not executed on entry to the function? Or is there another approach I need to take? Thanks, Zaara Syeda -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20171006/666d7814/attachment.html>

...ostly or fatal, it can be lowered safely. MartinO From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of David Jones via llvm-dev Sent: 30 December 2016 00:28 To: Philip Reames <listmail at philipreames.com> Cc: llvm-dev <llvm-dev at lists.llvm.org>; Zaara Syeda <syzaara at ca.ibm.com> Subject: Re: [llvm-dev] RFC: Inline expansion of memcmp vs call to standard library Can I make another suggestion: create an intrinsic for memory equality, e.g. llvm.memcmp_eq.p0i8.p0i8.i64(i8*a, i8*b, i64 len). This intrinsic would return zero if the memory...

..., you may very well get the code you > want. > > Using the psuedo instruction here feels messy. In particular, I don't > like the fact it basically opts out of all of the combines which might > further improve the lowering. > > Philip > > > On 12/29/2016 11:35 AM, Zaara Syeda via llvm-dev wrote: > > Currently on PowerPC, calls to memcmp are not expanded and are left as > library calls. In certain conditions, expansion can improve performance > rather than calling the library function as done for functions like memcpy, > memmove, etc. This patch *(**...

...iciently lowering and chains using branches, you may very well get the code you want. Using the psuedo instruction here feels messy. In particular, I don't like the fact it basically opts out of all of the combines which might further improve the lowering. Philip On 12/29/2016 11:35 AM, Zaara Syeda via llvm-dev wrote: > > Currently on PowerPC, calls to memcmp are not expanded and are left as > library calls. In certain conditions, expansion can improve > performance rather than calling the library function as done for > functions like memcpy, memmove, etc. This patch...

...nsion that isn’t target specific if other targets would benefit from a more general infrastructure. Please provide feedback if this approach should be continued to implement the PowerPC specific memcmp expansions or whether the community is interested in devising a more general approach. Thanks, Zaara Syeda -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161229/1990fc64/attachment.html>

...ine 1032 of lib/IR/LegacyPassManager.cpp: Pass *AnalysisPass = PI->createPass();<br>AnalysisPass is then passed to addLowerLevelRequiredPass, which does not make use of it. It seems that I’m exposing some problem with the LegacyPassManager.<br><br>Thanks,</div> <div>Zaara</div></div></div><BR>