similar to: [LLVMdev] GCC Atomic NAND implementation

the clang 3.5 loop optimizer seems to jump in unintentional for simple loops the very simple example ---- const int SIZE = 3; int the_func(int* p_array) { int dummy = 0; #if defined(ITER) for(int* p = &p_array[0]; p < &p_array[SIZE]; ++p) dummy += *p; #else for(int i = 0; i < SIZE; ++i) dummy += p_array[i]; #endif return dummy; } int main(int argc, char** argv) {

Hi I have some inline function C code, that llvm could be optimizing better. Since I am new to this, I wonder if someone could give me a few pointers, how to approach this in LLVM. Should I try to change the IR code -somehow- to get the code generator to generate better code, or should I rather go to the code generator and try to add an optimization pass ? Thanks for any feedback. Ciao

Am 03.03.2015 um 19:49 schrieb Philip Reames <listmail at philipreames.com>: Hi Philip first thanks for your response, > You'll need to prove a bit more information to get any useful response. Questions: > 1) What's you're use case? Are you using clang to compile C code? Are you manually generating LLVM IR? yes the "inline function C code" will be compiled

Sure. Attached is the file but here are the functions. The first uses a fixed bit offset. The second has a indexed bit offset. Compiling with llc -O3, LLVM version 3.7.0svn, it compiles the IR from IsBitSetB() using btq %rsi, %rdi. Good. But then it compiles IsBitSetA() with shrq/andq, which is is pretty much what Clang had generated as IR. shrq $25, %rdi andq $1, %rdi LLVM should be able to

plain text document attachment (xx-paravirt-processor-header.patch) System routine updates for the paravirt_ops interface. Signed-off-by: Steven Rostedt srostedt@redhat.com Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Index: clean-start/include/asm-x86_64/processor.h =================================================================== ---

plain text document attachment (xx-paravirt-processor-header.patch) System routine updates for the paravirt_ops interface. Signed-off-by: Steven Rostedt srostedt@redhat.com Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Index: clean-start/include/asm-x86_64/processor.h =================================================================== ---

> On Jan 22, 2015, at 1:22 PM, Fiona Glaser <fglaser at apple.com> wrote: > > According to Agner’s docs, many CPUs have slower BT than TEST; Haswell has only 0.5 inverse throughput as opposed to 0.25, Atom has 1 instead of 0.5, and Silvermont can’t even dual-issue BT (it locks both ALUs). So while BT does seem have a shorter instruction encoding than TEST for TEST reg, imm32 where

On 12/22/2015 05:07 PM, Stefan Hajnoczi wrote: > This series is based on v4.4-rc2 and the "virtio: make find_vqs() > checkpatch.pl-friendly" patch I recently submitted. > > v4: > * Addressed code review comments from Alex Bennee > * MAINTAINERS file entries for new files > * Trace events instead of pr_debug() > * RST packet is sent when there is no listen

Just prior to the time change, I made sure that ntpd and my timezone files were properly setup. Since this time, I've noticed the following errors: audit(1173310084.404:5): avc: denied { read } for pid=8634 comm="ntpd" name="unexpected.tdb" dev=md1 ino=147662 scontext=root:system_r:ntpd_t tcontext=root:object_r:samba_var_t tclass=file I've not successfully (so

Moritz Muehlenhoff writes ("Re: Xen package security updates for jessie 4.4, XSA-213, XSA-214"): > Yes, the distribution line should be jessie-security, but please send > a debdiff to team at security.debian.org for a quick review before > uploading (I have no idea whether dgit supports security-master). Here is the proposed debdiff (actually, a git diff) for xen in jessie. My

Hi Folks, I have a question regarding LLD support for ld64 mach-o linker synthesised symbols. I did a quick search of the LLD source and I can not find support for them so before I start trying to use lld I thought I would ask. I have found a couple of cases where they are essential. i.e. where there is no other way to get the required information, such as getting the address of the mach-o

Hi All, I used to always do a minimal install with v4.4, and wget (and other tools) was included. With v5 if i untick *everything* in the installation (incl "base") so that i can install from 1 cd, wget is not included. I couldn't make sense of any of the xml or xml.gz files on the installation cd. (/dev/cdrom/repodata/*), although they do mention wget as 'default'

Alle, Does anyone have any experience with with Netgear WG511v2 cards and V4.4? I read the post @ http://www.centos.org/modules/newbb/viewtopic.php?topic_id=4600&forum=30&post_id=13268#forumpost13268 but the system doesn't even seem to see the card. "/sbin/cardctl ident" shows no info on slot 0/1. "/sbin/modprobe prism54" comes back with nothing. I thought

I'm sure that this has been asked and answered already, but I can't find it. I have been able to get wine to run Freddi Fish 3 for my daughter but after starting up, showing the splash screen and starting the game, the game dies with the error... "Cannot get the sound card driver to accept the sound clip" or something along those lines. The strange thing is that it has been

Greetings list, I had a quick spin through the archives and don't see any discussion on this question: Is there a reason why the ia64 download directories for v4.4 are populated with links to 4.3? (And why the torrent files for v4.3 ia64 don't work?) Now, instead of the symptom, I'll describe my actual problem. Has anyone successfully installed CentOS (any flavor, although I

Hi Rui, The motivation would be primarily that LLVM/Clang/LLD are community projects such that if I or someone in the community added support for e.g. symbol aliases, then it could be reviewed and potentially merged. ld64 on the other hand does not have a community process for patch submission and code review that I am aware of so its unlikely that if someone from the community came up with a

On Sat, Dec 3, 2016 at 3:56 PM, Hahnfeld, Jonas <Hahnfeld at itc.rwth-aachen.de> wrote: > Hi Sedat, > > as already said multiple times for the past releases: The tarballs will be > uploaded once they are finished. The tagged version currently gets tested > which is done with an export from SVN AFAIK. > > Please just be patient and give the process some time, With the

Hello We have a problem with our Windows 10 Clients. Installed on a SLES12 Server is samba v4.4 I can bind the clients to the domain without any problem. Afterwards I want to login in the domain, I get the error, no logonserver available I can change in the smb conf max protocol to NT1 -> now it is possible to login with user xxx in the domain We don't want to use our samba server

(Maybe this is a re-posting: sorry for that.) Hello, a SonicWALL appliance that protects my servers' LAN has suddenly begun to refuse OpenSSH connections with the following message: 'SSH 2.0 Overly Long Protocol Version Exchange String, SID: 3696, Priority: High - This signature detects overly long "Protocol Version Exchange" string in SSH 2.0. The maximum length of the

When a Snom 200 (v2.1l) calls a C7960 (v4.4), both using g711u as default, the conversation is extremely noisy from the Snom to the Cisco, but clear in the reverse direction. Using a sniffer, I see packets from the Snom to the Cisco of 87 bytes and Cisco to Snom of 214 bytes. Asterisk is CVS from Saturday. The communications between the two was working fine on Saturday, however something has