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...threaded execution: introducing a store to a > byte which might not otherwise be stored to can introduce undefined > behavior.... " > > Why is introducing additional loads allowed? For example, in a program > that already contains two unordered stores to a location l, if we > introduced an unordered load to l, then the load cannot see more than > one stores, it must return undef. The intent of the model is that if the behavior of a program doesn't depend on the value of a load, it's okay if it is undef. This allows, for example, hoisting loads which are conditionally...

...oducing a store to a >> byte which might not otherwise be stored to can introduce undefined >> behavior.... " >> >> Why is introducing additional loads allowed? For example, in a program >> that already contains two unordered stores to a location l, if we >> introduced an unordered load to l, then the load cannot see more than >> one stores, it must return undef. > > The intent of the model is that if the behavior of a program doesn't > depend on the value of a load, it's okay if it is undef.  This allows, > for example, hoisting loads w...

On Sun, Mar 1, 2020 at 1:32 PM Michael S. Tsirkin <mst at redhat.com> wrote: > > On Sun, Mar 01, 2020 at 01:07:30PM +0200, Yuri Benditovich wrote: > > This series introduce virtio-net features VIRTIO_NET_F_RSC_EXT, > > VIRTIO_NET_F_RSS and VIRTIO_NET_F_HASH_REPORT. > > > > Changes from v1: > > __virtio -> __le > > maximal -> maximum > >

...is initialized. The expection is .gem_prime_mmap. There are different > ways of how drivers implement the callback, and moving it to GEM object > functions requires a closer review for each. > > Patch #17 fixes virtgpu to use GEM object functions where possible. The > driver recently introduced a function for one of the deprecated callbacks. > > Patch #20 converts xlnx to CMA helper macros. There's no apparent reason > why the driver does the GEM setup on it's own. Using CMA helper macros > adds GEM object functions implicitly. > > With most of the GEM and PRIME...

...l issue deploying the new PM, but it does point to a latent theoretical issues as well. I see various ways to address it, but want feedback from others before moving forward. The issue is that we can introduce out-of-thin-air calls to known library functions (`SimplifyLibCalls`, etc). These can be introduced in function passes (`InstCombine` in particular) and that seems highly desirable. These all look like one of these cases: 1a) Introducing a new call to an LLVM intrinsic 1b) Replacing an existing call with a call to an LLVM intrinsic 2a) Introducing a new call to a declared library function (but n...

...ecause DAGCombiner is introducing an illegal node after the legalizeDAG phase. Basically this is what is going on: 1) During legalization, BR_JT gets expanded introducing a (mul x, 2). 2) After legalization (AfterLegalizeDAG), that (mul x, 2) is converted to an (shl x, 1). However, that shl node introduced is illegal, and since my custom lowering code won't run after this phase it gets into the instruction selector. I would like to know if this is really a bug or it has to be handled by the target code. I guess I could add a custom dagcombine hook for this node and revert it in my target, but I w...

...is initialized. The expection is .gem_prime_mmap. > There are different ways of how drivers implement the callback, and moving > it to GEM object functions requires a closer review for each. > > Patch #18 fixes virtgpu to use GEM object functions where possible. The > driver recently introduced a function for one of the deprecated callbacks. > > Patches #7 and #20 convert i.MX's dcss and xlnx to CMA helper macros. There's > no apparent reason why the drivers do the GEM setup on their's own. Using CMA > helper macros adds GEM object functions implicitly. > > W...

...> > and I agree entirely, see the following " 2 x 2 " comparison : > > > N <- 5000000000000 * 8^-(0:7) > > as.integer(N) > [1] NA NA NA NA 1220703125 152587890 19073486 2384185 > Warning message: > NAs introduced by coercion > > as.integer(-N) > [1] NA NA NA NA -1220703125 -152587890 -19073486 > [8] -2384185 > Warning message: > NAs introduced by coercion > > as.integer(as.character(N)) > [1] 2147483647 2147483647 2147...

...what is required for single-threaded execution: introducing a store to a byte which might not otherwise be stored to can introduce undefined behavior.... " Why is introducing additional loads allowed? For example, in a program that already contains two unordered stores to a location l, if we introduced an unordered load to l, then the load cannot see more than one stores, it must return undef. The question is whether the memory model takes the two unordered stores as a data race that has already makes the program's behavior undefined. But the spec does not make this point clear. My second q...

Hi. Im exploring `opt -reg2mem` output for a simple C program (actually, that is this snippet: http://rosettacode.org/wiki/Dining_philosophers#C - compiled with clang -O1) and got two questions regarding this pass. 1. How would I tell which memory locations were introduced by the pass, and which memory locations were present in the original program? After a brief diffing of .ll files, I'd suppose that introduced "alloca"s would put their result in a variable named "somename.reg2mem". But is the ".reg2mem" suffix a reliable way to ide...

On Wed, Mar 22, 2023 at 11:03:00AM +0800, Xuan Zhuo wrote: > Due to historical reasons, the implementation of XDP in virtio-net is relatively > chaotic. For example, the processing of XDP actions has two copies of similar > code. Such as page, xdp_page processing, etc. > > The purpose of this patch set is to refactor these code. Reduce the difficulty > of subsequent maintenance.

On Wed, Feb 05, 2020 at 03:50:14PM +0800, Jason Wang wrote: > > On 2020/2/5 ??3:15, Shahaf Shuler wrote: > > Wednesday, February 5, 2020 4:03 AM, Tiwei Bie: > > > Subject: Re: [PATCH] vhost: introduce vDPA based backend > > > > > > On Tue, Feb 04, 2020 at 11:30:11AM +0800, Jason Wang wrote: > > > > On 2020/1/31 ??11:36, Tiwei Bie wrote: >

The Wine development release 5.6 is now available. What's new in this release (see below for details): - Still more Media Foundation work. - Improvements to Active Directory LDAP support. - A few more modules converted to PE. - Improvements to gdb proxy mode. - Various bug fixes. The source is available from the following locations:

On Wed, Mar 22, 2023 at 11:40:56AM +0800, Xuan Zhuo wrote: > On Tue, 21 Mar 2023 23:34:43 -0400, "Michael S. Tsirkin" <mst at redhat.com> wrote: > > On Wed, Mar 22, 2023 at 11:03:00AM +0800, Xuan Zhuo wrote: > > > Due to historical reasons, the implementation of XDP in virtio-net is relatively > > > chaotic. For example, the processing of XDP actions has

On Tue, 21 Mar 2023 19:58:49 +0800, Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote: > On Wed, 15 Mar 2023 12:10:34 +0800, Xuan Zhuo <xuanzhuo at linux.alibaba.com> wrote: > > Due to historical reasons, the implementation of XDP in virtio-net is relatively > > chaotic. For example, the processing of XDP actions has two copies of similar > > code. Such as page,

On Fri, 24 Apr 2015 15:31:54 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Fri, Apr 24, 2015 at 02:24:15PM +0200, Greg Kurz wrote: > > Only cosmetic and documentation changes since v5. > > > > --- > > Looks sane to me. I plan to review and apply next week. > Hi Michael, I realize you just got back and have tons of things to do... Do

On Fri, 24 Apr 2015 15:31:54 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Fri, Apr 24, 2015 at 02:24:15PM +0200, Greg Kurz wrote: > > Only cosmetic and documentation changes since v5. > > > > --- > > Looks sane to me. I plan to review and apply next week. > Hi Michael, I realize you just got back and have tons of things to do... Do

...2 x 2 " comparison : >>> >>> > N <- 5000000000000 * 8^-(0:7) >>> > as.integer(N) >>> [1] NA NA NA NA 1220703125 152587890 19073486 2384185 >>> Warning message: >>> NAs introduced by coercion >>> > as.integer(-N) >>> [1] NA NA NA NA -1220703125 -152587890 -19073486 >>> [8] -2384185 >>> Warning message: >>> NAs introduced by coercion >>> > as.integer(a...

...will have a lot of changes in clang tests. *Replacing Undef with Poison* --------------------------- Since undef is known to be the source of many optimizations due to its complexity, we'd like to suggest gradually moving towards using poison only. To make it, (1) `poison` constant should be introduced into LLVM IR first, and (2) transformations that introduce `undef` should be updated to introduce `poison` instead. For the step (2), we need an experimental result showing that it does not cause performance degradation. This relies on better support for freeze (the no-undef/poison analysis patche...

This series introduce virtio-net features VIRTIO_NET_F_RSC_EXT, VIRTIO_NET_F_RSS and VIRTIO_NET_F_HASH_REPORT. Changes from v1: __virtio -> __le maximal -> maximum minor style fixes Yuri Benditovich (3): virtio-net: Introduce extended RSC feature virtio-net: Introduce RSS receive steering feature virtio-net: Introduce hash report feature include/uapi/linux/virtio_net.h | 90