similar to: [LLVMdev] [patch] llvm-gcc support for packed structures

Currently, Structure layout is left to targets, which implement them according to the ABI of that platform. While this is fine for most structures, it makes packed structures very ugly. All fields in a packed type must be converted to byte arrays with casts to access fields, which bloats accesses and obsfucates the types. First class support for packed types would clean up the generated code

On Dec 6, 2006, at 10:44 AM, Andrew Lenharth wrote: > Currently, Structure layout is left to targets, which implement them > according to the ABI of that platform. While this is fine for most > structures, it makes packed structures very ugly. All fields in a > packed type must be converted to byte arrays with casts to access > fields, which bloats accesses and obsfucates the

On Thu, 2006-12-07 at 22:00 -0800, Chris Lattner wrote: > On Dec 6, 2006, at 10:44 AM, Andrew Lenharth wrote: > > > Currently, Structure layout is left to targets, which implement them > > according to the ABI of that platform. While this is fine for most > > structures, it makes packed structures very ugly. All fields in a > > packed type must be converted to byte

On 12/8/06, Chris Lattner <clattner at apple.com> wrote: > This patch isn't sufficient for two reasons: 1) it will turn structs that > don't need to be packed into packed llvm structs. 2) it won't turn some > that should be packed llvm structs into packed structs (e.g. strange ABI > considerations force a field to be unaligned, not an attribute at the source >

On Dec 6, 2006, at 1:58 PM, Andrew Lenharth wrote: > The attached patch (gcc.patch) implements the gcc portion of packed > types. I have only tested this on a few examples, so I may be missing > some type conversions somewhere. > > The gcc patch requires llvm_extra.patch, not included in the > previous emails. > > Andrew > <llvm_extra.patch> llvm_extra.patch

The attached patch (gcc.patch) implements the gcc portion of packed types. I have only tested this on a few examples, so I may be missing some type conversions somewhere. The gcc patch requires llvm_extra.patch, not included in the previous emails. Andrew -------------- next part -------------- A non-text attachment was scrubbed... Name: llvm_extra.patch Type: text/x-patch Size: 1677 bytes

Dear LLVMers, I have a question on packed structures in LLVM 2.6. Is it possible to place an unpacked structure type as a member within a packed structure type? What I want to do is to have the fields of an inner structure padded per the ABI but have the elements of the outer structure packed. Thanks in advance. -- John T.

Attached is a cleaned up patch. Andrew -------------- next part -------------- A non-text attachment was scrubbed... Name: packed.patch Type: text/x-patch Size: 12700 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20061206/26110f77/attachment.bin>

Currently the virtio_ring structure are not declared packed, but they describe an hardware like interface. We should not allow compilers to make alignments and optimizations that can be different between the guest and host compiler. I propose to declare all structures that are in shared memory as packed. Does anybody see a problem with packed? Signed-off-by: Christian Borntraeger

Currently the virtio_ring structure are not declared packed, but they describe an hardware like interface. We should not allow compilers to make alignments and optimizations that can be different between the guest and host compiler. I propose to declare all structures that are in shared memory as packed. Does anybody see a problem with packed? Signed-off-by: Christian Borntraeger

Attached is a patch to support atomic compare and swap, load add store, and swap. These I think should be a sufficient minimal set of atomic intrinsics. Only Alpha has codegen support for all intrinsics (hey, alpha has to have something shiny and new occasionally). X86 is a matter of implementing the various xchange instructions and the lock prefix (by someone more familiar with that .td file

On Wed, Nov 21, 2018 at 06:03:17PM +0800, Tiwei Bie wrote: > Hi, > > This patch set implements packed ring support in virtio driver. > > A performance test between pktgen (pktgen_sample03_burst_single_flow.sh) > and DPDK vhost (testpmd/rxonly/vhost-PMD) has been done, I saw > ~30% performance gain in packed ring in this case. > > To make this patch set work with below

On Wed, Nov 21, 2018 at 06:03:17PM +0800, Tiwei Bie wrote: > Hi, > > This patch set implements packed ring support in virtio driver. > > A performance test between pktgen (pktgen_sample03_burst_single_flow.sh) > and DPDK vhost (testpmd/rxonly/vhost-PMD) has been done, I saw > ~30% performance gain in packed ring in this case. Thanks a lot, this is very exciting! Dave, given

On Fri, Sep 07, 2018 at 10:03:24AM -0400, Michael S. Tsirkin wrote: > On Wed, Jul 11, 2018 at 10:27:08AM +0800, Tiwei Bie wrote: > > This commit introduces the support for creating packed ring. > > All split ring specific functions are added _split suffix. > > Some necessary stubs for packed ring are also added. > > > > Signed-off-by: Tiwei Bie <tiwei.bie at

Commit-ID: b4f1a2bfe64cd0d8dc58c0b7173745f3c1af0bb3 Gitweb: http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=b4f1a2bfe64cd0d8dc58c0b7173745f3c1af0bb3 Author: Ben Hutchings <ben at decadent.org.uk> AuthorDate: Sat, 28 Mar 2020 22:17:36 +0000 Committer: Ben Hutchings <ben at decadent.org.uk> CommitDate: Sat, 28 Mar 2020 22:33:26 +0000 [klibc] nfsmount: Fix alignment of

On Mon, Sep 10, 2018 at 10:28:37AM +0800, Tiwei Bie wrote: > On Fri, Sep 07, 2018 at 10:03:24AM -0400, Michael S. Tsirkin wrote: > > On Wed, Jul 11, 2018 at 10:27:08AM +0800, Tiwei Bie wrote: > > > This commit introduces the support for creating packed ring. > > > All split ring specific functions are added _split suffix. > > > Some necessary stubs for packed

On Wed, Nov 21, 2018 at 07:20:27AM -0500, Michael S. Tsirkin wrote: > On Wed, Nov 21, 2018 at 06:03:17PM +0800, Tiwei Bie wrote: > > Hi, > > > > This patch set implements packed ring support in virtio driver. > > > > A performance test between pktgen (pktgen_sample03_burst_single_flow.sh) > > and DPDK vhost (testpmd/rxonly/vhost-PMD) has been done, I saw

I tried with bugpoint, but it still give a large code. I have attached the bugpoint output file. ---- Original message ---- >Date: Fri, 1 Dec 2006 12:57:55 -0600 >From: "Andrew Lenharth" <andrewl at lenharth.org> >Subject: Re: [LLVMdev] DSGraph::computeCalleeCallerMapping failing >To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu> >

I'm trying to determine how to do my packed structure compilation and am a bit unclear about how packed structures are handled. Consider this structure: %struct.packed = type <{ i8, i32 }> Now if I get a pointer to the i32 element the pointer will not be properly aligned for a typical i32. On my current machine (x86_64) the cpu doesn't seem to care, but I suspect this isn't

Hi edA-qa mort-ora-y, On 12/05/13 17:13, edA-qa mort-ora-y wrote: > I'm trying to determine how to do my packed structure compilation and am > a bit unclear about how packed structures are handled. Consider this > structure: > > %struct.packed = type <{ i8, i32 }> > > Now if I get a pointer to the i32 element the pointer will not be > properly aligned for a