search for: tailmerging

Hi everyone, The code layout that TailMerging (inside BranchFolding) works on is not the final layout optimized based on the branch probability. Generally, after BlockPlacement, many new merging opportunities emerge. I did an experiment of adding additional BranchFolding and BlockPlacement after the existing BlockPlacement (i.e., -block-p...

Hi, I am building llvm 3.3 with cmake on PPC64 and have a bunch of regression test failures. With only PPC backend enabled the list of failures is: [ 1553s] Failing Tests (20): [ 1553s] LLVM :: CodeGen/PowerPC/2007-05-22-tailmerge-3.ll [ 1553s] LLVM :: CodeGen/PowerPC/2007-09-08-unaligned.ll [ 1553s] LLVM :: CodeGen/PowerPC/2008-07-24-PPC64-CCBug.ll [ 1553s] LLVM ::

After some head scratching and debugging it turns out that disabling shared libs fixes the problem. This might be related to http://llvm.org/bugs/show_bug.cgi?id=13124 . It would be nice to get this finally fixed otherwise cmake + shared libs is no go. Thanks. On Mon, Aug 5, 2013 at 11:54 AM, İsmail Dönmez <ismail at donmez.ws> wrote: > Hi, > > I am building llvm 3.3 with cmake

On Oct 18, 2011, at 3:07 PM, Chandler Carruth wrote: > On Tue, Oct 18, 2011 at 2:59 PM, Cameron Zwarich <zwarich at apple.com> wrote: > I think this should really live as a CodeGen pass. Is there any good reason to make it an IR pass? > > So, as it happens, I was *completely* wrong here. CodeGen correctly preserves the ordering of blocks from IR, *unless* it can do folding,

On Tue, Oct 18, 2011 at 2:59 PM, Cameron Zwarich <zwarich at apple.com> wrote: > On Oct 18, 2011, at 2:53 AM, Chandler Carruth wrote: > > > Hello, > > > > I'm working on basic-block placement optimizations based on branch > probability information. I've run into a stumbling block though. One of the > existing passes to do this, essentially a dead pass

I've ran across an issue in BranchFolding.cpp where it is incorrectly folding a branch to the wrong fallthrough location. This is in LLVM 2.4 and seems to be in 2.5 also. The code in question is: void BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) { MachineFunction::iterator FallThrough = MBB; ++FallThrough; // If this block is empty, make everyone use its fall-through, not

On Tue, Oct 18, 2011 at 4:31 PM, Jakob Stoklund Olesen <stoklund at 2pi.dk>wrote: > > On Oct 18, 2011, at 3:07 PM, Chandler Carruth wrote: > > On Tue, Oct 18, 2011 at 2:59 PM, Cameron Zwarich <zwarich at apple.com>wrote: > >> I think this should really live as a CodeGen pass. Is there any good >> reason to make it an IR pass? >> > > So, as it

Hi, I've bootstrapped llvm/clang from svn-trunk on powerpc-darwin8 (g++-4.0.1), and have the following test results to share. Summary below, full log at: http://www.csl.cornell.edu/~fang/sw/llvm/r146586-powerpc-darwin8-results.txt The only edits required were those I posted to llvm-commits yesterday (re: "some missing clang libs"). And I also edited LitConfig.py to point to