similar to: Usage of the jumptable attribute

Hi all, I'm a beginner in LLVM. I read a paper recently, and I'm trying to use LLVM jumptable in 3.5. When I compile the .bc file into .s file, I tried to use the different jumptable type: all, single, ... e.g. clang -c -emit-llvm test.c llc test.bc -jump-table-type=full -o test-full.s llc test.bc -jump-table-type=single -o test-single.s The tested C source code is like: void foo() {

Hello, Depending on how I extract integer lanes from an x86_64 xmm register, the backend may spill that register in order to load scalars. The effect was observed on two targets: corei7-avx and btver1 (I haven't checked other targets). Here's a test case with spilling/no-spilling code put on conditional compile: #if __SSE4_1__ != 0 #include <smmintrin.h> #else #include

Hi llvm developers, I might be overlooking something, but I think the ARMConstantIsland pass uses the wrong size for the MachineInstrs representing jump tables: Currently, there is the following calculation in doInitialJumpTablePlacement (lib/Target/ARM/ARMConstantIslandPass.cpp:588): ---------------------------------------------------------------------- unsigned Size = JT[JTI].MBBs.size() *

On Tue, Apr 4, 2017 at 12:36 PM, Duncan P. N. Exon Smith < dexonsmith at apple.com> wrote: > > On 2017-Apr-04, at 12:12, Peter Collingbourne <peter at pcc.me.uk> wrote: > > On Mon, Apr 3, 2017 at 8:13 PM, Mehdi Amini <mehdi.amini at apple.com> wrote: > >> >> On Apr 3, 2017, at 7:08 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: >>

On Wed, Apr 02, 2014 at 05:28:04PM -0700, Tom Roeder wrote: > On Fri, Mar 21, 2014 at 1:46 PM, Peter Collingbourne <peter at pcc.me.uk>wrote: > > > On Fri, Mar 21, 2014 at 12:54:07PM -0700, Tom Roeder wrote: > > > On Fri, Mar 21, 2014 at 12:15 PM, Peter Collingbourne <peter at pcc.me.uk> > > wrote: > > > >> The way I've implemented it (see

Hi, this is a proposal for the implementation of CFI-icall [1] with ThinLTO. Jumptables are generated in the merged module. To generate a jumptable, we need a list of functions with !type annotations, including (in non-cross-dso mode) external functions. Unfortunately, LLVM IR does not preserve unused function declarations, and we don’t want to copy the actual function bodies to the merged

On Thu, Apr 03, 2014 at 06:54:55PM -0700, Reid Kleckner wrote: > I think it's a little scary to assume things about LLVM's x86 code > generation. I haven't really finished the codegen side of the change, but > I'm pretty sure in it's current state it will emit extra loads and stores, > even if they are unnecessary. Right, I had similar concerns. Now that I've

On Fri, Mar 21, 2014 at 12:54:07PM -0700, Tom Roeder wrote: > On Fri, Mar 21, 2014 at 12:15 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: > >> The way I've implemented it (see the patch I sent to llvm-commits > >> yesterday), it's not just metadata: the intrinsic lowers to the > >> jumptable entry code given above. The CFI pass then generates a

On Mon, May 15, 2017 at 6:44 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: > Thanks for sending this out. A few comments below. > > On Mon, May 15, 2017 at 5:17 PM, Evgenii Stepanov via llvm-dev > <llvm-dev at lists.llvm.org> wrote: >> >> Hi, >> >> this is a proposal for the implementation of CFI-icall [1] with ThinLTO. >> >>

On Tue, May 23, 2017 at 4:39 PM, Evgenii Stepanov <eugeni.stepanov at gmail.com > wrote: > On Tue, May 16, 2017 at 4:33 PM, Evgenii Stepanov > <eugeni.stepanov at gmail.com> wrote: > > On Mon, May 15, 2017 at 6:44 PM, Peter Collingbourne <peter at pcc.me.uk> > wrote: > >> Thanks for sending this out. A few comments below. > >> > >> On

On Thu, Mar 20, 2014 at 3:29 PM, Peter Collingbourne <peter at pcc.me.uk> wrote: > > On Mon, Mar 17, 2014 at 10:28:52AM -0700, Tom Roeder wrote: > > On Tue, Feb 25, 2014 at 5:41 PM, Eric Christopher <echristo at gmail.com>wrote: > > > > > On Mon, Feb 24, 2014 at 4:33 PM, Tom Roeder <tmroeder at google.com> wrote: > > > > > > > >

hello everyone, I few days ago I had some code (for the PyPy project) that llc - march=c converted to a switch statement and gcc compiled that nicely to a jumptable in the .s file. Now I try to reproduce when directly going from a .ll to a .s file. But I now see a long list of compare and jumps instead of the jumptable. Is there a transformation that does this if->switch(ing) or is

On Sun, Jun 7, 2009 at 11:53 PM, Evan Cheng <evan.cheng at apple.com> wrote: > > On Jun 7, 2009, at 6:59 AM, robert muth wrote: > >> On Sat, Jun 6, 2009 at 4:51 PM, Evan Cheng<evan.cheng at apple.com> >> wrote: >>> +cl::opt<std::string> FlagJumpTableSection("jumptable-section", >>> +                                          

On Jun 8, 2009, at 2:42 PM, robert muth wrote: > On Sun, Jun 7, 2009 at 11:53 PM, Evan Cheng <evan.cheng at apple.com> > wrote: >> >> On Jun 7, 2009, at 6:59 AM, robert muth wrote: >> >>> On Sat, Jun 6, 2009 at 4:51 PM, Evan Cheng<evan.cheng at apple.com> >>> wrote: >>>> +cl::opt<std::string>

On Sat, Jun 6, 2009 at 4:51 PM, Evan Cheng<evan.cheng at apple.com> wrote: > +cl::opt<std::string> FlagJumpTableSection("jumptable-section", > +                                           cl::init(".data.jtab")); > + I thought it would be nice to group all the jumptables together. But as long as it stays configurable, I am fine to change the default to

On 11 Feb 2014, at 08:15, Eric Christopher <echristo at gmail.com> wrote: > On Mon, Feb 10, 2014 at 11:51 PM, Reid Kleckner <rnk at google.com> wrote: >> >> >> >> IIRC this came up before, and I don't think we expose anything like a jump >> table at the IR level. As an IR-to-IR transform, I think asm is the only >> way to do it. >

Hi, all I am interested in how jump-table representated in DAG. I find the method visitJumpTable will Emit JumpTable node in the current MBB. visitJumpTableHeader - This function emits necessary code to produce index in the JumpTable from switch case. but how switch case emits? I would like to make this clearly. Thanks, yaoxiao -------------- next part -------------- An HTML attachment

Hello LLVM, I am following the document "Writing an LLVM Pass". When I ran "opt -load ../../../Debug/lib/MyPass.so -mypass < hello.bc > /dev/null" I got the next error: ***@ubuntu:~/test$ opt -load ../../llvm/Debug/lib/MyPass.so -mypass < hello.bc > /dev/null opt: Pass.cpp:159: void<unnamed>::PassRegistrar::RegisterPass(const llvm::PassInfo&): Assertion

On Thu, Jun 25, 2009 at 6:17 PM, Bob Wilson <bob.wilson at apple.com> wrote: > Hi Robert, > Evan asked me to review this patch, and I have some questions about it. I > apologize for not following the discussion earlier and for hitting you with > questions after you've already gone through several revisions. > > LLVM provides some default behavior for handling jump

Hello, I need to analyze dependencies in my llvm ir by using polly. i created a new pass called mypass there i added polly dependency analysis pass but when i execute this pass in gdb i get no data. Why is that so? My code is follows; namespace { struct mypass : public FunctionPass { static char ID; mypass() : FunctionPass(ID) { } virtual bool runOnFunction(Function &F) {