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LLVM seems to be generating way too complex of branching based on the short-circuit optimization. The code in question is as follows: define void @ test_fc_while_and(float %x, float %y, float addrspace(11)* %result) nounwind { entry: %tobool3 = fcmp une float %x, 0.000000e+000 ; <i1> [#uses=1] %tobool24 = fcmp une float %y, 0.000000e+000 ;

On Wed, Oct 1, 2008 at 1:19 PM, Villmow, Micah <Micah.Villmow at amd.com> wrote: > LLVM seems to be generating way too complex of branching based on the > short-circuit optimization. The code in question is as follows: > > define void @ test_fc_while_and(float %x, float %y, float addrspace(11)* > %result) nounwind { > > entry: > > %tobool3 = fcmp une float

Hello, I am new here. This is my first post. I spent about three days on trying out LLVM by developing a front-end which is able to generate LLVM IR for a subset of C language. I have not applied any optimization pass yet. On linux, it can go all the way through with the system native assemlber and linker to generate executables. And it runs. I ran into problems on Windows since the generated

When zig updated to llvm 5 we started hitting this assertion: zig: /home/andy/downloads/llvm-project/llvm/include/llvm/Support/Casting.h:106: static bool llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::Instruction; From = llvm::Value]: Assertion `Val && "isa<> used on a null pointer"' failed. I wonder if however this was caused by an

Can you please open a bug on bugzilla and attach the ir testcase? Your fix doesn't look right (just hiding the assertion failure) On Sep 17, 2017 10:45 AM, "Andrew Kelley via llvm-dev" < llvm-dev at lists.llvm.org> wrote: > What do you think about this patch? > > --- a/llvm/lib/Transforms/Scalar/NewGVN.cpp > +++ b/llvm/lib/Transforms/Scalar/NewGVN.cpp > @@

So, 90% of the time I've seen this, it was memory corruption, usually use after free. I know I fixed one after 5.0 branched. You should compile with address sanitizer enabled, and I suspect you will find the issue quicky. If not, we really need ir that reproduces it. On Sun, Sep 17, 2017, 12:27 PM Andrew Kelley via llvm-dev < llvm-dev at lists.llvm.org> wrote: > I think I forgot to

Dump the IR before newgvn and run through opt -newgvn. It should crash. I'm not familiar with your frontend but you might want to use -mllvm -opt-bisect-limit. On Sep 17, 2017 1:06 PM, "Andrew Kelley" <superjoe30 at gmail.com> wrote: Valgrind is strictly better than address sanitizer, is that right? It runs valgrind-clean: [nix-shell:~/dev/zig/build-llvm5-debug]$ valgrind