search for: dllvm_build_instrumented_coverage

On 6/27/2017 1:47 PM, Xinliang David Li wrote: > > > On Mon, Jun 26, 2017 at 7:24 PM, Friedman, Eli > <efriedma at codeaurora.org <mailto:efriedma at codeaurora.org>> wrote: > > On 6/19/2017 7:29 PM, Vedant Kumar wrote: >> >>>> We can reduce testing time by *not* instrumented basic tools >>>> like count, not, FileCheck etc. I

On 6/19/2017 7:29 PM, Vedant Kumar wrote: > >>> We can reduce testing time by *not* instrumented basic tools like >>> count, not, FileCheck etc. I filed: llvm.org/PR33501 >>> <http://llvm.org/PR33501>. >>> >>>> 3. The generated profile information takes up a lot of space: llc >>>> generates a 90MB profraw file. >>>

I've started looking at the state of code coverage recently; we figured LLVM itself would be a good test to figure out how mature it is, so I gave it a shot. My experience: 1. You have to specify -DLLVM_USE_LINKER=gold (or maybe lld works; I didn't try). If you link with binutils ld, the program will generate broken profile information. Apparently, the linked binary is missing the

I had an old build of llc with FE instrumentation, the name section size is about 5MB. Using coverage is likely to cause the name section to be larger as there are more references to dead/unused function names. What do you see when readelf --string-dump=__llvm_prf_names llc David On Tue, Jun 27, 2017 at 2:23 PM, Xinliang David Li <davidxl at google.com> wrote: > > > On Tue,

On 6/18/2017 3:51 PM, Vedant Kumar wrote: >> My experience: >> >> 1. You have to specify -DLLVM_USE_LINKER=gold (or maybe lld works; I >> didn't try). If you link with binutils ld, the program will generate >> broken profile information. Apparently, the linked binary is missing >> the __llvm_prf_names section. This took me half a day to figure out.

With llc, the size of the names section can vary widely depending on the value of -DLLVM_TARGETS_TO_BUILD. Enabling coverage shouldn't increase the name section size much. I only see one place where this happens, and it's relatively cold: http://lab.llvm.org:8080/coverage/coverage-reports/llvm/coverage/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R at