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...give to the PassManagerBuilder that it creates. The parsing of those options doesn't exist in any of the llvm library code that is linked into clang. Clang has its own code for populating a PassManagerBuilder in tools/clang/lib/CodeGen/BackendUtil.cpp ~Craig On Mon, Jan 8, 2018 at 10:55 PM, toddy wang via llvm-dev < llvm-dev at lists.llvm.org> wrote: > Mehdi, > > I found -unroll-max-count can be passed w/ -mllvm. > -dce, -adce, etc, are also dumped by 'opt --help-hidden'. However, they > cannot be passed w/ -mllvm. > Is this what "You can't schedul...

//mllvm Options can be dumped by clang -v -help -mllvm and clang -v --help-hidden --> //mllvm Options can be dumped by clang -v -help -mllvm and clang -v --help-hidden -mllvm On Tue, Jan 9, 2018 at 3:09 AM, toddy wang <wenwangtoddy at gmail.com> wrote: > Thanks, Craig. > > So, clang -Xclang -disable-llvm-passes actually disables all the LLVM > passed populated by clang so that there is no middle-end optimization on bc > files. > > clang -O2 LULESH.c //clang is the driver, invoki...

...hat it > creates. The parsing of those options doesn't exist in any of the llvm > library code that is linked into clang. Clang has its own code for > populating a PassManagerBuilder in tools/clang/lib/CodeGen/BackendUtil.cpp > > ~Craig > > On Mon, Jan 8, 2018 at 10:55 PM, toddy wang via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> Mehdi, >> >> I found -unroll-max-count can be passed w/ -mllvm. >> -dce, -adce, etc, are also dumped by 'opt --help-hidden'. However, they >> cannot be passed w/ -mllvm. >> Is this...

2018-01-08 8:59 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > > > On Mon, Jan 8, 2018 at 11:53 AM, Mehdi AMINI <joker.eph at gmail.com> wrote: > >> >> >> 2018-01-08 8:41 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: >> >>> Hi Medhi, >>> >>&gt...

2018-01-08 8:41 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > Hi Medhi, > > It seems -mllvm does not work as expected. Anything wrong? > > [twang15 at c92 temp]$ clang++ -O3 -mllvm *-deadargelim* LULESH.cc > clang (LLVM option parsing): Unknown command line argument > '-deadargelim'. Try...

...M option parsing): Unknown command line argument '-dce'. Try: 'clang (LLVM option parsing) -help' clang (LLVM option parsing): Did you mean '-mv4'? On Mon, Jan 8, 2018 at 12:48 PM, Mehdi AMINI <joker.eph at gmail.com> wrote: > > > 2018-01-08 8:59 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > >> >> >> On Mon, Jan 8, 2018 at 11:53 AM, Mehdi AMINI <joker.eph at gmail.com> wrote: >> >>> >>> >>> 2018-01-08 8:41 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: >>> >>&gt...

On Mon, Jan 8, 2018 at 11:53 AM, Mehdi AMINI <joker.eph at gmail.com> wrote: > > > 2018-01-08 8:41 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > >> Hi Medhi, >> >> It seems -mllvm does not work as expected. Anything wrong? >> >> [twang15 at c92 temp]$ clang++ -O3 -mllvm *-deadargelim* LULESH.cc >> clang (LLVM option parsing): Unknown command line argument >&...

2018-01-07 23:16 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > -mllvm <value> Additional arguments to forward to LLVM's option > processing > > This is dumped by clang. I am not sure what I am supposed to put as value > in order to tune unrolling/inlining threshold. > As the help...

...-O3 -mllvm *deadargelim* LULESH.cc clang (LLVM option parsing): Unknown command line argument 'deadargelim'. Try: 'clang (LLVM option parsing) -help' -Tao On Mon, Jan 8, 2018 at 11:12 AM, Mehdi AMINI <joker.eph at gmail.com> wrote: > > > 2018-01-07 23:16 GMT-08:00 toddy wang <wenwangtoddy at gmail.com>: > >> -mllvm <value> Additional arguments to forward to LLVM's option >> processing >> >> This is dumped by clang. I am not sure what I am supposed to put as value >> in order to tune unrolling/inlining thres...

For the types of things that you are looking for, you may just want to try a bunch of -mllvm options. You can tune inlining and unrolling threshold like that, for example. On Jan 7, 2018 10:33 PM, "toddy wang via llvm-dev" <llvm-dev at lists.llvm.org> wrote: > Hi Mehdi, > > Now we have 5 pipelines. (In addition to the first 3, which I have > described in detail above, please refer my latest reply for details) > 1. clang + opt + gold > 2. clang + opt + lld > 3. clang...

...8, 2018 at 2:02 AM, Sean Silva <chisophugis at gmail.com> wrote: > For the types of things that you are looking for, you may just want to try > a bunch of -mllvm options. You can tune inlining and unrolling threshold > like that, for example. > > On Jan 7, 2018 10:33 PM, "toddy wang via llvm-dev" < > llvm-dev at lists.llvm.org> wrote: > >> Hi Mehdi, >> >> Now we have 5 pipelines. (In addition to the first 3, which I have >> described in detail above, please refer my latest reply for details) >> 1. clang + opt + gold >>...

...marked noinline. > I don't know if there is a command line option to turn that off. > > I recommend passing "-O1 -Xclang -disable-llvm-passes" to clang. Passing > -O0 very specifically means disable optimizations. > > ~Craig > > On Sat, Jan 6, 2018 at 12:25 PM, toddy wang <wenwangtoddy at gmail.com> > wrote: > >> @Craig and @Michael >> >> After installing clang-5.0 (download from http://releases.llvm.org, does >> not have Flang build's slowdown mention above), >> >> 1. clang++ -O0 -Xclang -disable-O0-optnone -...

...ons from "flang" which is a fortran compiler and maintained by different people than the LLVM/clang community? But then compiling C/C++ code? Their bug database should be used for filing bugs against the fortran compiler not a C/C++ compiler issue. ~Craig On Sat, Jan 6, 2018 at 1:04 PM, toddy wang <wenwangtoddy at gmail.com> wrote: > Thanks a lot, it is clear to me now. > > BTW, for Clang's slowdown, I submit an issue here: https://github.com/ > flang-compiler/flang/issues/356 > > I have no idea about the root cause. > Maybe due to debug symbols. But, I a...

Hi Toddy, You can achieve what you're looking for with a pipeline based on `clang -Ox` + `opt -Ox` + `llc -Ox` (or lld instead of llc), but this won't be guarantee'd to be well supported across releases of the compiler. Otherwise, if there are some performance-releated (or not...) command line...

...cceed opt -help-hidden #Succeed opt --help-hidden #Succeed llc -help #Succeed llc --help #Succeed llc -help-hidden #Succeed llc --help-hidden #Succeed lld -help #Succeed lld --help #Succeed lld -help-hidden #Fail (may be no hidden option) lld --help-hidden # Fail On Tue, Jan 9, 2018 at 2:07 AM, toddy wang <wenwangtoddy at gmail.com> wrote: > clang -O3 -mllvm -help -c LULESH.cc succeeds. > > On Tue, Jan 9, 2018 at 2:05 AM, toddy wang <wenwangtoddy at gmail.com> wrote: > >> Quick results: >> >> [twang15 at c89 temp]$ clang -mllvm -help >> clang-5....

On Jan 5, 2018 11:30 PM, "toddy wang via llvm-dev" <llvm-dev at lists.llvm.org> wrote: What I am trying is to compile a program with different sets of optimization flags. If there is no fine-grained control over clang optimization flags, it would be impossible to achieve what I intend. LLD has -lto-newpm-passes (and...

...least requires an overall understanding of compiler internals, which can be gradually figured out. I believe 5 is interesting, but 2 may be good enough. More experiments are needed before decision is made. On Mon, Jan 8, 2018 at 12:56 AM, Mehdi AMINI <joker.eph at gmail.com> wrote: > Hi Toddy, > > You can achieve what you're looking for with a pipeline based on `clang > -Ox` + `opt -Ox` + `llc -Ox` (or lld instead of llc), but this won't be > guarantee'd to be well supported across releases of the compiler. > > Otherwise, if there are some performance-relea...

...clang++ b.o -o b.out; ./b.out 20 runtime: 9.096919e+00 Apparently, clang++ -O0 -Xclang -disable-O0-optnone does not work as expected. The conclusion seems to be -Xclang -disable-O0-optnone works when clang optimization level is O1/O2/O3, not O0. Any comments? On Sat, Jan 6, 2018 at 2:30 AM, toddy wang <wenwangtoddy at gmail.com> wrote: > What I am trying is to compile a program with different sets of > optimization flags. > If there is no fine-grained control over clang optimization flags, it > would be impossible to achieve what I intend. > > Although there is fine...

...Such a flag doesn't make much sense for 'llc' because llc mostly runs backend passes, which are much more difficult to construct custom pipelines for (backend passes are often required for correctness or have complex ordering requirements). -- Sean Silva On Jan 6, 2018 7:35 PM, "toddy wang" <wenwangtoddy at gmail.com> wrote: @Sean, do you mean llc ? For llc 4.0 and llc 5.0, I cannot find -lto-newpm-passes option, is it a hidden one? On Sat, Jan 6, 2018 at 7:37 PM, Sean Silva <chisophugis at gmail.com> wrote: > > > On Jan 5, 2018 11:30 PM, "toddy...

...lang also causes all functions to be marked noinline. I don't know if there is a command line option to turn that off. I recommend passing "-O1 -Xclang -disable-llvm-passes" to clang. Passing -O0 very specifically means disable optimizations. ~Craig On Sat, Jan 6, 2018 at 12:25 PM, toddy wang <wenwangtoddy at gmail.com> wrote: > @Craig and @Michael > > After installing clang-5.0 (download from http://releases.llvm.org, does > not have Flang build's slowdown mention above), > > 1. clang++ -O0 -Xclang -disable-O0-optnone -Xclang -disable-llvm-passes -c &g...