Hi, The "module asm" at the start of your bitcode dump is actually the export data for the package, so it plays a pretty crucial role.
Deleting the export data from the "main" package may work in some cases (since nobody imports main), but it will certainly cause problems if you delete the export data from some other non-main package. Export data tends to be substantial because it is based on the transitive closure of the imported packages (e.g. "fmt" imports "io", then "io" imports "sync", then "sync" imports "runtime", and so on). On the other hand, Go export data is *way* smaller than the volume of header information that would have to be consumed by a C++ compiler when building your average C++ source file. Than On Thu, Sep 9, 2021 at 6:31 AM Khanh TN <tnkha...@gmail.com> wrote: > A Helloworld written in C++ is around 75 lines in LLVM IR. > However, a Helloworld written in Golang compiled with gollvm is around > 900/1000 lines of .ll file. I produced the LLVM IR with instructions from > https://go.googlesource.com/gollvm/ > I'm using LLVM11, so, older compatible commit of gollvm, not sure newer > versions are different. > > How can I produce shorter/simplified LLVM IR? > Thanks! > > Cheers, > Khanh > > > P/S: > An LLVM IR file has a lot of module asm at the start, like: > module asm "\09.section \22.go_export\22,\22e\22,@progbits" > module asm "\09.ascii \22v3;\\n\22" > module asm "\09.ascii \22package \22" > module asm "\09.ascii \22main\22" > module asm "\09.ascii \22\\n\22" > module asm "\09.ascii \22pkgpath \22" > module asm "\09.ascii \22main\22" > > I figure I can delete all the module asm line and my program still runs > correctly (I only tested 2 times on simple programs). Is this a legit > optimization? > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/8ee91024-b270-4d1e-99b9-dbcd3e25d4c4n%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/8ee91024-b270-4d1e-99b9-dbcd3e25d4c4n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CA%2BUr55FiSx-NmjuM1ub6czS68Dr30ybJFbYt3QSC_4%2BOt3Jp0w%40mail.gmail.com.
