Also, from what I understand, if noone imports my package, I can also remove the "module asm" lines at the start. Is that right?
Khanh On Monday, September 13, 2021 at 9:18:20 AM UTC+8 Khanh TN wrote: > Hi, > Thanks, Than, for the answer. > So, if the .go file I'm compiling is the one with "package main" "func > main()", I can remove the "module asm" lines without any consequences? > > Khanh > > On Friday, September 10, 2021 at 9:09:12 PM UTC+8 th...@google.com wrote: > >> 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 <tnkh...@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...@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/abf02438-5740-46e1-8577-2e001b3960f7n%40googlegroups.com.
