On Mon, Sep 13, 2021 at 6:03 AM Khanh TN <tnkha...@gmail.com> wrote: > > Also, from what I understand, if noone imports my package, I can also remove > the "module asm" lines at the start. Is that right?
What is the use of a package that nobody imports? Ian > 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. > > -- > 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. -- 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/CAOyqgcV%2BMR2FBArbR6ZNgCgs1DbO_Hwccu%2BOD3SuvLLRm6%2Bqcg%40mail.gmail.com.
