I feel as though we're getting into the realm of "what is the sound of one hand clapping"... ?
Than On Mon, Sep 13, 2021 at 1:51 PM Ian Lance Taylor <i...@golang.org> wrote: > 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 > . > -- 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%2BUr55EwO3HOPK7bw819ic_xDBFJhPCgPDmVkb%2BO%3Dgfu8%2B85Eg%40mail.gmail.com.
