My language is producing a lot of very short functions, typically two or
three instructions long. These should be ideal candidates for inlining,
but it isn't happening.
My compiler is producing one big bitcode file, and all the functions are
marked as 'internal'. I'm then doing the optimisation and
translation
manually using llc -O3 into a .s file, and then linking this against the
runtime using gcc.
I see that llvm-ld supports an inlining pass; is this the *only* place
it happens? i.e. do I need to run llvm-ld on my bitcode file before
translation? If not, is there anything specifically I need to do in the
compiler to make inlining happen?
--
┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ───── http://www.cowlark.com ─────
│
│ life←{ ↑1 ⍵∨.^3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵ }
│ --- Conway's Game Of Life, in one line of APL
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20100922/a0a95be8/attachment.sig>
On Sep 22, 2010, at 9:54 AM, David Given wrote:> My language is producing a lot of very short functions, typically two or > three instructions long. These should be ideal candidates for inlining, > but it isn't happening. > > My compiler is producing one big bitcode file, and all the functions are > marked as 'internal'. I'm then doing the optimisation and translation > manually using llc -O3 into a .s file, and then linking this against the > runtime using gcc. >Are you running 'opt' on your bitcode or otherwise manually running those passes?> I see that llvm-ld supports an inlining pass; is this the *only* place > it happens? i.e. do I need to run llvm-ld on my bitcode file before > translation? If not, is there anything specifically I need to do in the > compiler to make inlining happen? > > -- > ┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ───── http://www.cowlark.com ───── > │ > │ life←{ ↑1 ⍵∨.^3 4=+/,¯1 0 1∘.⊖¯1 0 1∘.⌽⊂⍵ } > │ --- Conway's Game Of Life, in one line of APL > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
On 22/09/10 18:07, Jim Grosbach wrote: [...]> Are you running 'opt' on your bitcode or otherwise manually running those passes?Aha. After running opt I now have inlined (and much better) code. Previously I'd been using llc -O3 to do the optimisation. What's the different between opt -O3 and llc -O3, then? -- ┌─── ｄｇ＠ｃｏｗｌａｒｋ．ｃｏｍ ───── http://www.cowlark.com ───── │ "To be is to do" -- Nietzche │ "To do is to be" -- Sartre │ "Do be do be do" -- Sinatra -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 254 bytes Desc: OpenPGP digital signature URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100922/edc0df2c/attachment.sig>