[llvm-dev] Clang for the PlayStation 2 (original) (raw)

Alexander Richardson via llvm-dev llvm-dev at lists.llvm.org
Sat Sep 8 15:32:20 PDT 2018

On Fri, 7 Sep 2018 at 18:53, Dan Ravensloft via llvm-dev <llvm-dev at lists.llvm.org> wrote:

On Fri, 7 Sep 2018 at 17:48, Tim Northover <t.p.northover at gmail.com> wrote:

I looked at your diffs and you've only changed one of the functions to return SDValue(), you need to change lowerFPTOSINT itself too. The one with the store is just there as an optimization; if it doesn't trigger (because of your diff) then lowerFPTOSINT will still create a bad node afterwards. Thank you! With that, the four bugs I found in newlib's C code are dead. I think the lrint fix should be upstreamed right away; would you mind if I credited you in the patch? Unfortunately, we are not out of the woods yet. If memory serves me correctly, newlib has some assembly code in used for things like start to bring up the C runtime, which GNU binutils accepts and Clang's assembler currently does not. I'll go build that so I'm not talking out of my ass.

Hi Dan,

In case you are interested in the baremetal libgloss bits, I made some changes to get that to compile with clang in <https://github.com/CTSRD-CHERI/newlib>. This also contains some unrelated changes to make it easier to use on QEMU MALTA and to build in CHERI pure-capability mode but the changes to the MIPS crt0 bits might be useful. I believe <https://github.com/CTSRD-CHERI/newlib/commit/2e686345f77a1b745e504ffdbdf012ec78fbfc74> and possibly some follow-up commits should be sufficient to compile libgloss with clang (at least for MIPS64).

Alex

Cheers, Tim!

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