On Wed, Apr 19, 2023 at 3:15 PM Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> wrote: > > On Wed, Apr 19, 2023 at 02:35:02PM -0700, Nick Desaulniers wrote: > > On Wed, Apr 19, 2023 at 9:50 AM Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: > > > > > > > > > > > > > 2023年4月18日 21:07，Nick Desaulniers <ndesaulniers@xxxxxxxxxx> 写道： > > > > > > > > On Fri, Apr 14, 2023 at 1:07 AM Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> wrote: > > > >> > > > >> LLVM does not implement some of -march options. However those options > > > >> are not mandatory for kernel to build for those CPUs. > > > >> > > > >> Fallback -march CFLAG to ISA level if unsupported by toolchain so > > > >> we can get those kernel to build with LLVM. > > > >> > > > >> Link: https://github.com/ClangBuiltLinux/linux/issues/1544 > > > >> Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx> > > > >> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> > > > > > > > > Thanks for the patch! Maybe it's more obvious to folks who work on > > > > mips, but how did you determine that say `p5600` is `mips32r5` or > > > > `r10000` is `mips4`? > > > > > > Wikipedia [1] should fit the purpose. > > > > > > [1]: https://en.wikipedia.org/wiki/List_of_MIPS_architecture_processors > > > > Mostly! Though I was not able to verify: > > - p5600 > > mips32r5 > > > - r5500 > > mips4 > > > - rm5200 > > mips4 > > > - sb1 > > mips64r1 Thomas, thanks for reviewing datasheets to verify this. Jiaxun, for SB1, you have cc-option fall back to -march=mips4, does that need to be -march=mips64r1? (With that last question resolved, I'm happy to sign off on this patch) > > all information taken from datasheets. > > > - loongson* > > probably depends on the exact type, but as I don't have datasheets > I can't say what it is exactly, probaly mips32r2/mips64r2. Oh look Jiaxun, you are the maintainer for "MIPS/LOONGSON64 ARCHITECTURE" ok then I will trust your knowledge of this architecture! --- Separate question to Huacai, Wang, and the loongarch list; I know LLVM landed the Loongarch backend recently; any idea what's the status of building arch=loongarch with LLVM=1 (linux kernel)? -- Thanks, ~Nick Desaulniers
