wangpc-pp wrote: GCC gained its `__arm_rsr` and `__arm_wsr` support last year (October, 2023): https://gcc.gnu.org/pipermail/gcc-patches/2023-October/631855.html. So there is no stable released GCC version that supports these builtins. Clang supported these builtins about nine years ago: https://reviews.llvm.org/D9697. But as we know, clang is not the default compiler in most OS distributions. People may not even know these features. We can see some usages (ignore the gcc/llvm packages) via Debain Code Search: http://codesearch.debian.net/search?q=__arm_rsr&literal=1. So I think it's mainly a problem left over by history: ``` // Although the ARM ACLE does have a specification for __arm_rsr/__arm_wsr // for reading and writing to the status registers, they are not implemented // by GCC, so we need to resort to inline assembly. ``` As for RISCV, the software ecosystem is growing. So I just think we should do the right thing ASAP.
https://github.com/llvm/llvm-project/pull/85091 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
