kito-cheng added a comment. Provide more implementation detail on GCC,
- if a letter are used as a prefix of multi-char constraint, then it can't be used as a single letter constraint - e.g. If we defined `vr` and `vm` then we can't define `v` as constraint - constraint with same prefix should have same length - e.g. If we defined `vr` and `vm` then we can't define `vrr` since has different length. And in fact we have defined bunch of predicate prefixed with `v`[1], but I am open mind to change if needed that since GCC didn't upstream that yet. [1] https://github.com/riscv/riscv-gcc/blob/riscv-gcc-10.1-rvv-dev/gcc/config/riscv/constraints.md#L117 Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D98616/new/ https://reviews.llvm.org/D98616 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
