efriedma added a comment. As far as I can see, there are three significant issues with the current -mgeneral-regs-only:
1. We don't correctly ignore inline asm clobbers for registers which aren't allocatable (https://bugs.llvm.org/show_bug.cgi?id=30792) 2. We don't diagnose calls which need vector registers according to the C calling convention. 3. We don't diagnose operations which have to be lowered to libcalls which need vector registers according to the C calling convention (fptosi, @llvm.sin.*, etc.). All three of these could be addressesed in the AArch64 backend in a straightforward manner. Diagnosing floating-point operations in Sema in addition to whatever backend fixes we might want is fine, I guess, but I don't really like making "-mgeneral-regs-only" into "-mno-implicit-float" plus some diagnostics; other frontends don't benefit from this checking, and using no-implicit-float is asking for an obscure miscompile if IR generation or an optimization accidentally produces a floating-point value. https://reviews.llvm.org/D38479 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
