2 Commits

Author	SHA1	Message	Date
Weining Lu	cd0174aacb	[Clang][LoongArch] Support inline asm constraint 'J' ... 'J' is defined in GCC [1] but not documented [2] while Linux [3] has already used it in LoongArch port. [1]: https://github.com/gcc-mirror/gcc/blob/master/gcc/config/loongarch/constraints.md#L61 [2]: https://gcc.gnu.org/onlinedocs/gccint/Machine-Constraints.html [3]: https://github.com/torvalds/linux/blob/master/arch/loongarch/include/asm/cmpxchg.h#L19 Differential Revision: https://reviews.llvm.org/D136835	2022-10-31 09:13:52 +08:00
Weining Lu	394f30919a	[Clang][LoongArch] Add inline asm support for constraints f/l/I/K ... This patch adds support for constraints `f`, `l`, `I`, `K` according to [1]. The remain constraints (`k`, `m`, `ZB`, `ZC`) will be added later as they are a little more complex than the others. f: A floating-point register (if available). l: A signed 16-bit constant. I: A signed 12-bit constant (for arithmetic instructions). K: An unsigned 12-bit constant (for logic instructions). For now, no need to support register alias (e.g. `$a0`) in llvm as clang will correctly decode the usage of register name aliases into their official names. And AFAIK, the not yet upstreamed `rustc` for LoongArch will always use official register names (e.g. `$r4`). [1] https://gcc.gnu.org/onlinedocs/gccint/Machine-Constraints.html Differential Revision: https://reviews.llvm.org/D134157	2022-09-26 08:49:58 +08:00