在 2024/12/15 23:50, Jeff Law 写道:
On 12/3/24 4:02 AM, Jiawei wrote:
This patch introduces support for RISC-V Profiles RV20 and RV22 [1],
enabling developers to utilize these profiles through the -march option.
[1] https://github.com/riscv/riscv-profiles/releases/tag/v1.0
gcc/ChangeLog:
* common/config/riscv/riscv-common.cc (struct riscv_profiles):
New struct.
(riscv_subset_list::parse_profiles): New parser.
(riscv_subset_list::parse_base_ext): Ditto.
* config/riscv/riscv-subset.h: New def.
[ ... ]
+const char *
+riscv_subset_list::parse_profiles (const char *p)
+{
+ /* Checking if input string contains a Profiles.
+ There are two cases use Profiles in -march option:
+
+ 1. Only use Profiles as -march input
+ 2. Mixed Profiles with other extensions
+
+ Use '+' to split Profiles and other extension. */
Does LLVM use this same convention (using '+' to split profiles from
additional extensions)? I don't see it in the spec so I think we
really need to make sure LLVM and GCC are in sync on this.
I think we need some kind of documentation around the new option in
invoke.texi.
I didn't check the precise set of options in the spec. That should be
double-checked in the expected update of this patchkit.
jeff
In fact, we do have a PR in
https://github.com/riscv-non-isa/riscv-toolchain-conventions/pull/36 to
discuss the format, but it was out of date, I will pick up it, and
update the format doc first in
recent days.
BR,
Jiawei
