From: Jeff Law <jeffreyalaw@gmail.com>
To: Hans Boehm <hboehm@google.com>, Patrick O'Neill <patrick@rivosinc.com>
Cc: Palmer Dabbelt <palmer@rivosinc.com>,
gcc-patches@gcc.gnu.org, gnu-toolchain@rivosinc.com,
Vineet Gupta <vineetg@rivosinc.com>,
Andrew Waterman <andrew@sifive.com>,
kito.cheng@sifive.com, Daniel Lustig <dlustig@nvidia.com>,
cmuellner@gcc.gnu.org, Andrea Parri <andrea@rivosinc.com>
Subject: Re: [PATCH v5 00/11] RISC-V: Implement ISA Manual Table A.6 Mappings
Date: Sun, 30 Apr 2023 10:37:28 -0600 [thread overview]
Message-ID: <9eab1572-f1e5-c4a8-3460-259f71d77c96@gmail.com> (raw)
In-Reply-To: <CAMOCf+hK9nedV+UeENbTn=Uy3RpYLeMt04mLiLmDsZyNm83CCg@mail.gmail.com>
On 4/28/23 12:45, Hans Boehm wrote:
> We're certainly pushing for the same ABI (A.6 + trailing fence on store)
> in LLVM as well. I'm about to upload a pull request for the psABI
> document that describes this version of the ABI, and a bit of the
> rationale for it. I'll attach the current draft here.
>
> I agree that compatibility is critical here, not just across llvm and
> gcc, but also with other language implementations. That's part of the
> reason to get this correct asap.
>
> I believe that standardizing on A.6 + trailing fence on store, though
> initially suboptimal, is by far the best bet to get us to an efficient
> ABI in the long term. I expect the A.7 ABI to perform well. A.6, even
> without the trailing store fence, has annoyingly expensive seq_cst
> loads, which I would really like to get away from.
Thanks for the additional info. This stuff is well outside my area of
expertise, so having someone with your background to give key insights
is definitely appreciated.
jeff
next prev parent reply other threads:[~2023-04-30 16:37 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220407182918.294892-1-patrick@rivosinc.com>
2023-04-05 21:01 ` [PATCH v2 0/8] RISCV: " Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 1/8] RISCV: Eliminate SYNC memory models Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 2/8] RISCV: Enforce Libatomic LR/SC SEQ_CST Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 3/8] RISCV: Enforce atomic compare_exchange SEQ_CST Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 4/8] RISCV: Add AMO release bits Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 5/8] RISCV: Eliminate AMO op fences Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 6/8] RISCV: Weaken compare_exchange LR/SC pairs Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 7/8] RISCV: Weaken atomic stores Patrick O'Neill
2023-04-05 21:01 ` [PATCH v2 8/8] RISCV: Weaken mem_thread_fence Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 00/10] RISCV: Implement ISA Manual Table A.6 Mappings Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 01/10] RISCV: Eliminate SYNC memory models Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 02/10] RISCV: Enforce Libatomic LR/SC SEQ_CST Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 03/10] RISCV: Enforce atomic compare_exchange SEQ_CST Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 04/10] RISCV: Add AMO release bits Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 05/10] RISCV: Strengthen atomic stores Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 06/10] RISCV: Eliminate AMO op fences Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 07/10] RISCV: Weaken compare_exchange LR/SC pairs Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 08/10] RISCV: Weaken mem_thread_fence Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 09/10] RISCV: Weaken atomic loads Patrick O'Neill
2023-04-10 18:23 ` [PATCH v3 10/10] RISCV: Table A.6 conformance tests Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 00/10] RISCV: Implement ISA Manual Table A.6 Mappings Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 01/10] RISCV: Eliminate SYNC memory models Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 02/10] RISCV: Enforce Libatomic LR/SC SEQ_CST Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 03/10] RISCV: Enforce atomic compare_exchange SEQ_CST Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 04/10] RISCV: Add AMO release bits Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 05/10] RISCV: Strengthen atomic stores Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 06/10] RISCV: Eliminate AMO op fences Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 07/10] RISCV: Weaken compare_exchange LR/SC pairs Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 08/10] RISCV: Weaken mem_thread_fence Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 09/10] RISCV: Weaken atomic loads Patrick O'Neill
2023-04-14 17:09 ` [PATCH v4 10/10] RISCV: Table A.6 conformance tests Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 00/11] RISC-V: Implement ISA Manual Table A.6 Mappings Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 01/11] RISC-V: Eliminate SYNC memory models Patrick O'Neill
2023-04-28 16:23 ` Jeff Law
2023-05-02 20:12 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 02/11] RISC-V: Enforce Libatomic LR/SC SEQ_CST Patrick O'Neill
2023-04-28 16:50 ` Jeff Law
2023-05-02 20:12 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 03/11] RISC-V: Enforce subword atomic " Patrick O'Neill
2023-05-02 20:14 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 04/11] RISC-V: Enforce atomic compare_exchange SEQ_CST Patrick O'Neill
2023-04-28 17:23 ` Jeff Law
2023-05-02 20:15 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 05/11] RISC-V: Add AMO release bits Patrick O'Neill
2023-04-28 17:34 ` Jeff Law
2023-05-02 20:16 ` Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 06/11] RISC-V: Strengthen atomic stores Patrick O'Neill
2023-04-28 17:40 ` Jeff Law
2023-04-28 17:43 ` Palmer Dabbelt
2023-04-28 21:42 ` Hans Boehm
2023-04-28 22:21 ` Hans Boehm
2023-04-30 17:10 ` Jeff Law
2023-05-02 20:18 ` [Committed " Patrick O'Neill
2023-05-02 16:11 ` [PATCH v5 " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 07/11] RISC-V: Eliminate AMO op fences Patrick O'Neill
2023-04-28 17:43 ` Jeff Law
2023-05-02 20:19 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 08/11] RISC-V: Weaken LR/SC pairs Patrick O'Neill
2023-04-28 17:56 ` Jeff Law
2023-05-02 20:19 ` [Committed " Patrick O'Neill
2023-04-27 16:22 ` [PATCH v5 09/11] RISC-V: Weaken mem_thread_fence Patrick O'Neill
2023-04-28 18:00 ` Jeff Law
2023-05-02 20:20 ` [Committed " Patrick O'Neill
2023-05-03 12:18 ` [PATCH v5 " Andreas Schwab
2023-05-03 12:22 ` Martin Liška
2023-04-27 16:23 ` [PATCH v5 10/11] RISC-V: Weaken atomic loads Patrick O'Neill
2023-04-28 18:04 ` Jeff Law
2023-05-02 20:20 ` [Committed " Patrick O'Neill
2023-04-27 16:23 ` [PATCH v5 11/11] RISC-V: Table A.6 conformance tests Patrick O'Neill
2023-04-28 18:07 ` Jeff Law
2023-05-02 20:28 ` [Committed " Patrick O'Neill
2023-04-27 17:20 ` [PATCH v5 00/11] RISC-V: Implement ISA Manual Table A.6 Mappings Andrea Parri
2023-04-28 16:14 ` Jeff Law
2023-04-28 16:29 ` Palmer Dabbelt
2023-04-28 17:44 ` Patrick O'Neill
2023-04-28 18:18 ` Patrick O'Neill
[not found] ` <CAMOCf+hK9nedV+UeENbTn=Uy3RpYLeMt04mLiLmDsZyNm83CCg@mail.gmail.com>
2023-04-30 16:37 ` Jeff Law [this message]
2023-07-25 18:01 ` [gcc13 backport 00/12] " Patrick O'Neill
2023-07-25 18:01 ` [gcc13 backport 01/12] RISC-V: Eliminate SYNC memory models Patrick O'Neill
2023-07-25 18:01 ` [gcc13 backport 02/12] RISC-V: Enforce Libatomic LR/SC SEQ_CST Patrick O'Neill
2023-07-25 18:01 ` [gcc13 backport 03/12] RISC-V: Enforce subword atomic " Patrick O'Neill
2023-07-25 18:01 ` [gcc13 backport 04/12] RISC-V: Enforce atomic compare_exchange SEQ_CST Patrick O'Neill
2023-07-25 18:01 ` [gcc13 backport 05/12] RISC-V: Add AMO release bits Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 06/12] RISC-V: Strengthen atomic stores Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 07/12] RISC-V: Eliminate AMO op fences Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 08/12] RISC-V: Weaken LR/SC pairs Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 09/12] RISC-V: Weaken mem_thread_fence Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 10/12] RISC-V: Weaken atomic loads Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 11/12] RISC-V: Table A.6 conformance tests Patrick O'Neill
2023-07-25 18:02 ` [gcc13 backport 12/12] riscv: fix error: control reaches end of non-void function Patrick O'Neill
2023-07-26 1:22 ` Kito Cheng
2023-07-26 17:41 ` Patrick O'Neill
2023-07-25 19:50 ` [gcc13 backport 00/12] RISC-V: Implement ISA Manual Table A.6 Mappings Jakub Jelinek
2023-07-25 20:01 ` Palmer Dabbelt
2023-07-25 21:02 ` Jeff Law
2023-07-25 21:16 ` Palmer Dabbelt
2023-07-25 19:58 ` Palmer Dabbelt
2023-07-31 16:19 ` [Committed] " Patrick O'Neill
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