From: Jeff Law <jeffreyalaw@gmail.com>
To: Christoph Muellner <christoph.muellner@vrull.eu>,
gcc-patches@gcc.gnu.org, Kito Cheng <kito.cheng@sifive.com>,
Jim Wilson <jim.wilson.gcc@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Andrew Waterman <andrew@sifive.com>,
Philipp Tomsich <philipp.tomsich@vrull.eu>,
Vineet Gupta <vineetg@rivosinc.com>
Subject: Re: [PATCH 1/7] riscv: bitmanip: add orc.b as an unspec
Date: Mon, 14 Nov 2022 10:53:21 -0700 [thread overview]
Message-ID: <fd820b4b-c8c4-f12b-b718-c9893c4cb289@gmail.com> (raw)
In-Reply-To: <15ccec02-5467-81aa-89b7-d75a7aa778c2@gmail.com>
On 11/14/22 09:51, Jeff Law wrote:
>
> On 11/13/22 16:05, Christoph Muellner wrote:
>> From: Philipp Tomsich <philipp.tomsich@vrull.eu>
>>
>> As a basis for optimized string functions (e.g., the by-pieces
>> implementations), we need orc.b available. This adds orc.b as an
>> unspec, so we can expand to it.
>>
>> gcc/ChangeLog:
>>
>> * config/riscv/bitmanip.md (orcb<mode>2): Add orc.b as an
>> unspec.
>> * config/riscv/riscv.md: Add UNSPEC_ORC_B.
> In general, we should prefer to express things as "real" RTL rather
> than UNSPECS. In this particular case expressing the orc could be
> done with a handful of IOR expressions, though they'd probably need to
> reference byte SUBREGs of the input and I dislike explicit SUBREGs in
> the md file even more than UNSPECs.
Mis-read the specs on orc. So ignore the comment about expressing this
as a handful of IORs and about it being reduc_ior_scal.
jeff
next prev parent reply other threads:[~2022-11-14 17:53 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-13 23:05 [PATCH 0/7] riscv: Improve builtins expansion Christoph Muellner
2022-11-13 23:05 ` [PATCH 1/7] riscv: bitmanip: add orc.b as an unspec Christoph Muellner
2022-11-14 16:51 ` Jeff Law
2022-11-14 17:53 ` Jeff Law [this message]
2022-11-14 19:05 ` Philipp Tomsich
2022-11-13 23:05 ` [PATCH 2/7] riscv: bitmanip/zbb: Add prefix/postfix and enable visiblity Christoph Muellner
2022-11-14 16:55 ` Jeff Law
2022-11-13 23:05 ` [PATCH 3/7] riscv: Enable overlap-by-pieces via tune param Christoph Muellner
2022-11-14 2:48 ` Vineet Gupta
2022-11-14 7:59 ` Philipp Tomsich
2022-11-14 8:29 ` Christoph Müllner
2022-11-14 19:04 ` Jeff Law
2022-11-14 19:07 ` Christoph Müllner
2022-11-13 23:05 ` [PATCH 4/7] riscv: Move riscv_block_move_loop to separate file Christoph Muellner
2022-11-14 16:56 ` Jeff Law
2022-11-13 23:05 ` [PATCH 5/7] riscv: Use by-pieces to do overlapping accesses in block_move_straight Christoph Muellner
2022-11-14 17:16 ` Jeff Law
2022-11-14 19:01 ` Christoph Müllner
2022-11-14 19:05 ` Jeff Law
2022-11-13 23:05 ` [PATCH 6/7] riscv: Add support for strlen inline expansion Christoph Muellner
2022-11-14 18:17 ` Jeff Law
2022-11-14 21:07 ` Christoph Müllner
2022-11-13 23:05 ` [PATCH 7/7] riscv: Add support for str(n)cmp " Christoph Muellner
2022-11-14 19:28 ` Jeff Law
2022-11-14 21:49 ` Christoph Müllner
2022-11-15 0:22 ` Jeff Law
2022-11-15 0:46 ` Kito Cheng
2022-11-15 0:53 ` Palmer Dabbelt
2022-11-15 1:55 ` Kito Cheng
2022-11-15 3:41 ` Jeff Law
2022-11-15 22:22 ` Christoph Müllner
2022-11-16 0:15 ` Philipp Tomsich
2022-11-21 3:24 ` Kito Cheng
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