From: Richard Henderson <richard.henderson@linaro.org>
To: "Nicholas Piggin" <npiggin@gmail.com>,
"Philippe Mathieu-Daudé" <philmd@linaro.org>,
qemu-devel@nongnu.org
Cc: qemu-ppc@nongnu.org,
"Daniel Henrique Barboza" <danielhb413@gmail.com>,
"Cédric Le Goater" <clg@kaod.org>
Subject: Re: [RFC PATCH 9/9] target/ppc: Use tcg_gen_sextract_tl
Date: Wed, 25 Oct 2023 00:38:27 -0700 [thread overview]
Message-ID: <e6e8c3f4-809c-47e0-96eb-1ec5a59170f7@linaro.org> (raw)
In-Reply-To: <CWHBYSZE3X91.1YCI4JXJ3H2SE@wheely>
On 10/25/23 00:09, Nicholas Piggin wrote:
>> I'd be tempted to use and+movcond instead of sext+andc.
>
> That would be simpler / more mechnical following of specification
> in the ISA. Might be better to save that for a later patch though.
> Any downsides for backend generation? On host without cmov?
Probably not enough to worry about.
Virtually all extant hosts do have cmov. Those that don't have it as part of the ISA *do*
have it in the TCG backend, implemented as branch over next, for minimal code size.
r~
prev parent reply other threads:[~2023-10-25 7:39 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-23 16:09 [PATCH 0/9] tcg: Use tcg_gen_[s]extract_{i32,i64,tl} Philippe Mathieu-Daudé
2023-10-23 16:09 ` [PATCH 1/9] target/avr: Use tcg_gen_extract_tl Philippe Mathieu-Daudé
2023-10-23 23:32 ` Richard Henderson
2023-10-24 7:21 ` Michael Rolnik
2023-10-23 16:09 ` [PATCH 2/9] target/cris: " Philippe Mathieu-Daudé
2023-10-23 23:36 ` Richard Henderson
2023-10-24 8:44 ` Edgar E. Iglesias
2023-10-23 16:09 ` [PATCH 3/9] target/mips: Use tcg_gen_extract_i32 Philippe Mathieu-Daudé
2023-10-23 23:39 ` Richard Henderson
2023-10-23 16:09 ` [PATCH 4/9] target/ppc: " Philippe Mathieu-Daudé
2023-10-23 23:40 ` Richard Henderson
2023-10-23 16:09 ` [PATCH 5/9] target/sparc: Use tcg_gen_extract_tl Philippe Mathieu-Daudé
2023-10-23 23:41 ` Richard Henderson
2023-10-23 16:09 ` [PATCH 6/9] target/xtensa: Use tcg_gen_extract_i32 Philippe Mathieu-Daudé
2023-10-23 17:56 ` Max Filippov
2023-10-23 16:09 ` [PATCH 7/9] target/mips: Use tcg_gen_sextract_tl Philippe Mathieu-Daudé
2023-10-24 0:14 ` Richard Henderson
2023-10-24 8:57 ` Philippe Mathieu-Daudé
2023-10-24 16:55 ` Philippe Mathieu-Daudé
2023-10-23 16:09 ` [RFC PATCH 8/9] target/cris: " Philippe Mathieu-Daudé
2023-10-24 0:26 ` Richard Henderson
2023-10-24 8:42 ` Edgar E. Iglesias
2023-10-24 8:53 ` Philippe Mathieu-Daudé
2023-10-24 8:58 ` Philippe Mathieu-Daudé
2023-10-23 16:09 ` [RFC PATCH 9/9] target/ppc: " Philippe Mathieu-Daudé
2023-10-24 1:04 ` Richard Henderson
2023-10-25 7:09 ` Nicholas Piggin
2023-10-25 7:33 ` Philippe Mathieu-Daudé
2023-10-25 20:26 ` Richard Henderson
2023-10-25 7:38 ` Richard Henderson [this message]
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