From: Richard Henderson <richard.henderson@linaro.org>
To: "Philippe Mathieu-Daudé" <philmd@linaro.org>, qemu-devel@nongnu.org
Subject: Re: [PATCH v6 06/10] util/bufferiszero: Improve scalar variant
Date: Mon, 29 Apr 2024 05:31:22 -0700 [thread overview]
Message-ID: <80f07930-e5e5-496b-ba08-6091ebe55c1e@linaro.org> (raw)
In-Reply-To: <400f20e7-3c33-4916-897a-0d6b21d572c4@linaro.org>
On 4/29/24 05:18, Philippe Mathieu-Daudé wrote:
>> +
>> + t = ldq_he_p(buf) | ldq_he_p(buf + len - 8);
>
> Here we read #0 and #31, ...
>
>> + p = QEMU_ALIGN_PTR_DOWN(buf + 8, 8);
>> + e = QEMU_ALIGN_PTR_DOWN(buf + len - 1, 8);
>> +
>> + /* Read 0 to 31 aligned words from the middle. */
>
> ... so here is #1 to #30?
Not indexes, but count. There may be zero words remaining in the middle, etc.
r~
next prev parent reply other threads:[~2024-04-29 12:32 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-24 22:56 [PATCH v6 00/10] Optimize buffer_is_zero Richard Henderson
2024-04-24 22:56 ` [PATCH v6 01/10] util/bufferiszero: Remove SSE4.1 variant Richard Henderson
2024-04-24 22:56 ` [PATCH v6 02/10] util/bufferiszero: Remove AVX512 variant Richard Henderson
2024-04-29 11:16 ` Daniel P. Berrangé
2024-04-29 11:29 ` Alexander Monakov
2024-04-24 22:56 ` [PATCH v6 03/10] util/bufferiszero: Reorganize for early test for acceleration Richard Henderson
2024-04-24 22:56 ` [PATCH v6 04/10] util/bufferiszero: Remove useless prefetches Richard Henderson
2024-04-24 22:57 ` [PATCH v6 05/10] util/bufferiszero: Optimize SSE2 and AVX2 variants Richard Henderson
2024-04-24 22:57 ` [PATCH v6 06/10] util/bufferiszero: Improve scalar variant Richard Henderson
2024-04-29 12:18 ` Philippe Mathieu-Daudé
2024-04-29 12:31 ` Richard Henderson [this message]
2024-04-29 13:21 ` Philippe Mathieu-Daudé
2024-04-24 22:57 ` [PATCH v6 07/10] util/bufferiszero: Introduce biz_accel_fn typedef Richard Henderson
2024-04-29 11:14 ` Philippe Mathieu-Daudé
2024-04-24 22:57 ` [PATCH v6 08/10] util/bufferiszero: Simplify test_buffer_is_zero_next_accel Richard Henderson
2024-04-29 11:05 ` Philippe Mathieu-Daudé
2024-04-24 22:57 ` [PATCH v6 09/10] util/bufferiszero: Add simd acceleration for aarch64 Richard Henderson
2024-04-29 11:06 ` Philippe Mathieu-Daudé
2024-04-29 12:45 ` Philippe Mathieu-Daudé
2024-04-24 22:57 ` [PATCH v6 10/10] tests/bench: Add bufferiszero-bench Richard Henderson
2024-04-29 11:12 ` Philippe Mathieu-Daudé
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