From: Paolo Bonzini <pbonzini@redhat.com>
To: Robert Hoo <robert.hu@linux.intel.com>,
qemu-devel@nongnu.org, laurent@vivier.eu, philmd@redhat.com,
berrange@redhat.com
Cc: robert.hu@intel.com
Subject: Re: [PATCH 2/2] util: add util function buffer_zero_avx512()
Date: Thu, 13 Feb 2020 11:30:08 +0100 [thread overview]
Message-ID: <dfc22e0f-79db-25d7-ccd8-26db1353c3b6@redhat.com> (raw)
In-Reply-To: <1581580379-54109-3-git-send-email-robert.hu@linux.intel.com>
On 13/02/20 08:52, Robert Hoo wrote:
> +
> +}
> +#pragma GCC pop_options
> +#endif
> +
> +
> /* Note that for test_buffer_is_zero_next_accel, the most preferred
> * ISA must have the least significant bit.
> */
> -#define CACHE_AVX2 1
> -#define CACHE_SSE4 2
> -#define CACHE_SSE2 4
> +#define CACHE_AVX512F 1
> +#define CACHE_AVX2 2
> +#define CACHE_SSE4 4
> +#define CACHE_SSE2 6
This should be 8, not 6.
Paolo
>
> /* Make sure that these variables are appropriately initialized when
> * SSE2 is enabled on the compiler command-line, but the compiler is
> @@ -226,6 +268,11 @@ static void init_accel(unsigned cache)
> fn = buffer_zero_avx2;
> }
> #endif
> +#ifdef CONFIG_AVX512F_OPT
> + if (cache & CACHE_AVX512F) {
> + fn = buffer_zero_avx512;
> + }
> +#endif
> buffer_accel = fn;
> }
>
> @@ -255,6 +302,9 @@ static void __attribute__((constructor)) init_cpuid_cache(void)
> if ((bv & 6) == 6 && (b & bit_AVX2)) {
> cache |= CACHE_AVX2;
> }
> + if ((bv & 6) == 6 && (b & bit_AVX512F)) {
> + cache |= CACHE_AVX512F;
> + }
> }
next prev parent reply other threads:[~2020-02-13 10:31 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-13 7:52 [PATCH 0/2] Add AVX512F optimization option and buffer_zero_avx512() Robert Hoo
2020-02-13 7:52 ` [PATCH 1/2] configure: add configure option avx512f_opt Robert Hoo
2020-02-13 7:52 ` [PATCH 2/2] util: add util function buffer_zero_avx512() Robert Hoo
2020-02-13 10:30 ` Paolo Bonzini [this message]
2020-02-13 11:58 ` Robert Hoo
2020-02-13 18:20 ` Richard Henderson
2020-02-24 7:07 ` Robert Hoo
2020-02-24 16:13 ` Richard Henderson
2020-02-25 7:34 ` Robert Hoo
2020-02-25 15:29 ` Richard Henderson
2020-02-13 8:40 ` [PATCH 0/2] Add AVX512F optimization option and buffer_zero_avx512() no-reply
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