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c329530e6b
We need to select which SIMD variable to check based on the compilation target: HAVE_KERNEL_xxx for the Linux kernel, HAVE_TOOLCHAIN_xxx for other platforms. This adds a HAVE_SIMD() macro returns the right result depending on the definedness or value of the variable for this target. The macro is in simd_config.h, which is forcibly included in every compiler call (like zfs_config.h), to ensure that it can be used directly without further includes. Sponsored-by: TrueNAS Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@truenas.com> Closes #18285
103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2026, TrueNAS.
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*/
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#ifndef _SYS_SIMD_CONFIG_H
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#define _SYS_SIMD_CONFIG_H
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/*
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* Goal: a HAVE_SIMD(x) macro that expands to either 1 or 0 depending on
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* the availabilty of that extension on the wanted toolchain.
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*
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* We need to allow the following:
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* - #define HAVE_TOOLCHAIN_AVX 1 (zfs_config.h, detected by configure)
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* - #undef HAVE_TOOLCHAIN_AVX (zfs_config.h, probed but not detected)
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* - -DHAVE_TOOLCHAIN_AVX (Makefile.bsd)
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*
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* For completeness, we also allow disabling by defined HAVE_TOOLCHAIN_AVX=0.
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*
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* The "obvious" implementation of this would be a macro that includes
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* defined(...) in its expansion, but unfortunately that is not portable, and
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* can produce compiler warnings (see -Wexpansion-to-defined). So we need to
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* build our own version.
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*/
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/*
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* 1. Expand incoming token to its defined value, if anything:
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* eg HAVE_SIMD(AVX)
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* -> _zfs_deftrue(HAVE_TOOLCHAIN_AVX)
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* or -> __zfs_deftrue() (HAVE_TOOLCHAIN_AVX defined)
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* or -> __zfs_deftrue(1) (HAVE_TOOLCHAIN_AVX = 1)
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* -> __zfs_deftrue(0) (HAVE_TOOLCHAIN_AVX = 0)
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* or -> __zfs_deftrue(HAVE_TOOLCHAIN_AVX) (HAVE_TOOLCHAIN_AVX undef)
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*/
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#define _zfs_deftrue(x) __zfs_deftrue(x)
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/*
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* 2. Replace know values with a token that we control:
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* __zfs_deftrue()
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* -> ___zfs_deftrue(___zfs_deftrue_arg_)
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* __zfs_deftrue(1)
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* -> ___zfs_deftrue(___zfs_deftrue_arg_1)
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* __zfs_deftrue(0)
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* -> ___zfs_deftrue(___zfs_deftrue_arg_0)
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* __zfs_deftrue(HAVE_TOOLCHAIN_AVX)
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* -> ___zfs_deftrue(___zfs_deftrue_arg_HAVE_TOOLCHAIN_AVX)
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*/
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#define __zfs_deftrue(v) ___zfs_deftrue(___zfs_deftrue_arg_##v)
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/*
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* 3. Expand the incoming token into positional parameters for the next call:
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* ___zfs_deftrue(___zfs_deftrue_arg_0)
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* -> ____zfs_deftrue(0, 0, 0)
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* ___zfs_deftrue(___zfs_deftrue_arg_1)
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* -> ____zfs_deftrue(0, 1, 0)
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* ___zfs_deftrue(___zfs_deftrue_arg_HAVE_TOOLCHAIN_AVX)
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* -> ____zfs_deftrue(___zfs_deftrue_arg_HAVE_TOOLCHAIN_AVX, 0)
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*/
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#define ___zfs_deftrue_arg_ 0, 1
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#define ___zfs_deftrue_arg_1 0, 1
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#define ___zfs_deftrue_arg_0 0, 0
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#define ___zfs_deftrue(t, ...) ____zfs_deftrue(t, 0)
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/*
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* 4. Emit the second argument, either the original value or the default 0.
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* ____zfs_deftrue(0, 0, 0) -> 0
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* ____zfs_deftrue(0, 1, 0) -> 1
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* ____zfs_deftrue(___zfs_deftrue_arg_HAVE_TOOLCHAIN_AVX, 0) -> 0
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*/
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#define ____zfs_deftrue(_n, v, ...) v
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/*
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* The Linux kernel requires a specific toolchain. Everything else uses the
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* regular compiler toolchain.
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*/
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#if defined(_KERNEL) && defined(__linux__)
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#define HAVE_SIMD(ext) _zfs_deftrue(HAVE_KERNEL_##ext)
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#else
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#define HAVE_SIMD(ext) _zfs_deftrue(HAVE_TOOLCHAIN_##ext)
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#endif
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#endif
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