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([2602:ae:1598:4c01:7ac5:31cc:3997:3a16]) by smtp.gmail.com with ESMTPSA id s188-20020a635ec5000000b0053491d92b65sm1675593pgb.84.2023.05.25.17.23.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 May 2023 17:23:46 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Subject: [PATCH v4 14/16] accel/tcg: Add x86_64 load_atom_extract_al16_or_al8 Date: Thu, 25 May 2023 17:23:32 -0700 Message-Id: <20230526002334.1760495-15-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230526002334.1760495-1-richard.henderson@linaro.org> References: <20230526002334.1760495-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1031; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1031.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Signed-off-by: Richard Henderson --- .../x86_64/host/load-extract-al16-al8.h | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 host/include/x86_64/host/load-extract-al16-al8.h diff --git a/host/include/x86_64/host/load-extract-al16-al8.h b/host/include/x86_64/host/load-extract-al16-al8.h new file mode 100644 index 0000000000..31b6fe8c45 --- /dev/null +++ b/host/include/x86_64/host/load-extract-al16-al8.h @@ -0,0 +1,50 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * Atomic extract 64 from 128-bit, x86_64 version. + * + * Copyright (C) 2023 Linaro, Ltd. + */ + +#ifndef X86_64_LOAD_EXTRACT_AL16_AL8_H +#define X86_64_LOAD_EXTRACT_AL16_AL8_H + +#ifdef CONFIG_INT128_TYPE +#include "host/cpuinfo.h" + +/** + * load_atom_extract_al16_or_al8: + * @pv: host address + * @s: object size in bytes, @s <= 8. + * + * Load @s bytes from @pv, when pv % s != 0. If [p, p+s-1] does not + * cross an 16-byte boundary then the access must be 16-byte atomic, + * otherwise the access must be 8-byte atomic. + */ +static inline uint64_t ATTRIBUTE_ATOMIC128_OPT +load_atom_extract_al16_or_al8(void *pv, int s) +{ + uintptr_t pi = (uintptr_t)pv; + __int128_t *ptr_align = (__int128_t *)(pi & ~7); + int shr = (pi & 7) * 8; + Int128Alias r; + + /* + * ptr_align % 16 is now only 0 or 8. + * If the host supports atomic loads with VMOVDQU, then always use that, + * making the branch highly predictable. Otherwise we must use VMOVDQA + * when ptr_align % 16 == 0 for 16-byte atomicity. + */ + if ((cpuinfo & CPUINFO_ATOMIC_VMOVDQU) || (pi & 8)) { + asm("vmovdqu %1, %0" : "=x" (r.i) : "m" (*ptr_align)); + } else { + asm("vmovdqa %1, %0" : "=x" (r.i) : "m" (*ptr_align)); + } + return int128_getlo(int128_urshift(r.s, shr)); +} +#else +/* Fallback definition that must be optimized away, or error. */ +uint64_t QEMU_ERROR("unsupported atomic") + load_atom_extract_al16_or_al8(void *pv, int s); +#endif + +#endif /* X86_64_LOAD_EXTRACT_AL16_AL8_H */ -- 2.34.1