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Thu, 20 Jun 2024 06:03:07 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFR4aHAZ6xt/O21ytBNlhtOAmUXMvL4bQH78obqORQ5BeT0L4sxIm03+Svx1Ww1wtCwUHFd3w== X-Received: by 2002:a50:d504:0:b0:57c:6861:d72b with SMTP id 4fb4d7f45d1cf-57d272db7a2mr437956a12.9.1718888586636; Thu, 20 Jun 2024 06:03:06 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , amonakov@ispras.ru Subject: [PATCH 3/6] Revert "host/i386: assume presence of SSE2" Date: Thu, 20 Jun 2024 15:02:51 +0200 Message-ID: <20240620130254.415699-4-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240620130254.415699-1-pbonzini@redhat.com> References: <20240620130254.415699-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.152, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, 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+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1718888680424100007 Content-Type: text/plain; charset="utf-8" This reverts commit b18236897ca15c3db1506d8edb9a191dfe51429c. The x86-64 instruction set can now be tuned down to x86-64 v1 or i386 Pentium Pro. Signed-off-by: Paolo Bonzini --- host/include/i386/host/cpuinfo.h | 1 + util/bufferiszero.c | 4 ++-- util/cpuinfo-i386.c | 1 + 3 files changed, 4 insertions(+), 2 deletions(-) diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpui= nfo.h index 72f6fad61e5..81771733eaa 100644 --- a/host/include/i386/host/cpuinfo.h +++ b/host/include/i386/host/cpuinfo.h @@ -14,6 +14,7 @@ #define CPUINFO_POPCNT (1u << 4) #define CPUINFO_BMI1 (1u << 5) #define CPUINFO_BMI2 (1u << 6) +#define CPUINFO_SSE2 (1u << 7) #define CPUINFO_AVX1 (1u << 9) #define CPUINFO_AVX2 (1u << 10) #define CPUINFO_AVX512F (1u << 11) diff --git a/util/bufferiszero.c b/util/bufferiszero.c index 11c080e02cf..74864f7b782 100644 --- a/util/bufferiszero.c +++ b/util/bufferiszero.c @@ -188,14 +188,14 @@ static biz_accel_fn const accel_table[] =3D { =20 static unsigned best_accel(void) { -#ifdef CONFIG_AVX2_OPT unsigned info =3D cpuinfo_init(); =20 +#ifdef CONFIG_AVX2_OPT if (info & CPUINFO_AVX2) { return 2; } #endif - return 1; + return info & CPUINFO_SSE2 ? 1 : 0; } =20 #elif defined(__aarch64__) && defined(__ARM_NEON) diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c index ca74ef04f54..90f92a42dc8 100644 --- a/util/cpuinfo-i386.c +++ b/util/cpuinfo-i386.c @@ -34,6 +34,7 @@ unsigned __attribute__((constructor)) cpuinfo_init(void) if (max >=3D 1) { __cpuid(1, a, b, c, d); =20 + info |=3D (d & bit_SSE2 ? CPUINFO_SSE2 : 0); info |=3D (c & bit_MOVBE ? CPUINFO_MOVBE : 0); info |=3D (c & bit_POPCNT ? CPUINFO_POPCNT : 0); info |=3D (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0); --=20 2.45.2