[v1] mostly i386 patches for 2024-06-04

[PULL 05/45] host/i386: assume presence of SSE2

Paolo Bonzini posted 45 patches 5 months, 3 weeks ago

Diff against v1
Download mbox

Maintainers: Paolo Bonzini <pbonzini@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Stefan Hajnoczi <stefanha@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Yanan Wang <wangyanan55@huawei.com>, Peter Xu <peterx@redhat.com>, David Hildenbrand <david@redhat.com>, Cornelia Huck <cohuck@redhat.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Thomas Huth <thuth@redhat.com>, Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>

There is a newer version of this series

Expand all Fold all

[PULL 05/45] host/i386: assume presence of SSE2

Posted by Paolo Bonzini 5 months, 3 weeks ago

QEMU now requires an x86-64-v2 host, which has SSE2.
Use it freely in buffer_is_zero.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 host/include/i386/host/cpuinfo.h | 1 -
 util/bufferiszero.c              | 4 ++--
 util/cpuinfo-i386.c              | 1 -
 3 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpuinfo.h
index 81771733eaa..72f6fad61e5 100644
--- a/host/include/i386/host/cpuinfo.h
+++ b/host/include/i386/host/cpuinfo.h
@@ -14,7 +14,6 @@
 #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 74864f7b782..11c080e02cf 100644
--- a/util/bufferiszero.c
+++ b/util/bufferiszero.c
@@ -188,14 +188,14 @@ static biz_accel_fn const accel_table[] = {
 
 static unsigned best_accel(void)
 {
+#ifdef CONFIG_AVX2_OPT
     unsigned info = cpuinfo_init();
 
-#ifdef CONFIG_AVX2_OPT
     if (info & CPUINFO_AVX2) {
         return 2;
     }
 #endif
-    return info & CPUINFO_SSE2 ? 1 : 0;
+    return 1;
 }
 
 #elif defined(__aarch64__) && defined(__ARM_NEON)
diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c
index 90f92a42dc8..ca74ef04f54 100644
--- a/util/cpuinfo-i386.c
+++ b/util/cpuinfo-i386.c
@@ -34,7 +34,6 @@ unsigned __attribute__((constructor)) cpuinfo_init(void)
     if (max >= 1) {
         __cpuid(1, a, b, c, d);
 
-        info |= (d & bit_SSE2 ? CPUINFO_SSE2 : 0);
         info |= (c & bit_MOVBE ? CPUINFO_MOVBE : 0);
         info |= (c & bit_POPCNT ? CPUINFO_POPCNT : 0);
         info |= (c & bit_PCLMUL ? CPUINFO_PCLMUL : 0);
-- 
2.45.1