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[PULL,03/28] util: Add i386 CPUINFO_ATOMIC_VMOVDQU

Message ID 20230523235804.747803-4-richard.henderson@linaro.org
State Accepted
Commit a48b6afea4c6c7bbfa355eb732b9b97bf1d43d67
Headers show
Series [PULL,01/28] util: Introduce host-specific cpuinfo.h | expand

Commit Message

Richard Henderson May 23, 2023, 11:57 p.m. UTC 
Add a bit to indicate when VMOVDQU is also atomic if aligned.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 host/include/i386/host/cpuinfo.h | 1 +
 util/cpuinfo-i386.c              | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/host/include/i386/host/cpuinfo.h b/host/include/i386/host/cpuinfo.h
index e6f7461378..a6537123cf 100644
--- a/host/include/i386/host/cpuinfo.h
+++ b/host/include/i386/host/cpuinfo.h
@@ -25,6 +25,7 @@ 
 #define CPUINFO_AVX512DQ        (1u << 14)
 #define CPUINFO_AVX512VBMI2     (1u << 15)
 #define CPUINFO_ATOMIC_VMOVDQA  (1u << 16)
+#define CPUINFO_ATOMIC_VMOVDQU  (1u << 17)
 
 /* Initialized with a constructor. */
 extern unsigned cpuinfo;
diff --git a/util/cpuinfo-i386.c b/util/cpuinfo-i386.c
index 434319aa71..ab6143d9e7 100644
--- a/util/cpuinfo-i386.c
+++ b/util/cpuinfo-i386.c
@@ -77,8 +77,10 @@  unsigned __attribute__((constructor)) cpuinfo_init(void)
                  * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104688
                  */
                 __cpuid(0, a, b, c, d);
-                if (c == signature_INTEL_ecx || c == signature_AMD_ecx) {
+                if (c == signature_INTEL_ecx) {
                     info |= CPUINFO_ATOMIC_VMOVDQA;
+                } else if (c == signature_AMD_ecx) {
+                    info |= CPUINFO_ATOMIC_VMOVDQA | CPUINFO_ATOMIC_VMOVDQU;
                 }
             }
         }