From: Fiona Glaser <[email protected]>
---
libavutil/x86/cpu.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c
index e7647dc..7cc9896 100644
--- a/libavutil/x86/cpu.c
+++ b/libavutil/x86/cpu.c
@@ -221,6 +221,12 @@ int ff_get_cpu_flags_x86(void)
* functions on the Atom. */
if (model == 28)
rval |= AV_CPU_FLAG_ATOM;
+
+ /* Conroe has a slow shuffle unit. Check the model number to ensure not
+ * to include crippled low-end Penryns and Nehalems that lack SSE4. */
+ if ((rval & AV_CPU_FLAG_SSSE3) && !(rval & AV_CPU_FLAG_SSE4) &&
+ model < 23)
+ rval |= AV_CPU_FLAG_SSSE3SLOW;
}
#endif /* cpuid */
--
2.5.0
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