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x86: cpu: Detect Conroe CPUs and their slow shuffle unit

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Fiona Glaser 2016-01-14 10:54:27 +01:00 committed by Diego Biurrun
parent 7d7355aa92
commit 8e9cd81d29
1 changed files with 6 additions and 0 deletions
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6
libavutil/x86/cpu.c
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@ -221,6 +221,12 @@ int ff_get_cpu_flags_x86(void)
* functions on the Atom. */
if (family == 6 && 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) &&
family == 6 && model < 23)
rval |= AV_CPU_FLAG_SSSE3SLOW;
}
#endif /* cpuid */