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Here are the flags from /proc/cpuinfo:

fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpid

I clearly have a pclmulqdq flag, but I'm not sure if it means PCLMUL instruction set support. How can I find what the flag means, or what flag PCLMUL corresponds to?

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1 Answer 1

up vote 2 down vote accepted

From the information available at Wikipedia and Intel, I'd assume that yes.

From the Wikipedia entry:

PCLMULQDQ   Performs a carry-less multiplication of two 64-bit integers 

which matches the flag you have.

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