Intel Processor Clock-cycle calculation

Unknown

Hi, I was wondering if anyone has a document that lists

the number of clock cycles each instruction takes

depending on the operands or processor or whatever.

I've got a copy of the Intel developer cd-rom from the

website but it doesn't seem to have this info. or if it

does I can't seem to find it. Anyways, if anyone has

any info. regarding this it would be appreciated.

Thanks.

Unknown

You can find these listed in the "Ralph Brown's Interrupt List" (file "OPCODE.LST"), for all processors (up to Pentium). There is a link to an on-line version in the "Assembler" forum. I don't remember from were I downloaded it, but you can search the Net for "INTER59A.ZIP" (and INTER##B..G .ZIP; 7 parts in 7 archives).

However, note that because of the architecture of newer precessors (2 pipelines, unordered/ speculative execution), "real-world" timings are extremely variable. From Intel, I have dowloaded some time ago the "Intel Architecture Optimization Manual" (doc # 242816), that lists how instructions pair and their breakdown by microoperations; this can give you an idea of how fast is executed each instructions. I expect this to be present on the CD (and downloadable from Intel's site).