[LLVMdev] Using CostModel to estimate machine cycles of each instruction

Chandler Carruth
2014-08-04T17:15:25Z

On Wed, Jul 16, 2014 at 7:10 PM, <donney.blue at gmail.com> wrote:

> There is CostModel.cpp since LLVM3, I am wondering if anyone can give me
> an concrete example on how to use this pass to estimate cycles used in a
> given IR file.
>

While others have given specific advice about using the cost model
analysis, note that it isn't actually measuring the expected cycles. At
best it is measuring the size / number of instructions in the LLVM IR.
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