On 11/17/2017 03:50 PM, Qing Zhao wrote: >> >> The difficulty is tracking when exposure leads to these secondary >> opportunities. I often end up looking for this kind of stuff by first >> identifying many source files where the transformation applies. Then I >> generate dumps & assembly code for the transformation in each candidate >> location. I first analyze the assembly files for differences. If an >> assembly file shows a difference, then I look more closely to try and >> characterize the difference and if it looks interesting, then I work >> backwards to the dump files for more details. > > usually, what kind of benchmarks or test cases are you recommending? > I used to work a lot with SPEC, not sure whether that’s the same for working > in GCC? SPEC is always good. Many of us also work with GCC's sources themselves to help determine if a particluar transformation is helpful.
Jeff
