GCC vs. LLVM-GCC Benchmarks

[lwatcdr]

Not always

code size!=less resources

Yes you can have a tiny code size and then allocate a dynamically allocate lots of memory. You can also use a terrible amount of CPU but you will often find smaller code does equal fewer resources.

[deanjo]

Yes you can have a tiny code size and then allocate a dynamically allocate lots of memory. You can also use a terrible amount of CPU but you will often find smaller code does equal fewer resources.

You would be surprised. There was a SLE bug filed a ways back by an ISV that reports VM intensive microbenchmark slows down by about 45%, and real world (for them) performance drop by 10-20% by using -Os rather than -O2 in SLES11 kernel.

This was verified by another ISV as well.

[wizard69]

No it is a new approach top to bottom.

Shouldn't make any difference, Clang is just the frontend, right?

This has likely been answered already but it has the potential to make a huge difference. I say potential because CLang is no where near what most people would call mature. In any event authoritative answers can be had on the LLVMM and CLang web sites.

Dave

[wizard69]

I'm wondering when we are going to see the CLang tests?

Not to rush the cook in the kitchen but how is the testing of CLang coming along. I fully realize it is a compiler fresh from the oven but the question is does it lead to tasty code or do the bits end up in the dogs dish?

As a new flavor for our bit baking endeavors I want to know if CLang is ready to spice up our code. Apple seems to think it is close to being ready for a topping of ice cream and to call it the best desert ever. I'm a bit reluctant and would like to see the test test results of others, before serving up CLang with my special sauces.


Dave

[ioannis]

Not to rush the cook in the kitchen but how is the testing of CLang coming along. I fully realize it is a compiler fresh from the oven but the question is does it lead to tasty code or do the bits end up in the dogs dish?

As a new flavor for our bit baking endeavors I want to know if CLang is ready to spice up our code. Apple seems to think it is close to being ready for a topping of ice cream and to call it the best desert ever. I'm a bit reluctant and would like to see the test test results of others, before serving up CLang with my special sauces.


Dave

damn it! now I'm hungry...