Re:Make LLVM Fast Again
by fnord123 on Monday May 11, 2020 @07:50AM
(#23141103)
For fast compiles, in clang, -fsyntax-only parses as quick as possible. Then you have -O{0,1,2,3s} for various levels of optimization.
As for the long baking compile, you have a concept of super compilation which will check the branches and determine if there are any places where a function is called with constants and partially evaluate (similar to partial application / prameter binding, but you get a newly compiled function) the function with those constants frozen. But then it has to determine if the branch elision makes it worth dropping the other versions of the function. It's a cool topic that I researched a lot about a decade ago but I think it's not an area with a lot of active interest in AOT compilers.
As for the long baking compile, you have a concept of super compilation which will check the branches and determine if there are any places where a function is called with constants and partially evaluate (similar to partial application / prameter binding, but you get a newly compiled function) the function with those constants frozen. But then it has to determine if the branch elision makes it worth dropping the other versions of the function. It's a cool topic that I researched a lot about a decade ago but I think it's not an area with a lot of active interest in AOT compilers.
https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.50....
http://wiki.c2.com/?SuperCompiler
https://en.wikipedia.org/wiki/Stalin_(Scheme_implementation)