We are trying to implement a jit compiler whose performance is supposed to be same as doing it with clang -o4. Is there a place where I could easily get the list of optimization passes invoked by clang with -o4 is specified?
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We are trying to implement a jit compiler whose performance is supposed to be same as doing it with clang -o4. Is there a place where I could easily get the list of optimization passes invoked by clang with -o4 is specified?
As far as I know -O4 means same thing as -O3 + enabled LTO (Link Time Optimization).
See the folloing code fragments:
// Manually translate -O to -O2 and -O4 to -O3;// Check for -O4.Also see here:
For optimizations used with -O3 flag see this PassManagerBuilder.cpp file (look for OptLevel variable – it will have value 3).