Where to find the optimization sequence for clang -OX?

9
votes

Where can I find the sequence of optimizations used by clang according to -OX?

1
clangllvm
Apart from the source code, that is? – user395760

1 Answers

17
votes

clang executes the precisely same sequence of passes as opt -ON. So, you can do something like 

llvm-as < /dev/null | opt -O3 -disable-output -debug-pass=Arguments

to derive the "full" set of passes which are run at O3.