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2019 Jun 25
3
Potential missed optimisation with SEH funclets
I’ve been experimenting with SEH handling in LLVM, and it seems like the unwind funclets generated by LLVM are much larger than those generated by Microsoft’s CL compiler.
I used the following code as a test:
void test() {
MyClass x;
externalFunction();
}
Compiling with CL, the unwind funclet that destroys ‘x’ is just two lines of asm:
lea rcx, QWORD PTR x$[rdx]
jmp ??1MyClass@@QEAA at XZ