[cfe-dev] Different results between O1 flag and O1 passes entered manually

[Peter Conn]

Hello,

I'm compiling my C code to IR, using opt and then compiling into a binary.
I'm getting different runtimes when I use 'opt -O1' and when I use 'opt
-debug-pass=Arguments' and then copy the list of flags into opt. Why could
this be?

Essentially I'm trying to track down which optimizations cause a speedup
(so I extracted the list of optimizations and am running opt repeatedly
with individual optimizations removed).

Thanks,
Peter
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