[llvm-dev] Global removal pass - potential for improvement?

[Karl Rehm via llvm-dev]

Hey everyone,
I was looking into how the global optimization pass fares against things
like what's reported in https://bugs.llvm.org/show_bug.cgi?id=44676
Looking at this, I think it would be pretty trivial to optimize that down
given that there are already threading assumptions made:
https://godbolt.org/z/u6ZqoB
Is this something I can look into? Another thing is that currently *all*
external calls break this optimization, including calls to intrinsics that
probably shouldn't: https://godbolt.org/z/pK7Cew
Maybe add some sort of way (i.e. an attribute) to mark that a call can be
optimized through in this way?
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