Google SoC Project Proposal: Better Uninitialized Warnings

[David Edelsohn]

>>>>> Joe Buck writes:

Joe> What worries me is that we can't afford to make -O0 run significantly
Joe> slower than it does now.  Cycle speeds are no longer increasing, we have
Joe> to be very careful about slowing things down.

	Adding more passes does not necessarily slow down the compiler, as
IBM found with XLC.  If one can remove enough dead code / statements /
insns / IR, one performs more processing on less data leading to less
overall work and faster compilation at -O0.

David