Jan,
This breakage appears related to your changes.
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/home/cygnus/dnovillo/perf/sbox/tree-ssa-branch/local.ppc64/src/gcc/
builtins.c:5941: warning: 'result' might be used uninitialized in
this function
It is not in functio I've touched. It looks like that one of our
optimizations confuse CFG enought so there is new path to exit not
initializing result (the result is initialized in many interesting ways
inside switch statement).
I would suspect that this is result of combination of fact that edge
splitting is broken (it redirects CFG edges without updating the
underlying program code and it also invalidate SSA form by not updating
PHI nodes for new edges as noticed by verify_flow_info patch I sent)
and Daniel's changes to make ssapre more aggressive.