Hello, In the test case for PR54146, compute_global_livein allocates/frees a worklist for >400,000 basic blocks on each invocation. And it's called a lot, for rewrite_into_loop_closed_ssa. But the maximum number of basic blocks ever on the work list was only ~6500. So the work list can be much smaller most of the time.
Bootstrapped&tested on x86_64-unknown-linux-gnu. OK for trunk? Ciao! Steven
PR54146_cgli.diff
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