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14 exceeds a threshold, we identify a hot loop and perform second-level
30 How do we keep track of which edges to instrument, and which edges are
41 3) Mark BBs which end in edges that exit the hot region; we need to
44 Assume that there is 1 free register. On SPARC we use %g1, which LLC
46 edge which corresponds to a conditional branch, we shift 0 for not
48 through the hot region. Silently fail if we need more than 64 bits.
50 At the end BB we call countPath and increment the counter based on %g1
56 together to form our trace. But we do not allow more than 5 paths; if
57 we have more than 5 we take the ones that are executed the most.  We
58 verify our assumption that we picked a hot back-edge in first-level
59 instrumentation, by making sure that the number of times we took an
75 We have a SIGALRM timer that counts time for us. Every time we get a
76 SIGALRM we look at our priority queue of locations where we have
78 with a time when we will next turn instrumentation back on for that
79 call site. If the time has arrived for a particular call site, we pop
87 When we finally generate an optimized trace we first copy the code
96 each machine code basic block we think is in the hot region into the
97 trace cache. Then we instrument that code. The process is similar for
98 generating the final optimized trace; we copy the same basic blocks
99 because we might need to put in fixup code for exit BBs.
105 original code, trace, and instrumented code. So we have to keep the
111 We use a dummy function that is full of a bunch of for loops which we
113 whether or not we have enough space in the trace cache, etc.
125 replacement policy; we have found that this is almost as good as LRU