Rafael Auler cc4b2fb614 [BOLT] Efficient edge profiling in instrumented mode ... Summary: Change our edge profiling technique when using instrumentation to do not instrument every edge. Instead, build the spanning tree for the CFG and omit instrumentation for edges in the spanning tree. Infer the edge count for these edges when writing the profile during run time. The inference works with a bottom-up traversal of the spanning tree and establishes the value of the edge connecting to the parent based on a simple flow equation involving output and input edges, where the only unknown variable is the parent edge. This requires some engineering in the runtime lib to support dynamic allocation for building these graphs at runtime. (cherry picked from FBD17062773)		2019-08-07 16:09:50 -07:00
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CMakeLists.txt	[BOLT] Efficient edge profiling in instrumented mode	2019-08-07 16:09:50 -07:00
instr.cpp	[BOLT] Efficient edge profiling in instrumented mode	2019-08-07 16:09:50 -07:00