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Hello, Our SelectionDAG instruction selection mechanism prints out a very detailed and useful trace with the -debug option. Conversely, with -O0 when fast isel is running, there is no equivalent output. Instead, debugging has to rely on -fast-isel-verbose2 which just prints out statistics at the end of the run and -fast-isel-abort to catch places when selection aborted. But even simple tracing of which instructions were matched with isel and where it bailed out (along with a simple reason for bailing out - i.e. "target could not lower arguments&...