I've just commited a small patch that gives bugpoint the smarts to run the optimizations through valgrind when searching for errors. Pass "--enable-valgrind" to bugpoint and it will use Valgrind to test for memory errors when minimizing a testcase. When using this, you might also want to pass the -timeout=0 option, as Valgrind is about 25-50x slower than native. (The default timeout is 5 minutes.) Nick Lewycky
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