README
1 These are tests for instrumentation based profiling. This specifically means 2 the -fprofile-instr-generate and -fprofile-instr-use driver flags. 3 4 Tests in this directory should usually test both: 5 6 - the generation of instrumentation (-fprofile-instr-generate), and 7 - the use of profile data from instrumented runs (-fprofile-instr-use). 8 9 In order to test -fprofile-instr-use without actually running an instrumented 10 program, .profdata files are checked into Inputs/. 11 12 The input source files must include a main function such that building with 13 -fprofile-instr-generate and running the resulting program generates the same 14 .profdata file that is consumed by the tests for -fprofile-instr-use. Even 15 tests that only check -fprofile-instr-use should include such a main function, 16 so that profile data can be regenerated as the .profdata file format evolves. 17
