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README16-Dec-2014859

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