| Stephen Hines | 651f13c | 2014-04-23 16:59:28 -0700 | [diff] [blame] | 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. |