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HowToBuildWithPGO.rst: Fix a few details in the manual steps 

Differential revision: https://reviews.llvm.org/D55268

llvm-svn: 348342
This commit is contained in:
Hans Wennborg 2018-12-05 08:35:30 +00:00
parent c361e0d627
commit 45562a3aba
1 changed files with 3 additions and 3 deletions
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6
llvm/docs/HowToBuildWithPGO.rst
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@ -125,12 +125,12 @@ In more detailed steps:
It's recommended to build the ``all`` target with your instrumented Clang,
since more coverage is often better.
b. You should now have a few ``*.profdata`` files in
b. You should now have a few ``*.profraw`` files in
``path/to/stage2/profiles/``. You need to merge these using
``llvm-profdata`` (even if you only have one! The profile merge transforms
profraw into actual profile data, as well). This can be done with
``/path/to/stage1/llvm-profdata -merge
-output=/path/to/output/profdata.prof path/to/stage2/profiles/*.profdata``.
``/path/to/stage1/llvm-profdata merge
-output=/path/to/output/profdata.prof path/to/stage2/profiles/*.profraw``.
4. Now, build your final, PGO-optimized Clang. To do this, you'll want to pass
the following additional arguments to CMake.