[docs] Added description of `-f[no]-openmp-simd` option to UsersManual.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@321562 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst
index 023f9f5528ba494edc53ab29fb76c79bb04b6f82..9596fb1cbded486edbef0a9c3182c1f2c82271a6 100644 (file)
--- a/docs/UsersManual.rst
+++ b/docs/UsersManual.rst
@@ -2042,6 +2042,11 @@ directives, and ``#pragma omp taskgroup`` directive.
 Use `-fopenmp` to enable OpenMP. Support for OpenMP can be disabled with
 `-fno-openmp`.
 
+Use `-fopenmp-simd` to enable OpenMP simd features only, without linking
+the runtime library; for combined constructs
+(e.g. ``#pragma omp parallel for simd``) the non-simd directives and clauses
+will be ignored. This can be disabled with `-fno-openmp-simd`.
+
 Controlling implementation limits
 ---------------------------------