[clang] Document llvm options controlling pragma unroll

Reviewed by: Artem Belevich

Differential Revision: https://reviews.llvm.org/D105035

diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index d638121..f14f986 100644 (file)
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -3410,6 +3410,9 @@ to the same code size limit as with ``unroll(enable)``.
 
 Unrolling of a loop can be prevented by specifying ``unroll(disable)``.
 
+Loop unroll parameters can be controlled by options
+`-mllvm -unroll-count=n` and `-mllvm -pragma-unroll-threshold=n`.
+
 Loop Distribution
 -----------------