Fixes undominating relaxed loads issue

[oota-llvm.git] / docs / StackMaps.rst

diff --git a/docs/StackMaps.rst b/docs/StackMaps.rst
index bd0fb946f9a50ea1bd5f4674aabe498ef24d7999..5bdae38b699dfbb40c8a7f1d79d9761b4ea95192 100644 (file)
--- a/docs/StackMaps.rst
+++ b/docs/StackMaps.rst
@@ -221,6 +221,11 @@ lowered according to the calling convention specified at the
 intrinsic's callsite. Variants of the intrinsic with non-void return
 type also return a value according to calling convention.
 
+On PowerPC, note that ``<target>`` must be the ABI function pointer for the
+intended target of the indirect call. Specifically, when compiling for the
+ELF V1 ABI, ``<target>`` is the function-descriptor address normally used as
+the C/C++ function-pointer representation.
+
 Requesting zero patch point arguments is valid. In this case, all
 variable operands are handled just like
 ``llvm.experimental.stackmap.*``. The difference is that space will
@@ -494,3 +499,13 @@ the same requirement imposed by the llvm.gcroot intrinsic.) LLVM
 transformations must not substitute the alloca with any intervening
 value. This can be verified by the runtime simply by checking that the
 stack map's location is a Direct location type.
+
+
+Supported Architectures
+=======================
+
+Support for StackMap generation and the related intrinsics requires 
+some code for each backend.  Today, only a subset of LLVM's backends 
+are supported.  The currently supported architectures are X86_64, 
+PowerPC, and Aarch64.
+