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Minor update to the stack map documentation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205513 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2014-04-03 07:03:28 +00:00
parent 1233d41ff4
commit 3b8ad82b39
1 changed files with 10 additions and 4 deletions
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14
docs/StackMaps.rst
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@ -400,6 +400,11 @@ immediately after compiling a module and encode the information in its
own format. Since the runtime controls the allocation of sections, it
can reuse the same stack map space for multiple modules.
..
Stackmap support is currently only implemented for 64-bit
platforms. However, a 32-bit implementation should be able to use
the same format with an insignificant amount of wasted space.
.. _stackmap-section:
Stack Map Section
@ -454,10 +459,11 @@ program could crash before the runtime could take back control.
To enforce these semantics, stackmap and patchpoint intrinsics are
considered to potentially read and write all memory. This may limit
optimization more than some clients desire. To address this problem
meta-data could be added to the intrinsic call to express aliasing,
thereby allowing optimizations to hoist certain loads above stack
maps.
optimization more than some clients desire. This limitation may be
avoided by marking the call site as "readonly". In the future we may
also allow meta-data to be added to the intrinsic call to express
aliasing, thereby allowing optimizations to hoist certain loads above
stack maps.
Direct Stack Map Entries
^^^^^^^^^^^^^^^^^^^^^^^^