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Diffstat (limited to 'llvm/docs')
| -rw-r--r-- | llvm/docs/LangRef.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 197439f5750..cd57c24e9ae 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -4711,6 +4711,27 @@ which is the string ``llvm.loop.licm_versioning.disable``. For example: !0 = !{!"llvm.loop.licm_versioning.disable"} +'``llvm.loop.distribute.enable``' Metadata +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Loop distribution allows splitting a loop into multiple loops. Currently, +this is only performed if the entire loop cannot be vectorized due to unsafe +memory dependencies. The transformation will atempt to isolate the unsafe +dependencies into their own loop. + +This metadata can be used to selectively enable or disable distribution of the +loop. The first operand is the string ``llvm.loop.distribute.enable`` and the +second operand is a bit. If the bit operand value is 1 distribution is +enabled. A value of 0 disables distribution: + +.. code-block:: llvm + + !0 = !{!"llvm.loop.distribute.enable", i1 0} + !1 = !{!"llvm.loop.distribute.enable", i1 1} + +This metadata should be used in conjunction with ``llvm.loop`` loop +identification metadata. + '``llvm.mem``' ^^^^^^^^^^^^^^^ |
