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Write a simple description of the 'target triple' directive. This should be expanded. PR8976.

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llvm-svn: 193014
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Bill Wendling 2013-10-18 23:41:25 +00:00
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docs/LangRef.rst
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@ -1178,6 +1178,30 @@ don't have to specify the string. This will disable some optimizations
that require precise layout information, but this also prevents those
optimizations from introducing target specificity into the IR.
.. _langref_triple:
Target Triple
-------------
A module may specify a target triple string that describes the target
host. The syntax for the target triple is simply:
.. code-block:: llvm
target triple = "x86_64-apple-macosx10.7.0"
The *target triple* string consists of a series of identifiers delimited
by the minus sign character ('-'). The canonical forms are:
::
ARCHITECTURE-VENDOR-OPERATING_SYSTEM
ARCHITECTURE-VENDOR-OPERATING_SYSTEM-ENVIRONMENT
This information is passed along to the backend so that it generates
code for the proper architecture. It's possible to override this on the
command line with the ``-mtriple`` command line option.
.. _pointeraliasing:
Pointer Aliasing Rules