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Remove -simplify-libcalls pass form Passes documentation 

This pass was removed in r184459.

Also added note that the InstCombine pass does library call
simplification.

Patch slightly modified from one by Daniel Liew
<daniel.liew@imperial.ac.uk>!

llvm-svn: 206650
This commit is contained in:
Reid Kleckner 2014-04-18 21:19:06 +00:00
parent d0d38bf91e
commit 0177e18c51
1 changed files with 10 additions and 9 deletions
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19
llvm/docs/Passes.rst
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@ -540,6 +540,8 @@ instructions that are obviously dead.
A trivial dead store elimination that only considers basic-block local A trivial dead store elimination that only considers basic-block local
redundant stores. redundant stores.
.. _passes-functionattrs:
``-functionattrs``: Deduce function attributes ``-functionattrs``: Deduce function attributes
---------------------------------------------- ----------------------------------------------
@ -648,7 +650,7 @@ program, and is used for a wide variety of program transformations.
------------------------------------------------ ------------------------------------------------
Combine instructions to form fewer, simple instructions. This pass does not Combine instructions to form fewer, simple instructions. This pass does not
modify the CFG This pass is where algebraic simplification happens. modify the CFG. This pass is where algebraic simplification happens.
This pass combines things like: This pass combines things like:
@ -681,6 +683,13 @@ program:
shifts. shifts.
#. … etc. #. … etc.
This pass can also simplify calls to specific well-known function calls (e.g.
runtime library functions). For example, a call ``exit(3)`` that occurs within
the ``main()`` function can be transformed into simply ``return 3``. Whether or
not library calls are simplified is controlled by the
:ref:`-functionattrs <passes-functionattrs>` pass and LLVM's knowledge of
library calls on different targets.
``-internalize``: Internalize Global Symbols ``-internalize``: Internalize Global Symbols
-------------------------------------------- --------------------------------------------
@ -1011,14 +1020,6 @@ as:
Note that this pass has a habit of making definitions be dead. It is a good Note that this pass has a habit of making definitions be dead. It is a good
idea to run a :ref:`DCE <passes-dce>` pass sometime after running this pass. idea to run a :ref:`DCE <passes-dce>` pass sometime after running this pass.
``-simplify-libcalls``: Simplify well-known library calls
---------------------------------------------------------
Applies a variety of small optimizations for calls to specific well-known
function calls (e.g. runtime library functions). For example, a call
``exit(3)`` that occurs within the ``main()`` function can be transformed into
simply ``return 3``.
.. _passes-simplifycfg: .. _passes-simplifycfg:
``-simplifycfg``: Simplify the CFG ``-simplifycfg``: Simplify the CFG