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Implement inalloca codegen for x86 with the new inalloca design

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Calls with inalloca are lowered by skipping all stores for arguments
passed in memory and the initial stack adjustment to allocate argument
memory.

Now the frontend is responsible for the memory layout, and the backend
doesn't have to do any work.  As a result these changes are pretty
minimal.

Reviewers: echristo

Differential Revision: http://llvm-reviews.chandlerc.com/D2637

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200596 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2014-01-31 23:50:57 +00:00
parent cb6684b63b
commit 8a24e83550
13 changed files with 251 additions and 17 deletions
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5
docs/LangRef.rst
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@@ -792,7 +792,10 @@ Currently, only the following parameter attributes are defined:
An argument allocation may be used by a call at most once because
the call may deallocate it. The ``inalloca`` attribute cannot be
used in conjunction with other attributes that affect argument
storage, like ``inreg``, ``nest``, ``sret``, or ``byval``.
storage, like ``inreg``, ``nest``, ``sret``, or ``byval``. The
``inalloca`` attribute also disables LLVM's implicit lowering of
large aggregate return values, which means that frontend authors
must lower them with ``sret`` pointers.
When the call site is reached, the argument allocation must have
been the most recent stack allocation that is still live, or the