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Author SHA1 Message Date
David Majnemer 5116993f8e Add support for __builtin_alloca_with_align 
__builtin_alloca always uses __BIGGEST_ALIGNMENT__ for the alignment of
the allocation.  __builtin_alloca_with_align allows the programmer to
specify the alignment of the allocation.

This fixes PR30658.

llvm-svn: 285544
 2016-10-31 05:37:48 +00:00
David Majnemer 1878da43ea [CodeGen] Provide an appropriate alignment for dynamic allocas 
GCC documents __builtin_alloca as aligning the storage to at least
__BIGGEST_ALIGNMENT__.

MSVC documents essentially the same for the x64 ABI:
https://msdn.microsoft.com/en-us/library/x9sx5da1.aspx

The 32-bit ABI follows the same rule: it emits a call to _alloca_probe_16

Differential Revision: https://reviews.llvm.org/D24378

llvm-svn: 285316
 2016-10-27 17:18:24 +00:00
Reid Kleckner 59e4a6f5e2 -fms-extensions: Recognize _alloca as an alias for the alloca builtin 
Differential Revision: http://llvm-reviews.chandlerc.com/D1989

llvm-svn: 194617
 2013-11-13 22:58:53 +00:00