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Author SHA1 Message Date
Ahmed Bougacha 02b7b56af8 [X86] Bump Darwin MaxVectorAlign to 64 when AVX512 is enabled. 
Without this, 64-byte vector types (__m512), specified to be 64-byte
aligned in the AVX512 draft SysV ABI, will only be 32-byte aligned.

This is analoguous to AVX, for which we accept 32-byte max alignment.

Differential Revision: http://reviews.llvm.org/D10724

llvm-svn: 246230
 2015-08-27 22:42:12 +00:00
Ahmed Bougacha 82b619ea68 [X86] Conditionalize Darwin MaxVectorAlign on the presence of AVX. 
There's no point in using a larger alignment if we have no instructions
that would benefit from it.

Differential Revision: http://reviews.llvm.org/D12389

llvm-svn: 246229
 2015-08-27 22:30:38 +00:00
Chad Rosier cc40ea7f9a Add a per target max vector alignment field (e.g., 32-byte alignment for x86 due to 
AVX).  Currently, if no aligned attribute is specified the alignment of a vector is
inferred from its size.  Thus, very large vectors will be over-aligned with no 
benefit.  Target owners should set this target max.

llvm-svn: 160209
 2012-07-13 23:57:43 +00:00