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3 Commits

Author SHA1 Message Date
Tim Northover
be8b73df94 AArch64: implement efficient f16 bitcasts 
Because i16 is illegal, there's no native DAG method to
represent a bitcast to or from an f16 type. This meant LLVM was
inserting a stack store/load pair which is really not ideal.

llvm-svn: 213378
 2014-07-18 13:07:05 +00:00
Tim Northover
1b266803fb AArch64: support f16 extend/trunc operations. 
llvm-svn: 213375
 2014-07-18 13:01:31 +00:00
Tim Northover
e4c93c0798 CodeGen: soften f16 type by default instead of marking legal. 
Actual support for softening f16 operations is still limited, and can be added
when it's needed.  But Soften is much closer to being a useful thing to try
than keeping it Legal when no registers can actually hold such values.

Longer term, we probably want something between Soften and Promote semantics
for most targets, it'll be more efficient to promote the 4 basic operations to
f32 than libcall them.

llvm-svn: 213372
 2014-07-18 12:41:46 +00:00