llvm-project

Commit Graph

Author	SHA1	Message	Date
Tim Northover	f8bfe21fad	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	b94f0859e5	AArch64: support f16 extend/trunc operations. llvm-svn: 213375	2014-07-18 13:01:31 +00:00
Tim Northover	20bd0ced30	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

Author

SHA1

Message

Date

Tim Northover

f8bfe21fad

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

b94f0859e5

AArch64: support f16 extend/trunc operations.

llvm-svn: 213375

2014-07-18 13:01:31 +00:00

Tim Northover

20bd0ced30

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

3 Commits