Tim Northover 91c8173093 GlobalISel: support overflow arithmetic intrinsics. ...

Unsigned addition and subtraction can reuse the instructions created to
legalize large width operations (i.e. both produce and consume a carry flag).
Signed operations and multiplies get a dedicated op-with-overflow instruction.

Once this is produced the two values are combined into a struct register (which
will almost always be merged with a corresponding G_EXTRACT as part of
legalization).

llvm-svn: 279278

2016-08-19 17:17:06 +00:00

5.5 KiB

Raw Blame History

View Raw