4 Commits

Author	SHA1	Message	Date
Nikita Popov	9f6e9cf71b	[ConstantFolding] Fold undef for integer intrinsics ... This fixes https://bugs.llvm.org/show_bug.cgi?id=40110. This implements handling of undef operands for integer intrinsics in ConstantFolding, in particular for the bitcounting intrinsics (ctpop, cttz, ctlz), the with.overflow intrinsics, the saturating math intrinsics and the funnel shift intrinsics. The undef behavior follows what InstSimplify does for the general cas e of non-constant operands. For the bitcount intrinsics (where InstSimplify doesn't do undef handling -- there cannot be a combination of an undef + non-constant operand) I'm using a 0 result if the intrinsic is defined for zero and undef otherwise. Differential Revision: https://reviews.llvm.org/D55950 llvm-svn: 350971	2019-01-11 21:18:00 +00:00
Nikita Popov	41a7b109c3	[ConstantFolding] Add tests for funnel shifts with undef operands; NFC ... llvm-svn: 349803	2018-12-20 19:46:39 +00:00
Sanjay Patel	411b86081e	[ConstantFolding] add simplifications for funnel shift intrinsics ... This is another step towards being able to canonicalize to the funnel shift intrinsics in IR (see D49242 for the initial patch). We should not have any loss of simplification power in IR between these and the equivalent IR constructs. Differential Revision: https://reviews.llvm.org/D50848 llvm-svn: 340022	2018-08-17 13:23:44 +00:00
Sanjay Patel	0ea8d8b951	[ConstantFolding] add tests for funnel shift intrinsics; NFC ... No functionality for this yet. llvm-svn: 339889	2018-08-16 16:10:42 +00:00