8 Commits

Author	SHA1	Message	Date
Nicola Zaghen	8a012cbabf	[InstCombine] Add new tests for icmp ugt/ult (add nuw X, C2), C ... Differential Revision: https://reviews.llvm.org/D51040 llvm-svn: 340284	2018-08-21 15:27:32 +00:00
Craig Topper	615729b305	[InstCombine] Remove a FIXME from a test that was fixed in r314025. ... llvm-svn: 314030	2017-09-22 21:47:20 +00:00
Craig Topper	3f364aa908	[InstCombine] Add constant splat handling to one of the ICMP_SLT/SGT cases in foldICmpUsingKnownBits. ... llvm-svn: 314025	2017-09-22 19:54:15 +00:00
Sanjay Patel	53c5c3d65d	[InstCombine] add nsw/nuw X, signbit --> or X, signbit ... Changing to 'or' (rather than 'xor' when no wrapping flags are set) allows icmp simplifies to happen as expected. Differential Revision: https://reviews.llvm.org/D29729 llvm-svn: 295574	2017-02-18 22:20:09 +00:00
Sanjay Patel	45b7e69fef	[InstCombine] fold icmp sgt/slt (add nsw X, C2), C --> icmp sgt/slt X, (C - C2) ... I found one special case of this transform for 'slt 0', so I removed that and added the general transform. Alive code to check correctness: Name: slt_no_overflow Pre: WillNotOverflowSignedSub(C1, C2) %a = add nsw i8 %x, C2 %b = icmp slt %a, C1 => %b = icmp slt %x, C1 - C2 Name: sgt_no_overflow Pre: WillNotOverflowSignedSub(C1, C2) %a = add nsw i8 %x, C2 %b = icmp sgt %a, C1 => %b = icmp sgt %x, C1 - C2 http://rise4fun.com/Alive/MH Differential Revision: https://reviews.llvm.org/D29774 llvm-svn: 294898	2017-02-12 16:40:30 +00:00
Sanjay Patel	b36e1f0223	[InstCombine] add tests for icmp with add nsw; NFC ... llvm-svn: 294601	2017-02-09 18:12:39 +00:00
Sanjay Patel	a62bc44f67	[InstCombine] add tests to show information-losing add nsw/nuw transforms; NFC ... llvm-svn: 294524	2017-02-08 22:14:11 +00:00
Sanjay Patel	d11a03b263	[InstCombine] add test for missed vector icmp fold; NFC ... Also, move the related existing scalar test to a renamed file where I'm planning to add more icmp-add tests. llvm-svn: 294487	2017-02-08 17:37:17 +00:00