4 Commits

Author	SHA1	Message	Date
Sanjay Patel	8953ecf22b	[InstCombine] reassociate diff of sums into sum of diffs ... This is the integer sibling to D81491. (a[0] + a[1] + a[2] + a[3]) - (b[0] + b[1] + b[2] +b[3]) --> (a[0] - b[0]) + (a[1] - b[1]) + (a[2] - b[2]) + (a[3] - b[3]) Removing the "experimental" from these intrinsics is likely not too far away.	2020-06-22 20:47:09 -04:00
Sanjay Patel	7e1f376f80	[InstCombine] add tests for integer reductions; NFC	2020-06-22 20:47:09 -04:00
Sanjay Patel	b5fb26951a	[InstCombine] reassociate FP diff of sums into sum of diffs ... (a[0] + a[1] + a[2] + a[3]) - (b[0] + b[1] + b[2] +b[3]) --> (a[0] - b[0]) + (a[1] - b[1]) + (a[2] - b[2]) + (a[3] - b[3]) This should be the last step in solving PR43953: https://bugs.llvm.org/show_bug.cgi?id=43953 We started emitting reduction intrinsics with: D80867/ rGe50059f6b6b3 So it's a relatively easy pattern match now to re-order those ops. Also, I have not seen any complaints for the switch to intrinsics yet, so I'll propose to remove the "experimental" tag from the intrinsics soon. Differential Revision: https://reviews.llvm.org/D81491	2020-06-14 09:09:03 -04:00
Sanjay Patel	f71a3b54f0	[InstCombine] add tests for diff-of-sums; NFC	2020-06-09 15:33:38 -04:00