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* [DAGCombiner] sub X, 0/1 --> add X, 0/-1Sanjay Patel2019-01-301-5/+2
| | | | | | | | | | This extends the existing transform for: add X, 0/1 --> sub X, 0/-1 ...to allow the sibling subtraction fold. This pattern could regress with the proposed change in D57401. llvm-svn: 352680
* [AArch64][x86] add tests for add/sub signbits fold; NFCSanjay Patel2019-01-301-0/+31
| | | | | | | As discussed/shown in D57401, we are missing a fold for subtract of 0/1 --> add 0/-1. llvm-svn: 352678
* [AArch64] add tests for vector bool math; NFCSanjay Patel2019-01-291-0/+29
llvm-svn: 352519
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