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* [ValueTracking] return zero when there's conflict in known bits of a shift ↵Sanjay Patel2017-10-121-10/+4
| | | | | | | | (PR34838) Poison allows us to return a better result than undef. llvm-svn: 315595
* The patch improves ValueTracking on left shift with nsw flag.Evgeny Stupachenko2016-08-241-0/+55
| | | | | | | | | | | | Summary: The patch fixes PR28946. Reviewers: majnemer, sanjoy Differential Revision: http://reviews.llvm.org/D23296 From: Li Huang llvm-svn: 279684
* Revert "[ValueTracking] Improve ValueTracking on left shift with nsw flag"Sanjoy Das2016-08-151-24/+0
| | | | | | This reverts commit r278172. It causes PR28946. llvm-svn: 278740
* [ValueTracking] Improve ValueTracking on left shift with nsw flagAndrew Kaylor2016-08-091-0/+24
Patch by Li Huang Differential Revison: https://reviews.llvm.org/D23296 llvm-svn: 278172
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