[all-commits] [llvm/llvm-project] 7cd7f4: [CVP] No-wrap deduction for `shl`

[Roman Lebedev via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 7cd7f4a83b7a4ab852734ad9188dde14dcfb5072
      https://github.com/llvm/llvm-project/commit/7cd7f4a83b7a4ab852734ad9188dde14dcfb5072
  Author: Roman Lebedev <lebedev.ri at gmail.com>
  Date:   2019-10-21 (Mon, 21 Oct 2019)

  Changed paths:
    M llvm/lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
    M llvm/test/Transforms/CorrelatedValuePropagation/icmp.ll
    M llvm/test/Transforms/CorrelatedValuePropagation/shl.ll

  Log Message:
  -----------
  [CVP] No-wrap deduction for `shl`

Summary:
This is the last `OverflowingBinaryOperator` for which we don't deduce flags.
D69217 taught `ConstantRange::makeGuaranteedNoWrapRegion()` about it.

The effect is better than of the `mul` patch (D69203):

| statistic                              |     old |     new | delta | % change |
| correlated-value-propagation.NumAddNUW |    7145 |    7144 |    -1 | -0.0140% |
| correlated-value-propagation.NumAddNW  |   12126 |   12125 |    -1 | -0.0082% |
| correlated-value-propagation.NumAnd    |     443 |     446 |     3 |  0.6772% |
| correlated-value-propagation.NumNSW    |    5986 |    7158 |  1172 | 19.5790% |
| correlated-value-propagation.NumNUW    |   10512 |   13304 |  2792 | 26.5601% |
| correlated-value-propagation.NumNW     |   16498 |   20462 |  3964 | 24.0272% |
| correlated-value-propagation.NumShlNSW |       0 |    1172 |  1172 |          |
| correlated-value-propagation.NumShlNUW |       0 |    2793 |  2793 |          |
| correlated-value-propagation.NumShlNW  |       0 |    3965 |  3965 |          |
| instcount.NumAShrInst                  |   13824 |   13790 |   -34 | -0.2459% |
| instcount.NumAddInst                   |  277584 |  277586 |     2 |  0.0007% |
| instcount.NumAndInst                   |   66061 |   66056 |    -5 | -0.0076% |
| instcount.NumBrInst                    |  709153 |  709147 |    -6 | -0.0008% |
| instcount.NumICmpInst                  |  483709 |  483708 |    -1 | -0.0002% |
| instcount.NumSExtInst                  |   79497 |   79496 |    -1 | -0.0013% |
| instcount.NumShlInst                   |   40691 |   40654 |   -37 | -0.0909% |
| instcount.NumSubInst                   |   61997 |   61996 |    -1 | -0.0016% |
| instcount.NumZExtInst                  |   68208 |   68211 |     3 |  0.0044% |
| instcount.TotalBlocks                  |  843916 |  843910 |    -6 | -0.0007% |
| instcount.TotalInsts                   | 7387528 | 7387448 |   -80 | -0.0011% |

Reviewers: nikic, reames, sanjoy, timshen

Reviewed By: nikic

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69277

llvm-svn: 375455