llvm /
llvm /
3ddad0b0b188880d74774950b08bf0320868ff38 [CVP] Deduce no-wrap on `mul`
Summary:
`ConstantRange::makeGuaranteedNoWrapRegion()` knows how to deal with `mul`
since rL335646, there is exhaustive test coverage.
This is already used by CVP's `processOverflowIntrinsic()`,
and by SCEV's `StrengthenNoWrapFlags()`
That being said, currently, this doesn't help much in the end:
| statistic | old | new | delta | percentage |
| correlated-value-propagation.NumMulNSW | 4 | 275 | 271 | 6775.00% |
| correlated-value-propagation.NumMulNUW | 4 | 1323 | 1319 | 32975.00% |
| correlated-value-propagation.NumMulNW | 8 | 1598 | 1590 | 19875.00% |
| correlated-value-propagation.NumNSW | 5715 | 5986 | 271 | 4.74% |
| correlated-value-propagation.NumNUW | 9193 | 10512 | 1319 | 14.35% |
| correlated-value-propagation.NumNW | 14908 | 16498 | 1590 | 10.67% |
| instcount.NumAddInst | 275871 | 275869 | -2 | 0.00% |
| instcount.NumBrInst | 708234 | 708232 | -2 | 0.00% |
| instcount.NumMulInst | 43812 | 43810 | -2 | 0.00% |
| instcount.NumPHIInst | 316786 | 316784 | -2 | 0.00% |
| instcount.NumTruncInst | 62165 | 62167 | 2 | 0.00% |
| instcount.NumUDivInst | 2528 | 2526 | -2 | -0.08% |
| instcount.TotalBlocks | 842995 | 842993 | -2 | 0.00% |
| instcount.TotalInsts | 7376486 | 7376478 | -8 | 0.00% |
(^ test-suite plain, tests still pass)
Reviewers: nikic, reames, luqmana, sanjoy, timshen
Reviewed By: reames
Subscribers: hiraditya, javed.absar, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69203
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@375396 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed
