https://bugs.llvm.org/show_bug.cgi?id=51761
Bug ID: 51761
Summary: SCEV: loop trip count computation for loops *-or-equal
comparisons
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
The motivation is:
https://godbolt.org/z/dYeWcvz6T
We fail to compute the trip count, and fail to vectorize.
Let's ignore the lowering of the OpenMP for a second (it may be suboptimal.)
Indeed, support for ULE/UGE is missing in
ScalarEvolution::computeExitLimitFromICmp()
I think the formula is:
https://godbolt.org/z/q61j4cf5K https://alive2.llvm.org/ce/z/htSXXe
Now, ignorant question: i'm guessing this is much more complicated
than just asking `ScalarEvolution::howManyLessThans()`
and incrementing the result?
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