[llvm] [LoopVectorize] Fix divide-by-zero bug (#80836) (PR #81721)
David Sherwood via llvm-commits
llvm-commits at lists.llvm.org
Wed Feb 14 02:36:45 PST 2024
================
@@ -2106,18 +2106,20 @@ class GeneratedRTChecks {
BestTripCount = *EstimatedTC;
}
- InstructionCost NewMemCheckCost = MemCheckCost / BestTripCount;
+ if (BestTripCount > 1) {
----------------
david-arm wrote:
It's definitely simpler from a code point of view, but it's also mis-leading when we print out a debug message saying "Reduced costs from 6 to 6". So I thought it made sense to simply avoid doing the work and confusing the user.
https://github.com/llvm/llvm-project/pull/81721
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