[Mlir-commits] [mlir] [mlir][scf] Fix front peeling skipped due to float rounding in trip count (PR #231100)
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Mon Oct 12 22:24:56 PDT 2026
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git-clang-format --diff origin/main HEAD --extensions cpp -- mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp --diff_from_common_commit
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``````````diff
diff --git a/mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp b/mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp
index e46b588a2..70e37a386 100644
--- a/mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp
+++ b/mlir/lib/Dialect/SCF/Transforms/LoopSpecialization.cpp
@@ -238,12 +238,12 @@ LogicalResult mlir::scf::peelForLoopFirstIteration(RewriterBase &b, ForOp forOp,
auto ubInt = getConstantIntValue(forOp.getUpperBound());
auto stepInt = getConstantIntValue(forOp.getStep());
- // Peeling is not needed if there is at most one iteration.
+ // Peeling is not needed if there is at most one iteration.
// Per the scf.for semantics, the trip count is
// max(0, ceil((UB - LB) / Step)), so for a positive step there is more than
- // one iteration exactly when UB - LB > Step.
- // Compare the integers directly: going through float is lossy and wrongly skipped
- // peeling of loops with two iterations.
+ // one iteration exactly when UB - LB > Step.
+ // Compare the integers directly: going through float is lossy and wrongly
+ // skipped peeling of loops with two iterations.
if (lbInt && ubInt && stepInt && *ubInt - *lbInt <= *stepInt)
return failure();
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https://github.com/llvm/llvm-project/pull/231100
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