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[nfc][mlir][scf]: Define scf.for lower/upper bounds can be also negative or zero #117534

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Dec 14, 2024
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[nfc][mlir][scf]: Define scf.for lower/upper bounds can be also negative or zero #117534

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7 changes: 4 additions & 3 deletions mlir/include/mlir/Dialect/SCF/IR/SCFOps.td
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Expand Up @@ -153,9 +153,10 @@ def ForOp : SCF_Op<"for",
operation defines an SSA value for its induction variable. It has one
region capturing the loop body. The induction variable is represented as an
argument of this region. This SSA value is a signless integer or index.
The step is a value of same type but required to be positive. The lower and
upper bounds specify a half-open range: the range includes the lower bound
but does not include the upper bound.
The step is a value of same type but required to be positive, the lower and
upper bounds can be also negative or zero. The lower and upper bounds specify
a half-open range: the iteration is executed iff the signed comparison of induction
variable value is less than the upper bound and bigger or equal to the lower bound.

The body region must contain exactly one block that terminates with
`scf.yield`. Calling ForOp::build will create such a region and insert
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