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a1a5594ad2
Adds wide integer emulation support for the `arith.subi` op. `(i2N, i2N) -> (i2N)` ops are emulated as `(vector<2xiN>, vector<2xiN>) -> (vector<2xiN>)`, just as the other emulation patterns. The emulation uses the following scheme: ``` resLow = lhsLow - rhsLow; // carry = 1 if rhsLow > lhsLow resHigh = lhsLow - carry - rhsLow; ``` Signed-off-by: Ege Beysel <beysel@roofline.ai>