[MLIR][Arith][Resubmit] add fastMathAttr on arith::extf and arith::truncf #95346
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ZhennanQin
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Hardcode84
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Add an
fastMathAttronarith::extfandarith::truncf. If these twoops are inserted by some promotion passes (like legalize-to-f32 /
emulate-unsupported-floats), they will be labeled as
FastMathFlags::contract, denoting that they can be theneliminated by canonicalizer.The
eliminationcan help improve performance, while may introduce somenumerical differences.