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Resolve BigInt conflicts by matching IntImm directly and avoid int64 conversion and host exponent subtraction. Keep five minimal regression cases in the existing lower-intrin test file, reusing its lowering helper without a standalone test module. Validation: all five regressions fail with upstream intrin_rule.cc and pass with the patched implementation. Related Python tests: 1042 passed, 57 skipped, 8 xfailed. Changed-file pre-commit passed. The unchanged C++ implementation also passed the previous 640-case numerical oracle and three LowerIntrin smoke checks.
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Handle runtime operands, zero-exponent scaling, and integer per-axis flags. Restrict the fast path to Q31.
Fixes #20340.
Fixes tile-ai/tilelang#3014.
Fixes tile-ai/tilelang#3003.
Fixes tile-ai/tilelang#3006.