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[TVM] Fix negating undefined in DetectLinearEquation #1816

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Merged
tqchen merged 1 commit into from
Oct 4, 2018
Merged

[TVM] Fix negating undefined in DetectLinearEquation #1816

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3 changes: 2 additions & 1 deletion src/arithmetic/detect_linear_equation.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -111,8 +111,9 @@ class LinearEqDetector
return ComputeExpr<Add>(a, b);
}
Expr SubCombine(Expr a, Expr b) {
if (!a.defined()) return -b;
// Check b first in case they are both undefined
if (!b.defined()) return a;
if (!a.defined()) return -b;
return ComputeExpr<Sub>(a, b);
}
Expr MulCombine(Expr a, Expr b) {
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4 changes: 4 additions & 0 deletions tests/python/unittest/test_arith_detect_linear_equation.py
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Expand Up @@ -38,6 +38,10 @@ def test_multivariate():
assert(m[2].value == 2)
assert(m[len(m)-1].value == 2)

m = tvm.arith.DetectLinearEquation((v[0] - v[1]), [v[2]])
assert(m[0].value == 0)
assert(tvm.ir_pass.Simplify(m[1] - (v[0] - v[1])).value == 0)

if __name__ == "__main__":
test_basic()
test_multivariate()