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[Unity] Ignore R.ExternFunc in EliminateCommonSubexpr #15900

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merged 1 commit into from
Oct 11, 2023
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[Unity] Ignore R.ExternFunc in EliminateCommonSubexpr #15900

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2 changes: 1 addition & 1 deletion src/relax/transform/eliminate_common_subexpr.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -94,7 +94,7 @@ class SubexprCounter : public ExprVisitor {
if (!(e->IsInstance<VarNode>() || e->IsInstance<DataflowVarNode>() ||
e->IsInstance<GlobalVarNode>() || e->IsInstance<tvm::OpNode>() ||
e->IsInstance<PrimValueNode>() || e->IsInstance<StringImmNode>() ||
e->IsInstance<ShapeExprNode>() ||
e->IsInstance<ShapeExprNode>() || e->IsInstance<ExternFuncNode>() ||
(e.as<ConstantNode>() && (e.as<ConstantNode>()->is_scalar())))) {
// also if e has an impure subexpression, we will not deduplicate it
if (!impurity_detector_.Detect(e)) {
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14 changes: 14 additions & 0 deletions tests/python/relax/test_transform_cse.py
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Expand Up @@ -276,5 +276,19 @@ def foo(x: R.Tensor((2, 3), dtype="float32"), y: R.Tensor((2, 3), dtype="float32
verify(Before, Expected)


def test_do_not_eliminate_extern_func():
@I.ir_module
class Before:
@R.function(pure=False)
def foo(x: R.Tensor((2, 3), dtype="float32")):
y = R.call_packed("extern_func_name", x, sinfo_args=R.Tensor([2, 3]))
z = R.call_packed("extern_func_name", y, sinfo_args=R.Tensor([2, 3]))
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If this was commoned before, then something else is probably wrong. This is equivalent to extern_func(extern_func(x)), so there is no opportunity to common anything even if the external function was known to be pure.

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Previously, it wasn't a computational step that was being extracted as the common subexpression, but the R.ExternFunc object itself.

@I.ir_module
class Module:
    @R.function(pure=False)
    def foo(x: R.Tensor((2, 3), dtype="float32")):
        gv = R.ExternFunc("extern_func_name")
        y = gv(x, sinfo_args=(R.Tensor((2, 3)),))
        z = gv(y, sinfo_args=(R.Tensor((2, 3)),))
        return z

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I see. Yeah, that seems unnecessary.

return z

Expected = Before

verify(Before, Expected)


if __name__ == "__main__":
tvm.testing.main()