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raising error when constexpr combined with do_not_specialize #8275

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Merged
ThomasRaoux merged 2 commits into from
Sep 25, 2025
Merged

raising error when constexpr combined with do_not_specialize #8275

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b685ed8
#8273 raising error when constexpr combined with do_not_specialize
ryan-yide Sep 24, 2025
c40281c
Moving check to compile time code_generator
ryan-yide Sep 24, 2025
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13 changes: 13 additions & 0 deletions python/test/unit/language/test_compile_errors.py
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Original file line number Diff line number Diff line change
Expand Up @@ -476,3 +476,16 @@ def good_cube_kernel():
obtained_err_msg = str(e.value).split('\n')[-1]

assert expected_err_msg == obtained_err_msg


def test_err_constexpr_and_do_not_specialize():

@triton.jit(do_not_specialize=["N"])
def kernel(N: tl.constexpr):
pass

with pytest.raises(CompilationError, match="N marked as constexpr and listed in do_not_specialize"):
triton.compile(triton.compiler.ASTSource(fn=kernel, signature={}, constexprs={"N": 5}))

with pytest.raises(CompilationError, match="N marked as constexpr and listed in do_not_specialize"):
kernel[(1, )](5)
6 changes: 6 additions & 0 deletions python/triton/compiler/code_generator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -644,6 +644,12 @@ def visit_arguments(self, node):

def visit_arg(self, node):
ast.NodeVisitor.generic_visit(self, node)
param = next(p for p in self.jit_fn.params if p.name == node.arg)
if param.is_constexpr and (param.do_not_specialize or param.do_not_specialize_on_alignment):
raise CompilationError(
self.jit_fn.src, node,
f"{node.arg} marked as constexpr and listed in do_not_specialize/do_not_specialize_on_alignment. "
"Remove constexpr designation to skip specialization.")
return node.arg

def visit_AnnAssign(self, node):
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