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[LLVM] Add target feature string to function attributes #6763

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Oct 26, 2020
Merged

[LLVM] Add target feature string to function attributes #6763

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5 changes: 5 additions & 0 deletions src/target/llvm/codegen_llvm.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -172,6 +172,11 @@ void CodeGenLLVM::AddFunctionInternal(const PrimFunc& f, bool ret_void) {
}
#endif

llvm::StringRef fs = target_machine_->getTargetFeatureString();
if (!fs.empty()) {
function_->addFnAttr("target-features", fs);
}

if (ret_void) {
builder_->CreateRetVoid();
} else {
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16 changes: 16 additions & 0 deletions tests/python/unittest/test_target_codegen_hexagon.py
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Expand Up @@ -63,6 +63,21 @@ def check_add(offload):
check_add(False)


def test_llvm_target_features():
if not check_prereq_and_setup():
return
target = tvm.target.hexagon("v66", hvx=128)
# Define some trivial compute
A = tvm.te.placeholder((128,), dtype="uint8", name="A")
C = tvm.te.compute((128,), lambda i: A[i] + 1, name="C")
s = tvm.te.create_schedule(C.op)
m = tvm.build(s, [C, A], target=target, target_host=target, name="add_one")
llvm_ir = m.get_source("ll")
# Make sure we find +hvx-length128b in "attributes".
fs = re.findall(r"attributes.*\+hvx-length128b", llvm_ir)
assert fs # Check that it's non-empty


def test_alloc_vtcm():
if not check_prereq_and_setup():
return
Expand Down Expand Up @@ -92,4 +107,5 @@ def test_alloc_vtcm():

if __name__ == "__main__":
test_basic()
test_llvm_target_features()
test_alloc_vtcm()