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Mark inactive Fortran calls #3194

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4bb636b
Treat LLVM flang's I/O runtime and type queries as inactive
vchuravy Aug 5, 2026
b52ae59
Rework comments for clarity
joewallwork Sep 8, 2026
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3 changes: 3 additions & 0 deletions enzyme/Enzyme/ActivityAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -227,6 +227,7 @@ bool isInactiveCall(CallBase &CI) {
// clang-format off
const char *KnownInactiveFunctionsStartingWith[] = {
"f90io",
"_FortranAio", // LLVM flang's I/O runtime (modern equivalent of f90io)
"$ss5print",
"strcpy",
"_ZTv0_n24_NSoD", //"1Ev, 0Ev
Expand All @@ -240,6 +241,8 @@ const char *KnownInactiveFunctionsContains[] = {
"__enzyme_pointer", "__enzyme_ignore_derivatives"};

const StringSet<> KnownInactiveFunctions = {
"_FortranAClassIs", // Fortran runtime queries
"_FortranATrim", // Fortran character handling
"mpfr_greater_p",
"__nv_isnand",
"__nv_isnanf",
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12 changes: 9 additions & 3 deletions enzyme/Enzyme/AdjointGenerator.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3628,9 +3628,15 @@ class AdjointGenerator : public llvm::InstVisitor<AdjointGenerator> {
minInt = pair.first[0];
mv = pair.second;
}
assert(mv != BaseType::Unknown);
vd.insert({0}, mv);
goto known;
// Note the comparison above is unsigned, so an entry at the
// any-offset index -1 is skipped and mv is left unknown. That
// is the common shape for a tree such as {[]:Pointer,
// [-1]:Anything}, so fall through to the diagnostics below
// rather than assuming a type was found.
if (mv != BaseType::Unknown) {
vd.insert({0}, mv);
goto known;
}
}
}
}
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