Enzyme Incompatible Return Type

[jpmedinagl]

Based on the new EnzymeAD/rust#162, enzyme could not autodiff through any function that returns integers.

$ RUSTFLAGS="-Z autodiff=LooseTypes" cargo +enzyme run --release --bin update
...
Attribute 'range(i32 0, 2)' applied to incompatible type!
ptr @fakeaugmented_CINTset_pairdata
...
rustc-LLVM ERROR: function failed verification (2)

LLVM-IR compressed

define noundef range(i32 0, 2) i32 @preprocess_CINT1e_loop(ptr nocapture readnone %0, ptr noundef %1, ptr noundef %2, i32 %3) unnamed_addr #108 {
  ...

88:                                               ; preds = %84, %4
  %89 = phi i32 [ 1, %84 ], [ 0, %4 ]
  ret i32 %89
}

; Function Attrs: mustprogress nounwind nonlazybind sanitize_hwaddress willreturn uwtable
define internal range(i32 0, 2) { ptr } @fakeaugmented_CINT1e_loop(ptr nocapture readnone %0, ptr noundef %1, ptr %2, ptr noundef %3, ptr %4, i32 %5) unnamed_addr #108 {
  ...

116:                                              ; preds = %110, %6
  ret { ptr } undef
}