Allow custom importing of files and syntactic sugar

[wsmoses]

No description provided.

[wsmoses]

@samuelpmishLLNL @samuelpmish the syntactic sugar is now functional and added ehre (and tested).

[ivanradanov]

@wsmoses What do you think about having the tblgen entries be input filename - output filename pairs (e.g. enzyme/enzyme.in -> enzyme/enzyme) and then we can have the contents of the headers in separate files which will be valid C/C++ (would be better for editing)

I can try to implement that if you think it is better

[ivanradanov]

@wsmoses
I have not figured out what exactly happens but there seems to be a bug somewhere either in clang/llvm or the autodiff/tuple templates as the sugar.cpp test ends up with something like:

define linkonce_odr dso_local { double, double } @_ZN6enzyme8autodiffIRFdddEJRNS_6activeIdEES5_EEEDaOT_DpOT0_(ptr noundef nonnull %f, ptr noundef nonnull align 8 dereferenceable(8) %args, ptr noundef nonnull align 8 dereferenceable(8) %args1) local_unnamed_addr #4 comdat {
entry:
  %ref.tmp = alloca %"struct.enzyme::tuple.1", align 8
  %ref.tmp3 = alloca %"struct.enzyme::tuple.6", align 8
  %ref.tmp4 = alloca %"struct.enzyme::tuple.6", align 8
  call void @llvm.lifetime.start.p0(i64 32, ptr nonnull %ref.tmp) #11
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %ref.tmp3) #11
  %0 = load i32, ptr @enzyme_out, align 4, !tbaa !5
  %1 = load double, ptr %args, align 8, !tbaa !9
  %.fca.0.insert.i = insertvalue { i32, double } poison, i32 %0, 0
  %.fca.1.insert.i = insertvalue { i32, double } %.fca.0.insert.i, double %1, 1
  %2 = extractvalue { i32, double } %.fca.1.insert.i, 0
  store i32 %2, ptr %ref.tmp3, align 8
  %3 = getelementptr inbounds { i32, double }, ptr %ref.tmp3, i64 0, i32 1
  %4 = extractvalue { i32, double } %.fca.1.insert.i, 1
  store double %4, ptr %3, align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %ref.tmp4) #11
  %5 = load i32, ptr @enzyme_out, align 4, !tbaa !5
  %6 = load double, ptr %args1, align 8, !tbaa !9
  %.fca.0.insert.i10 = insertvalue { i32, double } poison, i32 %5, 0
  %.fca.1.insert.i11 = insertvalue { i32, double } %.fca.0.insert.i10, double %6, 1
  %7 = extractvalue { i32, double } %.fca.1.insert.i11, 0
  store i32 %7, ptr %ref.tmp4, align 8
  %8 = getelementptr inbounds { i32, double }, ptr %ref.tmp4, i64 0, i32 1
  %9 = extractvalue { i32, double } %.fca.1.insert.i11, 1
  store double %9, ptr %8, align 8
  %10 = load i32, ptr %ref.tmp, align 8, !tbaa !5
  %add.ptr.i.i.i = getelementptr inbounds i8, ptr %ref.tmp, i64 8
  %11 = load double, ptr %add.ptr.i.i.i, align 8, !tbaa !12
  %add.ptr.i9.i.i = getelementptr inbounds i8, ptr %ref.tmp, i64 16
  %12 = load i32, ptr %add.ptr.i9.i.i, align 8, !tbaa !5
  %add.ptr.i10.i.i = getelementptr inbounds i8, ptr %ref.tmp, i64 24
  %13 = load double, ptr %add.ptr.i10.i.i, align 8, !tbaa !12
  %call4.i.i = call { double, double } @_Z17__enzyme_autodiffIN6enzyme5tupleIJddEEEJPvididEET_DpT0_(ptr noundef nonnull %f, i32 noundef %10, double noundef %11, i32 noundef %12, double noundef %13)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %ref.tmp4) #11
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %ref.tmp3) #11
  call void @llvm.lifetime.end.p0(i64 32, ptr nonnull %ref.tmp) #11
  ret { double, double } %call4.i.i

Which becomes

  %call4.i.i = call { double, double } @_Z17__enzyme_autodiffIN6enzyme5tupleIJddEEEJPvididEET_DpT0_(ptr noundef nonnull %f, i32 noundef undef, double noundef undef, i32 noundef undef, double noundef undef)

Note the undefs.

[ivanradanov]

That fixed it on my side