; LLVM IR from BrunoLevy/learn-fpga :: FemtoRV/TUTORIALS/FROM_BLINKER_TO_RISCV/FIRMWARE/COREMARK (core_list_join)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

%struct.list_data_s = type { i16, i16 }

; Function Attrs: nounwind uwtable
define dso_local i32 @cmp_idx(ptr noundef %0, ptr noundef %1, ptr noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !5
  %7 = load ptr, ptr %6, align 8, !tbaa !5
  %8 = icmp eq ptr %7, null
  br i1 %8, label %9, label %40

9:                                                ; preds = %3
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.list_data_s, ptr %10, i32 0, i32 0
  %12 = load i16, ptr %11, align 2, !tbaa !9
  %13 = sext i16 %12 to i32
  %14 = and i32 %13, 65280
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  %16 = getelementptr inbounds %struct.list_data_s, ptr %15, i32 0, i32 0
  %17 = load i16, ptr %16, align 2, !tbaa !9
  %18 = sext i16 %17 to i32
  %19 = ashr i32 %18, 8
  %20 = and i32 255, %19
  %21 = or i32 %14, %20
  %22 = trunc i32 %21 to i16
  %23 = load ptr, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds %struct.list_data_s, ptr %23, i32 0, i32 0
  store i16 %22, ptr %24, align 2, !tbaa !9
  %25 = load ptr, ptr %5, align 8, !tbaa !5
  %26 = getelementptr inbounds %struct.list_data_s, ptr %25, i32 0, i32 0
  %27 = load i16, ptr %26, align 2, !tbaa !9
  %28 = sext i16 %27 to i32
  %29 = and i32 %28, 65280
  %30 = load ptr, ptr %5, align 8, !tbaa !5
  %31 = getelementptr inbounds %struct.list_data_s, ptr %30, i32 0, i32 0
  %32 = load i16, ptr %31, align 2, !tbaa !9
  %33 = sext i16 %32 to i32
  %34 = ashr i32 %33, 8
  %35 = and i32 255, %34
  %36 = or i32 %29, %35
  %37 = trunc i32 %36 to i16
  %38 = load ptr, ptr %5, align 8, !tbaa !5
  %39 = getelementptr inbounds %struct.list_data_s, ptr %38, i32 0, i32 0
  store i16 %37, ptr %39, align 2, !tbaa !9
  br label %40

40:                                               ; preds = %9, %3
  %41 = load ptr, ptr %4, align 8, !tbaa !5
  %42 = getelementptr inbounds %struct.list_data_s, ptr %41, i32 0, i32 1
  %43 = load i16, ptr %42, align 2, !tbaa !12
  %44 = sext i16 %43 to i32
  %45 = load ptr, ptr %5, align 8, !tbaa !5
  %46 = getelementptr inbounds %struct.list_data_s, ptr %45, i32 0, i32 1
  %47 = load i16, ptr %46, align 2, !tbaa !12
  %48 = sext i16 %47 to i32
  %49 = sub nsw i32 %44, %48
  ret i32 %49
}

attributes #0 = { nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 0}
!10 = !{!"list_data_s", !11, i64 0, !11, i64 2}
!11 = !{!"short", !7, i64 0}
!12 = !{!10, !11, i64 2}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local range(i32 -65535, 65536) i32 @cmp_idx(ptr nocapture noundef %0, ptr nocapture noundef %1, ptr noundef readnone %2) local_unnamed_addr #0 {
  %4 = icmp eq ptr %2, null
  br i1 %4, label %5, label %14

5:                                                ; preds = %3
  %6 = load i16, ptr %0, align 2, !tbaa !5
  %7 = and i16 %6, -256
  %8 = lshr i16 %6, 8
  %9 = or disjoint i16 %8, %7
  store i16 %9, ptr %0, align 2, !tbaa !5
  %10 = load i16, ptr %1, align 2, !tbaa !5
  %11 = and i16 %10, -256
  %12 = lshr i16 %10, 8
  %13 = or disjoint i16 %12, %11
  store i16 %13, ptr %1, align 2, !tbaa !5
  br label %14

14:                                               ; preds = %5, %3
  %15 = getelementptr inbounds i8, ptr %0, i64 2
  %16 = load i16, ptr %15, align 2, !tbaa !10
  %17 = sext i16 %16 to i32
  %18 = getelementptr inbounds i8, ptr %1, i64 2
  %19 = load i16, ptr %18, align 2, !tbaa !10
  %20 = sext i16 %19 to i32
  %21 = sub nsw i32 %17, %20
  ret i32 %21
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !7, i64 0}
!6 = !{!"list_data_s", !7, i64 0, !7, i64 2}
!7 = !{!"short", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!6, !7, i64 2}


; Effective O3 passes: BDCEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass