; LLVM IR from BrunoLevy/learn-fpga :: FemtoRV/FIRMWARE/EXAMPLES (hello)

; 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.GLFont = type { ptr, i8, i8 }

@Font8x16 = external constant %struct.GLFont, align 8
@.str = external hidden unnamed_addr constant [91 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  call void @GL_set_font(ptr noundef @Font8x16)
  br label %3

3:                                                ; preds = %3, %0
  %4 = load volatile i32, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  %5 = xor i32 %4, -1
  %6 = and i32 %5, 1
  store volatile i32 %6, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  call void @milliwait(i32 noundef 500)
  %7 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  call void @milliwait(i32 noundef 500)
  %8 = load i32, ptr %2, align 4, !tbaa !5
  %9 = add nsw i32 %8, 1
  store i32 %9, ptr %2, align 4, !tbaa !5
  %10 = load volatile i32, ptr inttoptr (i64 6291456 to ptr), align 4, !tbaa !5
  %11 = lshr i32 %10, 16
  %12 = and i32 %11, 1023
  %13 = load i32, ptr %2, align 4, !tbaa !5
  %14 = load volatile i32, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  %15 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i32 noundef %12, i32 noundef %13, i32 noundef %14)
  br label %3
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @GL_set_font(ptr noundef) #2

declare void @milliwait(i32 noundef) #2

declare i32 @printf(ptr noundef, ...) #2

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" }
attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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" }
attributes #3 = { nounwind }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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"

%struct.GLFont = type { ptr, i8, i8 }

@Font8x16 = external constant %struct.GLFont, align 8
@.str = external hidden unnamed_addr constant [91 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [37 x i8], align 1

; Function Attrs: noreturn nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  tail call void @GL_set_font(ptr noundef nonnull @Font8x16) #3
  br label %1

1:                                                ; preds = %1, %0
  %.0 = phi i32 [ 0, %0 ], [ %6, %1 ]
  %2 = load volatile i32, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  %3 = and i32 %2, 1
  %4 = xor i32 %3, 1
  store volatile i32 %4, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  tail call void @milliwait(i32 noundef 500) #3
  %5 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  tail call void @milliwait(i32 noundef 500) #3
  %6 = add nuw nsw i32 %.0, 1
  %7 = load volatile i32, ptr inttoptr (i64 6291456 to ptr), align 2097152, !tbaa !5
  %8 = lshr i32 %7, 16
  %9 = and i32 %8, 1023
  %10 = load volatile i32, ptr inttoptr (i64 4194308 to ptr), align 4, !tbaa !5
  %11 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i32 noundef %9, i32 noundef %6, i32 noundef %10)
  br label %1
}

declare void @GL_set_font(ptr noundef) local_unnamed_addr #1

declare void @milliwait(i32 noundef) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

attributes #0 = { noreturn 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" }
attributes #1 = { "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" }
attributes #2 = { nofree nounwind "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" }
attributes #3 = { nounwind }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass