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

; 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"

@.str = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  br label %5

5:                                                ; preds = %37, %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %34, %5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = icmp slt i32 %7, 40
  br i1 %8, label %10, label %9

9:                                                ; preds = %6
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %37

10:                                               ; preds = %6
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %11 = load i32, ptr %2, align 4, !tbaa !5
  %12 = sext i32 %11 to i64
  %13 = getelementptr inbounds i32, ptr inttoptr (i64 8388608 to ptr), i64 %12
  %14 = load i32, ptr %13, align 4, !tbaa !5
  store i32 %14, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store ptr %3, ptr %4, align 8, !tbaa !9
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = load i32, ptr %3, align 4, !tbaa !5
  %17 = load ptr, ptr %4, align 8, !tbaa !9
  %18 = getelementptr inbounds i8, ptr %17, i64 0
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = sext i8 %19 to i32
  %21 = load ptr, ptr %4, align 8, !tbaa !9
  %22 = getelementptr inbounds i8, ptr %21, i64 1
  %23 = load i8, ptr %22, align 1, !tbaa !11
  %24 = sext i8 %23 to i32
  %25 = load ptr, ptr %4, align 8, !tbaa !9
  %26 = getelementptr inbounds i8, ptr %25, i64 2
  %27 = load i8, ptr %26, align 1, !tbaa !11
  %28 = sext i8 %27 to i32
  %29 = load ptr, ptr %4, align 8, !tbaa !9
  %30 = getelementptr inbounds i8, ptr %29, i64 3
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = sext i8 %31 to i32
  %33 = call i32 (ptr, ...) @printf(ptr noundef @.str, i32 noundef %15, i32 noundef %16, i32 noundef %20, i32 noundef %24, i32 noundef %28, i32 noundef %32)
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  br label %34

34:                                               ; preds = %10
  %35 = load i32, ptr %2, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %2, align 4, !tbaa !5
  br label %6, !llvm.loop !12

37:                                               ; preds = %9
  %38 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  %39 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  br label %5
}

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

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

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

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"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}


; 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"

@.str = external hidden unnamed_addr constant [18 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nofree noreturn nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  br label %4

1:                                                ; preds = %4
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  %3 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  br label %.backedge

4:                                                ; preds = %.backedge, %0
  %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.be, %.backedge ]
  %5 = getelementptr inbounds i32, ptr inttoptr (i64 8388608 to ptr), i64 %indvars.iv
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %sext = shl i32 %6, 24
  %7 = ashr exact i32 %sext, 24
  %8 = shl i32 %6, 16
  %9 = ashr i32 %8, 24
  %10 = shl i32 %6, 8
  %11 = ashr i32 %10, 24
  %12 = ashr i32 %6, 24
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  %14 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str, i32 noundef %13, i32 noundef %6, i32 noundef %7, i32 noundef %9, i32 noundef %11, i32 noundef %12)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, 40
  br i1 %exitcond.not, label %1, label %.backedge

.backedge:                                        ; preds = %4, %1
  %indvars.iv.be = phi i64 [ %indvars.iv.next, %4 ], [ 0, %1 ]
  br label %4, !llvm.loop !9
}

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

attributes #0 = { nofree 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 = { 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" }

!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"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass