; LLVM IR from Stephane-D/SGDK :: src/ext/flash-save (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"

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nounwind uwtable
define dso_local signext i16 @flash_read(i64 noundef %0, ptr noundef %1, i16 noundef zeroext %2) #1 {
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i16, align 2
  %7 = alloca i16, align 2
  %8 = alloca ptr, align 8
  %9 = alloca i16, align 2
  store i64 %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store i16 %2, ptr %6, align 2, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 2, ptr %7) #2
  %10 = load i16, ptr %6, align 2, !tbaa !11
  %11 = zext i16 %10 to i32
  %12 = ashr i32 %11, 1
  %13 = trunc i32 %12 to i16
  store i16 %13, ptr %7, align 2, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %14 = load ptr, ptr %5, align 8, !tbaa !9
  store ptr %14, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %9) #2
  store i16 0, ptr %9, align 2, !tbaa !11
  br label %15

15:                                               ; preds = %29, %3
  %16 = load i16, ptr %9, align 2, !tbaa !11
  %17 = zext i16 %16 to i32
  %18 = load i16, ptr %7, align 2, !tbaa !11
  %19 = zext i16 %18 to i32
  %20 = icmp slt i32 %17, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 2, ptr %9) #2
  br label %34

22:                                               ; preds = %15
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = call zeroext i16 @bus_read16(i64 noundef %23)
  %25 = load ptr, ptr %8, align 8, !tbaa !9
  %26 = load i16, ptr %9, align 2, !tbaa !11
  %27 = zext i16 %26 to i64
  %28 = getelementptr inbounds i16, ptr %25, i64 %27
  store i16 %24, ptr %28, align 2, !tbaa !11
  br label %29

29:                                               ; preds = %22
  %30 = load i16, ptr %9, align 2, !tbaa !11
  %31 = add i16 %30, 1
  store i16 %31, ptr %9, align 2, !tbaa !11
  %32 = load i64, ptr %4, align 8, !tbaa !5
  %33 = add i64 %32, 2
  store i64 %33, ptr %4, align 8, !tbaa !5
  br label %15, !llvm.loop !13

34:                                               ; preds = %21
  %35 = load i16, ptr %7, align 2, !tbaa !11
  %36 = zext i16 %35 to i32
  %37 = shl i32 %36, 1
  %38 = trunc i32 %37 to i16
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 2, ptr %7) #2
  ret i16 %38
}

; Function Attrs: nounwind uwtable
declare hidden zeroext i16 @bus_read16(i64 noundef) #1 section ".ramprog"

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 = !{!"long", !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 = !{!12, !12, i64 0}
!12 = !{!"short", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

; Function Attrs: nounwind uwtable
define dso_local noundef signext range(i16 0, -1) i16 @flash_read(i64 noundef %0, ptr nocapture noundef writeonly %1, i16 noundef zeroext %2) local_unnamed_addr #0 {
  %.not = icmp ult i16 %2, 2
  br i1 %.not, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %3
  %4 = lshr i16 %2, 1
  %wide.trip.count = zext nneg i16 %4 to i64
  br label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %3
  %5 = and i16 %2, -2
  ret i16 %5

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %.0911 = phi i64 [ %0, %.lr.ph.preheader ], [ %8, %.lr.ph ]
  %6 = tail call zeroext i16 @bus_read16(i64 noundef %.0911)
  %7 = getelementptr inbounds i16, ptr %1, i64 %indvars.iv
  store i16 %6, ptr %7, align 2, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = add i64 %.0911, 2
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9
}

; Function Attrs: nounwind uwtable
declare hidden zeroext i16 @bus_read16(i64 noundef) local_unnamed_addr #0 section ".ramprog"

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 = !{!"short", !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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SCCPPass,SROAPass,SimplifyCFGPass,TailCallElimPass