; LLVM IR from Stephane-D/SGDK :: src (memory)

; 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"

@heap = external hidden global ptr, align 8

; 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 zeroext i16 @MEM_getFree() #1 {
  %1 = alloca ptr, align 8
  %2 = alloca i16, align 2
  %3 = alloca i16, align 2
  call void @llvm.lifetime.start.p0(i64 8, ptr %1) #2
  %4 = load ptr, ptr @heap, align 8, !tbaa !5
  store ptr %4, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 2, ptr %2) #2
  store i16 0, ptr %2, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %3) #2
  br label %5

5:                                                ; preds = %22, %0
  %6 = load ptr, ptr %1, align 8, !tbaa !5
  %7 = load i16, ptr %6, align 2, !tbaa !9
  store i16 %7, ptr %3, align 2, !tbaa !9
  %8 = zext i16 %7 to i32
  %9 = icmp ne i32 %8, 0
  br i1 %9, label %10, label %29

10:                                               ; preds = %5
  %11 = load i16, ptr %3, align 2, !tbaa !9
  %12 = zext i16 %11 to i32
  %13 = and i32 %12, 1
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %22, label %15

15:                                               ; preds = %10
  %16 = load i16, ptr %3, align 2, !tbaa !9
  %17 = zext i16 %16 to i32
  %18 = load i16, ptr %2, align 2, !tbaa !9
  %19 = zext i16 %18 to i32
  %20 = add nsw i32 %19, %17
  %21 = trunc i32 %20 to i16
  store i16 %21, ptr %2, align 2, !tbaa !9
  br label %22

22:                                               ; preds = %15, %10
  %23 = load i16, ptr %3, align 2, !tbaa !9
  %24 = zext i16 %23 to i32
  %25 = ashr i32 %24, 1
  %26 = load ptr, ptr %1, align 8, !tbaa !5
  %27 = sext i32 %25 to i64
  %28 = getelementptr inbounds i16, ptr %26, i64 %27
  store ptr %28, ptr %1, align 8, !tbaa !5
  br label %5, !llvm.loop !11

29:                                               ; preds = %5
  %30 = load i16, ptr %2, align 2, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 2, ptr %3) #2
  call void @llvm.lifetime.end.p0(i64 2, ptr %2) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %1) #2
  ret i16 %30
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@heap = external hidden local_unnamed_addr global ptr, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local zeroext i16 @MEM_getFree() local_unnamed_addr #0 {
  %1 = load ptr, ptr @heap, align 8, !tbaa !5
  %2 = load i16, ptr %1, align 2, !tbaa !9
  %.not9 = icmp eq i16 %2, 0
  br i1 %.not9, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %3 = phi i16 [ %10, %.lr.ph ], [ %2, %0 ]
  %.011 = phi ptr [ %9, %.lr.ph ], [ %1, %0 ]
  %.0610 = phi i16 [ %spec.select, %.lr.ph ], [ 0, %0 ]
  %4 = zext i16 %3 to i32
  %5 = and i32 %4, 1
  %.not8 = icmp eq i32 %5, 0
  %6 = select i1 %.not8, i16 %3, i16 0
  %spec.select = add i16 %6, %.0610
  %7 = lshr i32 %4, 1
  %8 = zext nneg i32 %7 to i64
  %9 = getelementptr inbounds i16, ptr %.011, i64 %8
  %10 = load i16, ptr %9, align 2, !tbaa !9
  %.not = icmp eq i16 %10, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %.lr.ph, %0
  %.06.lcssa = phi i16 [ 0, %0 ], [ %spec.select, %.lr.ph ]
  ret i16 %.06.lcssa
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) 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, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass