; LLVM IR from smv1999/CompetitiveProgrammingQuestionBank :: Bit Manipulation/rotate_bits.ll (Z16left_rotate_bitsii)

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_Z16left_rotate_bitsii(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %6 = load i32, ptr %4, align 4, !tbaa !5
  %7 = srem i32 %6, 31
  store i32 %7, ptr %4, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %20, %2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, 0
  br i1 %10, label %11, label %23

11:                                               ; preds = %8
  %12 = load i32, ptr %3, align 4, !tbaa !5
  %13 = ashr i32 %12, 31
  %14 = and i32 %13, 1
  store i32 %14, ptr %5, align 4, !tbaa !5
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = shl i32 %15, 1
  store i32 %16, ptr %3, align 4, !tbaa !5
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %5, align 4, !tbaa !5
  %19 = or i32 %17, %18
  store i32 %19, ptr %3, align 4, !tbaa !5
  br label %20

20:                                               ; preds = %11
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = add nsw i32 %21, -1
  store i32 %22, ptr %4, align 4, !tbaa !5
  br label %8, !llvm.loop !9

23:                                               ; preds = %8
  %24 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %24
}

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

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

attributes #0 = { mustprogress 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 = { 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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @_Z16left_rotate_bitsii(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = srem i32 %1, 31
  %4 = icmp sgt i32 %3, 0
  br i1 %4, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %xtraiter = and i32 %3, 7
  %lcmp.mod.not = icmp eq i32 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol

.lr.ph.prol:                                      ; preds = %.lr.ph.preheader, %.lr.ph.prol
  %.010.prol = phi i32 [ %5, %.lr.ph.prol ], [ %0, %.lr.ph.preheader ]
  %.089.prol = phi i32 [ %6, %.lr.ph.prol ], [ %3, %.lr.ph.preheader ]
  %prol.iter = phi i32 [ %prol.iter.next, %.lr.ph.prol ], [ 0, %.lr.ph.preheader ]
  %5 = tail call i32 @llvm.fshl.i32(i32 %.010.prol, i32 %.010.prol, i32 1)
  %6 = add nsw i32 %.089.prol, -1
  %prol.iter.next = add i32 %prol.iter, 1
  %prol.iter.cmp.not = icmp eq i32 %prol.iter.next, %xtraiter
  br i1 %prol.iter.cmp.not, label %.lr.ph.prol.loopexit, label %.lr.ph.prol, !llvm.loop !5

.lr.ph.prol.loopexit:                             ; preds = %.lr.ph.prol, %.lr.ph.preheader
  %.010.unr = phi i32 [ %0, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %.089.unr = phi i32 [ %3, %.lr.ph.preheader ], [ %6, %.lr.ph.prol ]
  %.lcssa.unr = phi i32 [ poison, %.lr.ph.preheader ], [ %5, %.lr.ph.prol ]
  %7 = icmp ult i32 %3, 8
  br i1 %7, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.prol.loopexit, %.lr.ph
  %.010 = phi i32 [ %15, %.lr.ph ], [ %.010.unr, %.lr.ph.prol.loopexit ]
  %.089 = phi i32 [ %16, %.lr.ph ], [ %.089.unr, %.lr.ph.prol.loopexit ]
  %8 = tail call i32 @llvm.fshl.i32(i32 %.010, i32 %.010, i32 1)
  %9 = tail call i32 @llvm.fshl.i32(i32 %8, i32 %8, i32 1)
  %10 = tail call i32 @llvm.fshl.i32(i32 %9, i32 %9, i32 1)
  %11 = tail call i32 @llvm.fshl.i32(i32 %10, i32 %10, i32 1)
  %12 = tail call i32 @llvm.fshl.i32(i32 %11, i32 %11, i32 1)
  %13 = tail call i32 @llvm.fshl.i32(i32 %12, i32 %12, i32 1)
  %14 = tail call i32 @llvm.fshl.i32(i32 %13, i32 %13, i32 1)
  %15 = tail call i32 @llvm.fshl.i32(i32 %14, i32 %14, i32 1)
  %16 = add nsw i32 %.089, -8
  %17 = add i32 %.089, -9
  %18 = icmp ult i32 %17, -2
  br i1 %18, label %.lr.ph, label %._crit_edge, !llvm.loop !7

._crit_edge:                                      ; preds = %.lr.ph.prol.loopexit, %.lr.ph, %2
  %.0.lcssa = phi i32 [ %0, %2 ], [ %.lcssa.unr, %.lr.ph.prol.loopexit ], [ %15, %.lr.ph ]
  ret i32 %.0.lcssa
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.fshl.i32(i32, i32, i32) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.unroll.disable"}
!7 = distinct !{!7, !8}
!8 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass