; LLVM IR from ravireddy07/cpp-book :: src/Matrices/MatrixChainMulti.ll (Z3MCMPiii)

; 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 uwtable
define dso_local noundef i32 @_Z3MCMPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  %11 = load i32, ptr %6, align 4, !tbaa !9
  %12 = load i32, ptr %7, align 4, !tbaa !9
  %13 = sub nsw i32 %11, %12
  %14 = call i32 @llvm.abs.i32(i32 %13, i1 true)
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %16, label %17

16:                                               ; preds = %3
  store i32 0, ptr %4, align 4
  br label %68

17:                                               ; preds = %3
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #3
  store i32 2147483647, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  %18 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %18, ptr %9, align 4, !tbaa !9
  br label %19

19:                                               ; preds = %63, %17
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = load i32, ptr %7, align 4, !tbaa !9
  %22 = sub nsw i32 %21, 2
  %23 = icmp sle i32 %20, %22
  br i1 %23, label %25, label %24

24:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  br label %66

25:                                               ; preds = %19
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %26 = load ptr, ptr %5, align 8, !tbaa !5
  %27 = load i32, ptr %6, align 4, !tbaa !9
  %28 = load i32, ptr %9, align 4, !tbaa !9
  %29 = add nsw i32 %28, 1
  %30 = call noundef i32 @_Z3MCMPiii(ptr noundef %26, i32 noundef %27, i32 noundef %29)
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load i32, ptr %9, align 4, !tbaa !9
  %33 = add nsw i32 %32, 1
  %34 = load i32, ptr %7, align 4, !tbaa !9
  %35 = call noundef i32 @_Z3MCMPiii(ptr noundef %31, i32 noundef %33, i32 noundef %34)
  %36 = add nsw i32 %30, %35
  %37 = load ptr, ptr %5, align 8, !tbaa !5
  %38 = load i32, ptr %6, align 4, !tbaa !9
  %39 = sub nsw i32 %38, 1
  %40 = sext i32 %39 to i64
  %41 = getelementptr inbounds i32, ptr %37, i64 %40
  %42 = load i32, ptr %41, align 4, !tbaa !9
  %43 = load ptr, ptr %5, align 8, !tbaa !5
  %44 = load i32, ptr %9, align 4, !tbaa !9
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds i32, ptr %43, i64 %45
  %47 = load i32, ptr %46, align 4, !tbaa !9
  %48 = mul nsw i32 %42, %47
  %49 = load ptr, ptr %5, align 8, !tbaa !5
  %50 = load i32, ptr %7, align 4, !tbaa !9
  %51 = sub nsw i32 %50, 1
  %52 = sext i32 %51 to i64
  %53 = getelementptr inbounds i32, ptr %49, i64 %52
  %54 = load i32, ptr %53, align 4, !tbaa !9
  %55 = mul nsw i32 %48, %54
  %56 = add nsw i32 %36, %55
  store i32 %56, ptr %10, align 4, !tbaa !9
  %57 = load i32, ptr %10, align 4, !tbaa !9
  %58 = load i32, ptr %8, align 4, !tbaa !9
  %59 = icmp slt i32 %57, %58
  br i1 %59, label %60, label %62

60:                                               ; preds = %25
  %61 = load i32, ptr %10, align 4, !tbaa !9
  store i32 %61, ptr %8, align 4, !tbaa !9
  br label %62

62:                                               ; preds = %60, %25
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  br label %63

63:                                               ; preds = %62
  %64 = load i32, ptr %9, align 4, !tbaa !9
  %65 = add nsw i32 %64, 1
  store i32 %65, ptr %9, align 4, !tbaa !9
  br label %19, !llvm.loop !11

66:                                               ; preds = %24
  %67 = load i32, ptr %8, align 4, !tbaa !9
  store i32 %67, ptr %4, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #3
  br label %68

68:                                               ; preds = %66, %16
  %69 = load i32, ptr %4, align 4
  ret i32 %69
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #2

attributes #0 = { mustprogress 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) }
attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !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"

; Function Attrs: mustprogress nofree nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local noundef i32 @_Z3MCMPiii(ptr noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = sub nsw i32 %1, %2
  %5 = tail call i32 @llvm.abs.i32(i32 %4, i1 true)
  %6 = icmp eq i32 %5, 1
  br i1 %6, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %3
  %7 = add nsw i32 %2, -2
  %.not27 = icmp slt i32 %7, %1
  br i1 %.not27, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader
  %invariant.gep25 = getelementptr i8, ptr %0, i64 -4
  %8 = sext i32 %1 to i64
  %gep = getelementptr i32, ptr %invariant.gep25, i64 %8
  %9 = load i32, ptr %gep, align 4, !tbaa !5
  %10 = sext i32 %2 to i64
  %gep26 = getelementptr i32, ptr %invariant.gep25, i64 %10
  %11 = load i32, ptr %gep26, align 4, !tbaa !5
  %factor.op.mul = mul i32 %9, %11
  %12 = add i32 %2, -1
  br label %13

13:                                               ; preds = %.lr.ph, %13
  %indvars.iv = phi i64 [ %8, %.lr.ph ], [ %indvars.iv.next, %13 ]
  %.02328 = phi i32 [ 2147483647, %.lr.ph ], [ %spec.select, %13 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %14 = trunc i64 %indvars.iv.next to i32
  %15 = tail call noundef i32 @_Z3MCMPiii(ptr noundef nonnull %0, i32 noundef %1, i32 noundef %14)
  %16 = tail call noundef i32 @_Z3MCMPiii(ptr noundef nonnull %0, i32 noundef %14, i32 noundef %2)
  %17 = add nsw i32 %16, %15
  %18 = getelementptr inbounds i32, ptr %0, i64 %indvars.iv
  %19 = load i32, ptr %18, align 4, !tbaa !5
  %.reass = mul i32 %19, %factor.op.mul
  %20 = add nsw i32 %17, %.reass
  %spec.select = tail call i32 @llvm.smin.i32(i32 %20, i32 %.02328)
  %exitcond.not = icmp eq i32 %12, %14
  br i1 %exitcond.not, label %.loopexit, label %13, !llvm.loop !9

.loopexit:                                        ; preds = %13, %.preheader, %3
  %.0 = phi i32 [ 0, %3 ], [ 2147483647, %.preheader ], [ %spec.select, %13 ]
  ret i32 %.0
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.abs.i32(i32, i1 immarg) #1

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smin.i32(i32, i32) #2

attributes #0 = { mustprogress nofree nosync nounwind willreturn memory(argmem: read) 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 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { 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 = !{!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"}


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