; LLVM IR from CLASS-SZ/class_sz :: class-sz/tools (r8lib)

; 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 i32 @r8vec_max_index(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp sle i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %2
  store i32 -1, ptr %6, align 4, !tbaa !5
  br label %34

10:                                               ; preds = %2
  store i32 0, ptr %6, align 4, !tbaa !5
  store i32 1, ptr %5, align 4, !tbaa !5
  br label %11

11:                                               ; preds = %30, %10
  %12 = load i32, ptr %5, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %33

15:                                               ; preds = %11
  %16 = load ptr, ptr %4, align 8, !tbaa !9
  %17 = load i32, ptr %6, align 4, !tbaa !5
  %18 = sext i32 %17 to i64
  %19 = getelementptr inbounds double, ptr %16, i64 %18
  %20 = load double, ptr %19, align 8, !tbaa !11
  %21 = load ptr, ptr %4, align 8, !tbaa !9
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds double, ptr %21, i64 %23
  %25 = load double, ptr %24, align 8, !tbaa !11
  %26 = fcmp olt double %20, %25
  br i1 %26, label %27, label %29

27:                                               ; preds = %15
  %28 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %28, ptr %6, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %27, %15
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %5, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %5, align 4, !tbaa !5
  br label %11, !llvm.loop !13

33:                                               ; preds = %11
  br label %34

34:                                               ; preds = %33, %9
  %35 = load i32, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %35
}

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 = !{!"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 = !{!12, !12, i64 0}
!12 = !{!"double", !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: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @r8vec_max_index(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = icmp slt i32 %0, 1
  br i1 %3, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %2
  %.not = icmp eq i32 %0, 1
  br i1 %.not, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %.preheader
  %wide.trip.count = zext nneg i32 %0 to i64
  %4 = add nsw i64 %wide.trip.count, -1
  %5 = add nsw i64 %wide.trip.count, -2
  %xtraiter = and i64 %4, 3
  %6 = icmp ult i64 %5, 3
  br i1 %6, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %4, -4
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next.3, %.lr.ph ]
  %.012 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.1.3, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.3, %.lr.ph ]
  %7 = sext i32 %.012 to i64
  %8 = getelementptr inbounds double, ptr %1, i64 %7
  %9 = load double, ptr %8, align 8, !tbaa !5
  %10 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %11 = load double, ptr %10, align 8, !tbaa !5
  %12 = fcmp olt double %9, %11
  %13 = trunc nuw nsw i64 %indvars.iv to i32
  %.1 = select i1 %12, i32 %13, i32 %.012
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %14 = sext i32 %.1 to i64
  %15 = getelementptr inbounds double, ptr %1, i64 %14
  %16 = load double, ptr %15, align 8, !tbaa !5
  %17 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next
  %18 = load double, ptr %17, align 8, !tbaa !5
  %19 = fcmp olt double %16, %18
  %20 = trunc nuw nsw i64 %indvars.iv.next to i32
  %.1.1 = select i1 %19, i32 %20, i32 %.1
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %21 = sext i32 %.1.1 to i64
  %22 = getelementptr inbounds double, ptr %1, i64 %21
  %23 = load double, ptr %22, align 8, !tbaa !5
  %24 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.1
  %25 = load double, ptr %24, align 8, !tbaa !5
  %26 = fcmp olt double %23, %25
  %27 = trunc nuw nsw i64 %indvars.iv.next.1 to i32
  %.1.2 = select i1 %26, i32 %27, i32 %.1.1
  %indvars.iv.next.2 = add nuw nsw i64 %indvars.iv, 3
  %28 = sext i32 %.1.2 to i64
  %29 = getelementptr inbounds double, ptr %1, i64 %28
  %30 = load double, ptr %29, align 8, !tbaa !5
  %31 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next.2
  %32 = load double, ptr %31, align 8, !tbaa !5
  %33 = fcmp olt double %30, %32
  %34 = trunc nuw nsw i64 %indvars.iv.next.2 to i32
  %.1.3 = select i1 %33, i32 %34, i32 %.1.2
  %indvars.iv.next.3 = add nuw nsw i64 %indvars.iv, 4
  %niter.next.3 = add i64 %niter, 4
  %niter.ncmp.3 = icmp eq i64 %niter.next.3, %unroll_iter
  br i1 %niter.ncmp.3, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !9

.loopexit.loopexit.unr-lcssa:                     ; preds = %.lr.ph, %.lr.ph.preheader
  %.1.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %.1.3, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.3, %.lr.ph ]
  %.012.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %.1.3, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %.loopexit, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %.loopexit.loopexit.unr-lcssa, %.lr.ph.epil
  %indvars.iv.epil = phi i64 [ %indvars.iv.next.epil, %.lr.ph.epil ], [ %indvars.iv.unr, %.loopexit.loopexit.unr-lcssa ]
  %.012.epil = phi i32 [ %.1.epil, %.lr.ph.epil ], [ %.012.unr, %.loopexit.loopexit.unr-lcssa ]
  %epil.iter = phi i64 [ %epil.iter.next, %.lr.ph.epil ], [ 0, %.loopexit.loopexit.unr-lcssa ]
  %35 = sext i32 %.012.epil to i64
  %36 = getelementptr inbounds double, ptr %1, i64 %35
  %37 = load double, ptr %36, align 8, !tbaa !5
  %38 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.epil
  %39 = load double, ptr %38, align 8, !tbaa !5
  %40 = fcmp olt double %37, %39
  %41 = trunc nuw nsw i64 %indvars.iv.epil to i32
  %.1.epil = select i1 %40, i32 %41, i32 %.012.epil
  %indvars.iv.next.epil = add nuw nsw i64 %indvars.iv.epil, 1
  %epil.iter.next = add i64 %epil.iter, 1
  %epil.iter.cmp.not = icmp eq i64 %epil.iter.next, %xtraiter
  br i1 %epil.iter.cmp.not, label %.loopexit, label %.lr.ph.epil, !llvm.loop !11

.loopexit:                                        ; preds = %.loopexit.loopexit.unr-lcssa, %.lr.ph.epil, %.preheader, %2
  %.2 = phi i32 [ -1, %2 ], [ 0, %.preheader ], [ %.1.lcssa.ph, %.loopexit.loopexit.unr-lcssa ], [ %.1.epil, %.lr.ph.epil ]
  ret i32 %.2
}

attributes #0 = { nofree norecurse nosync nounwind 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" }

!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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.unroll.disable"}


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