; 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 @r8vec2_sum_max_index(i32 noundef %0, ptr noundef %1, ptr noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca double, align 8
  %9 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !9
  store ptr %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #2
  %10 = load i32, ptr %4, align 4, !tbaa !5
  %11 = icmp sle i32 %10, 0
  br i1 %11, label %12, label %13

12:                                               ; preds = %3
  store i32 -1, ptr %9, align 4, !tbaa !5
  br label %61

13:                                               ; preds = %3
  store i32 1, ptr %9, align 4, !tbaa !5
  %14 = load ptr, ptr %5, align 8, !tbaa !9
  %15 = getelementptr inbounds double, ptr %14, i64 0
  %16 = load double, ptr %15, align 8, !tbaa !11
  %17 = load ptr, ptr %6, align 8, !tbaa !9
  %18 = getelementptr inbounds double, ptr %17, i64 0
  %19 = load double, ptr %18, align 8, !tbaa !11
  %20 = fadd double %16, %19
  store double %20, ptr %8, align 8, !tbaa !11
  store i32 2, ptr %7, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %57, %13
  %22 = load i32, ptr %7, align 4, !tbaa !5
  %23 = load i32, ptr %4, align 4, !tbaa !5
  %24 = icmp sle i32 %22, %23
  br i1 %24, label %25, label %60

25:                                               ; preds = %21
  %26 = load double, ptr %8, align 8, !tbaa !11
  %27 = load ptr, ptr %5, align 8, !tbaa !9
  %28 = load i32, ptr %7, align 4, !tbaa !5
  %29 = sub nsw i32 %28, 1
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds double, ptr %27, i64 %30
  %32 = load double, ptr %31, align 8, !tbaa !11
  %33 = load ptr, ptr %6, align 8, !tbaa !9
  %34 = load i32, ptr %7, align 4, !tbaa !5
  %35 = sub nsw i32 %34, 1
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds double, ptr %33, i64 %36
  %38 = load double, ptr %37, align 8, !tbaa !11
  %39 = fadd double %32, %38
  %40 = fcmp olt double %26, %39
  br i1 %40, label %41, label %56

41:                                               ; preds = %25
  %42 = load ptr, ptr %5, align 8, !tbaa !9
  %43 = load i32, ptr %7, align 4, !tbaa !5
  %44 = sub nsw i32 %43, 1
  %45 = sext i32 %44 to i64
  %46 = getelementptr inbounds double, ptr %42, i64 %45
  %47 = load double, ptr %46, align 8, !tbaa !11
  %48 = load ptr, ptr %6, align 8, !tbaa !9
  %49 = load i32, ptr %7, align 4, !tbaa !5
  %50 = sub nsw i32 %49, 1
  %51 = sext i32 %50 to i64
  %52 = getelementptr inbounds double, ptr %48, i64 %51
  %53 = load double, ptr %52, align 8, !tbaa !11
  %54 = fadd double %47, %53
  store double %54, ptr %8, align 8, !tbaa !11
  %55 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %55, ptr %9, align 4, !tbaa !5
  br label %56

56:                                               ; preds = %41, %25
  br label %57

57:                                               ; preds = %56
  %58 = load i32, ptr %7, align 4, !tbaa !5
  %59 = add nsw i32 %58, 1
  store i32 %59, ptr %7, align 4, !tbaa !5
  br label %21, !llvm.loop !13

60:                                               ; preds = %21
  br label %61

61:                                               ; preds = %60, %12
  %62 = load i32, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %62
}

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 @r8vec2_sum_max_index(i32 noundef %0, ptr nocapture noundef readonly %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = icmp slt i32 %0, 1
  br i1 %4, label %.loopexit, label %5

5:                                                ; preds = %3
  %.not21 = icmp eq i32 %0, 1
  br i1 %.not21, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %5
  %6 = load double, ptr %1, align 8, !tbaa !5
  %7 = load double, ptr %2, align 8, !tbaa !5
  %8 = fadd double %6, %7
  %9 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %9 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %10 = icmp eq i32 %9, 3
  br i1 %10, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %11 = and i64 %wide.trip.count, 4294967294
  %12 = add nsw i64 %11, -4
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv = phi i64 [ 2, %.lr.ph.preheader.new ], [ %indvars.iv.next.1, %.lr.ph ]
  %.024 = phi i32 [ 1, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %.01623 = phi double [ %8, %.lr.ph.preheader.new ], [ %.117.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %13 = add nsw i64 %indvars.iv, -1
  %14 = getelementptr inbounds double, ptr %1, i64 %13
  %15 = load double, ptr %14, align 8, !tbaa !5
  %16 = getelementptr inbounds double, ptr %2, i64 %13
  %17 = load double, ptr %16, align 8, !tbaa !5
  %18 = fadd double %15, %17
  %19 = fcmp olt double %.01623, %18
  %.117 = select i1 %19, double %18, double %.01623
  %20 = trunc nuw nsw i64 %indvars.iv to i32
  %.1 = select i1 %19, i32 %20, i32 %.024
  %21 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %22 = load double, ptr %21, align 8, !tbaa !5
  %23 = getelementptr inbounds double, ptr %2, i64 %indvars.iv
  %24 = load double, ptr %23, align 8, !tbaa !5
  %25 = fadd double %22, %24
  %26 = fcmp olt double %.117, %25
  %.117.1 = select i1 %26, double %25, double %.117
  %27 = trunc i64 %indvars.iv to i32
  %28 = or disjoint i32 %27, 1
  %.1.1 = select i1 %26, i32 %28, i32 %.1
  %indvars.iv.next.1 = add nuw nsw i64 %indvars.iv, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter, %12
  br i1 %niter.ncmp.1, 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 ], [ %.1.1, %.lr.ph ]
  %indvars.iv.unr = phi i64 [ 2, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %.024.unr = phi i32 [ 1, %.lr.ph.preheader ], [ %.1.1, %.lr.ph ]
  %.01623.unr = phi double [ %8, %.lr.ph.preheader ], [ %.117.1, %.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
  %29 = add nsw i64 %indvars.iv.unr, -1
  %30 = getelementptr inbounds double, ptr %1, i64 %29
  %31 = load double, ptr %30, align 8, !tbaa !5
  %32 = getelementptr inbounds double, ptr %2, i64 %29
  %33 = load double, ptr %32, align 8, !tbaa !5
  %34 = fadd double %31, %33
  %35 = fcmp olt double %.01623.unr, %34
  %36 = trunc nuw nsw i64 %indvars.iv.unr to i32
  %.1.epil = select i1 %35, i32 %36, i32 %.024.unr
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph.epil, %.loopexit.loopexit.unr-lcssa, %5, %3
  %.2 = phi i32 [ -1, %3 ], [ 1, %5 ], [ %.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"}


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