; 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: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @r8vec_amax_index(i32 noundef %0, ptr noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca double, align 8
  %6 = alloca i32, align 4
  %7 = 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 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %8 = load i32, ptr %3, align 4, !tbaa !5
  %9 = icmp sle i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 -1, ptr %6, align 4, !tbaa !5
  br label %44

11:                                               ; preds = %2
  store i32 1, ptr %6, align 4, !tbaa !5
  %12 = load ptr, ptr %4, align 8, !tbaa !9
  %13 = getelementptr inbounds double, ptr %12, i64 0
  %14 = load double, ptr %13, align 8, !tbaa !11
  %15 = call double @llvm.fabs.f64(double %14)
  store double %15, ptr %5, align 8, !tbaa !11
  store i32 2, ptr %7, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %40, %11
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = load i32, ptr %3, align 4, !tbaa !5
  %19 = icmp sle i32 %17, %18
  br i1 %19, label %20, label %43

20:                                               ; preds = %16
  %21 = load double, ptr %5, align 8, !tbaa !11
  %22 = load ptr, ptr %4, align 8, !tbaa !9
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = sub nsw i32 %23, 1
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds double, ptr %22, i64 %25
  %27 = load double, ptr %26, align 8, !tbaa !11
  %28 = call double @llvm.fabs.f64(double %27)
  %29 = fcmp olt double %21, %28
  br i1 %29, label %30, label %39

30:                                               ; preds = %20
  %31 = load i32, ptr %7, align 4, !tbaa !5
  store i32 %31, ptr %6, align 4, !tbaa !5
  %32 = load ptr, ptr %4, align 8, !tbaa !9
  %33 = load i32, ptr %7, align 4, !tbaa !5
  %34 = sub nsw i32 %33, 1
  %35 = sext i32 %34 to i64
  %36 = getelementptr inbounds double, ptr %32, i64 %35
  %37 = load double, ptr %36, align 8, !tbaa !11
  %38 = call double @llvm.fabs.f64(double %37)
  store double %38, ptr %5, align 8, !tbaa !11
  br label %39

39:                                               ; preds = %30, %20
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %7, align 4, !tbaa !5
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %7, align 4, !tbaa !5
  br label %16, !llvm.loop !13

43:                                               ; preds = %16
  br label %44

44:                                               ; preds = %43, %10
  %45 = load i32, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  ret i32 %45
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { 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 #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 = !{!"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: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #0

; Function Attrs: nofree norecurse nosync nounwind memory(argmem: read) uwtable
define dso_local i32 @r8vec_amax_index(i32 noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #1 {
  %3 = icmp slt i32 %0, 1
  br i1 %3, label %.loopexit, label %4

4:                                                ; preds = %2
  %invariant.gep = getelementptr i8, ptr %1, i64 -8
  %.not16 = icmp eq i32 %0, 1
  br i1 %.not16, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %4
  %5 = load double, ptr %1, align 8, !tbaa !5
  %6 = tail call double @llvm.fabs.f64(double %5)
  %7 = add nuw i32 %0, 1
  %wide.trip.count = zext i32 %7 to i64
  %xtraiter = and i64 %wide.trip.count, 1
  %8 = icmp eq i32 %7, 3
  br i1 %8, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %9 = and i64 %wide.trip.count, 4294967294
  %10 = add nsw i64 %9, -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 ]
  %.01118 = phi i32 [ 1, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %.01217 = phi double [ %6, %.lr.ph.preheader.new ], [ %.113.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %gep = getelementptr double, ptr %invariant.gep, i64 %indvars.iv
  %11 = load double, ptr %gep, align 8, !tbaa !5
  %12 = tail call double @llvm.fabs.f64(double %11)
  %13 = fcmp olt double %.01217, %12
  %.113 = select i1 %13, double %12, double %.01217
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  %.1 = select i1 %13, i32 %14, i32 %.01118
  %gep.1 = getelementptr double, ptr %1, i64 %indvars.iv
  %15 = load double, ptr %gep.1, align 8, !tbaa !5
  %16 = tail call double @llvm.fabs.f64(double %15)
  %17 = fcmp olt double %.113, %16
  %.113.1 = select i1 %17, double %16, double %.113
  %18 = trunc i64 %indvars.iv to i32
  %19 = or disjoint i32 %18, 1
  %.1.1 = select i1 %17, i32 %19, 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, %10
  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 ]
  %.01118.unr = phi i32 [ 1, %.lr.ph.preheader ], [ %.1.1, %.lr.ph ]
  %.01217.unr = phi double [ %6, %.lr.ph.preheader ], [ %.113.1, %.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
  %gep.epil = getelementptr double, ptr %invariant.gep, i64 %indvars.iv.unr
  %20 = load double, ptr %gep.epil, align 8, !tbaa !5
  %21 = tail call double @llvm.fabs.f64(double %20)
  %22 = fcmp olt double %.01217.unr, %21
  %23 = trunc nuw nsw i64 %indvars.iv.unr to i32
  %.1.epil = select i1 %22, i32 %23, i32 %.01118.unr
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph.epil, %.loopexit.loopexit.unr-lcssa, %4, %2
  %.2 = phi i32 [ -1, %2 ], [ 1, %4 ], [ %.1.lcssa.ph, %.loopexit.loopexit.unr-lcssa ], [ %.1.epil, %.lr.ph.epil ]
  ret i32 %.2
}

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