; 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_max_abs_index(i32 noundef %0, ptr noundef %1) #2 {
  %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) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %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 %36

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 = %32, %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 %35

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 = call double @llvm.fabs.f64(double %20)
  %22 = load ptr, ptr %4, align 8, !tbaa !9
  %23 = load i32, ptr %5, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds double, ptr %22, i64 %24
  %26 = load double, ptr %25, align 8, !tbaa !11
  %27 = call double @llvm.fabs.f64(double %26)
  %28 = fcmp olt double %21, %27
  br i1 %28, label %29, label %31

29:                                               ; preds = %15
  %30 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %30, ptr %6, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %29, %15
  br label %32

32:                                               ; preds = %31
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %5, align 4, !tbaa !5
  br label %11, !llvm.loop !13

35:                                               ; preds = %11
  br label %36

36:                                               ; preds = %35, %9
  %37 = load i32, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %37
}

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_max_abs_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 %.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
  %xtraiter = and i64 %4, 1
  %5 = icmp eq i32 %0, 2
  br i1 %5, label %.loopexit.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %4, -2
  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.1, %.lr.ph ]
  %.012 = phi i32 [ 0, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %6 = sext i32 %.012 to i64
  %7 = getelementptr inbounds double, ptr %1, i64 %6
  %8 = load double, ptr %7, align 8, !tbaa !5
  %9 = tail call double @llvm.fabs.f64(double %8)
  %10 = getelementptr inbounds double, ptr %1, i64 %indvars.iv
  %11 = load double, ptr %10, align 8, !tbaa !5
  %12 = tail call double @llvm.fabs.f64(double %11)
  %13 = fcmp olt double %9, %12
  %14 = trunc nuw nsw i64 %indvars.iv to i32
  %.1 = select i1 %13, i32 %14, i32 %.012
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %15 = sext i32 %.1 to i64
  %16 = getelementptr inbounds double, ptr %1, i64 %15
  %17 = load double, ptr %16, align 8, !tbaa !5
  %18 = tail call double @llvm.fabs.f64(double %17)
  %19 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.next
  %20 = load double, ptr %19, align 8, !tbaa !5
  %21 = tail call double @llvm.fabs.f64(double %20)
  %22 = fcmp olt double %18, %21
  %23 = trunc nuw nsw i64 %indvars.iv.next to i32
  %.1.1 = select i1 %22, i32 %23, 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.next.1, %unroll_iter
  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 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next.1, %.lr.ph ]
  %.012.unr = phi i32 [ 0, %.lr.ph.preheader ], [ %.1.1, %.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
  %24 = sext i32 %.012.unr to i64
  %25 = getelementptr inbounds double, ptr %1, i64 %24
  %26 = load double, ptr %25, align 8, !tbaa !5
  %27 = tail call double @llvm.fabs.f64(double %26)
  %28 = getelementptr inbounds double, ptr %1, i64 %indvars.iv.unr
  %29 = load double, ptr %28, align 8, !tbaa !5
  %30 = tail call double @llvm.fabs.f64(double %29)
  %31 = fcmp olt double %27, %30
  %32 = trunc nuw nsw i64 %indvars.iv.unr to i32
  %.1.epil = select i1 %31, i32 %32, i32 %.012.unr
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph.epil, %.loopexit.loopexit.unr-lcssa, %.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 = { 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: GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass