; LLVM IR from niuyishuai/PDCABB :: LAPACK_BLAS/LAPACK (maxloc)

; 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 i64 @dmaxloc_(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i64, align 8
  %7 = alloca i64, align 8
  %8 = alloca double, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds double, ptr %9, i32 -1
  store ptr %10, ptr %3, align 8, !tbaa !5
  store i64 1, ptr %5, align 8, !tbaa !9
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds double, ptr %11, i64 1
  %13 = load double, ptr %12, align 8, !tbaa !11
  store double %13, ptr %8, align 8, !tbaa !11
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = load i64, ptr %14, align 8, !tbaa !9
  store i64 %15, ptr %6, align 8, !tbaa !9
  store i64 2, ptr %7, align 8, !tbaa !9
  br label %16

16:                                               ; preds = %34, %2
  %17 = load i64, ptr %7, align 8, !tbaa !9
  %18 = load i64, ptr %6, align 8, !tbaa !9
  %19 = icmp sle i64 %17, %18
  br i1 %19, label %20, label %37

20:                                               ; preds = %16
  %21 = load double, ptr %8, align 8, !tbaa !11
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = load i64, ptr %7, align 8, !tbaa !9
  %24 = getelementptr inbounds double, ptr %22, i64 %23
  %25 = load double, ptr %24, align 8, !tbaa !11
  %26 = fcmp olt double %21, %25
  br i1 %26, label %27, label %33

27:                                               ; preds = %20
  %28 = load ptr, ptr %3, align 8, !tbaa !5
  %29 = load i64, ptr %7, align 8, !tbaa !9
  %30 = getelementptr inbounds double, ptr %28, i64 %29
  %31 = load double, ptr %30, align 8, !tbaa !11
  store double %31, ptr %8, align 8, !tbaa !11
  %32 = load i64, ptr %7, align 8, !tbaa !9
  store i64 %32, ptr %5, align 8, !tbaa !9
  br label %33

33:                                               ; preds = %27, %20
  br label %34

34:                                               ; preds = %33
  %35 = load i64, ptr %7, align 8, !tbaa !9
  %36 = add nsw i64 %35, 1
  store i64 %36, ptr %7, align 8, !tbaa !9
  br label %16, !llvm.loop !13

37:                                               ; preds = %16
  %38 = load i64, ptr %5, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret i64 %38
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !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 i64 @dmaxloc_(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = getelementptr inbounds i8, ptr %0, i64 -8
  %4 = load i64, ptr %1, align 8, !tbaa !5
  %.not16 = icmp slt i64 %4, 2
  br i1 %.not16, label %._crit_edge, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %2
  %5 = load double, ptr %0, align 8, !tbaa !9
  %6 = add nsw i64 %4, -1
  %xtraiter = and i64 %6, 1
  %7 = icmp eq i64 %4, 2
  br i1 %7, label %._crit_edge.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %6, -2
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %.019 = phi double [ %5, %.lr.ph.preheader.new ], [ %.1.1, %.lr.ph ]
  %.01218 = phi i64 [ 2, %.lr.ph.preheader.new ], [ %15, %.lr.ph ]
  %.01317 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %.114.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %8 = getelementptr inbounds double, ptr %3, i64 %.01218
  %9 = load double, ptr %8, align 8, !tbaa !9
  %10 = fcmp olt double %.019, %9
  %.114 = select i1 %10, i64 %.01218, i64 %.01317
  %.1 = select i1 %10, double %9, double %.019
  %11 = or disjoint i64 %.01218, 1
  %12 = getelementptr double, ptr %0, i64 %.01218
  %13 = load double, ptr %12, align 8, !tbaa !9
  %14 = fcmp olt double %.1, %13
  %.114.1 = select i1 %14, i64 %11, i64 %.114
  %.1.1 = select i1 %14, double %13, double %.1
  %15 = add nuw i64 %.01218, 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 %._crit_edge.loopexit.unr-lcssa, label %.lr.ph, !llvm.loop !11

._crit_edge.loopexit.unr-lcssa:                   ; preds = %.lr.ph, %.lr.ph.preheader
  %.114.lcssa.ph = phi i64 [ poison, %.lr.ph.preheader ], [ %.114.1, %.lr.ph ]
  %.019.unr = phi double [ %5, %.lr.ph.preheader ], [ %.1.1, %.lr.ph ]
  %.01218.unr = phi i64 [ 2, %.lr.ph.preheader ], [ %15, %.lr.ph ]
  %.01317.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %.114.1, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge.loopexit.unr-lcssa
  %16 = getelementptr inbounds double, ptr %3, i64 %.01218.unr
  %17 = load double, ptr %16, align 8, !tbaa !9
  %18 = fcmp olt double %.019.unr, %17
  %.114.epil = select i1 %18, i64 %.01218.unr, i64 %.01317.unr
  br label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph.epil, %._crit_edge.loopexit.unr-lcssa, %2
  %.013.lcssa = phi i64 [ 1, %2 ], [ %.114.lcssa.ph, %._crit_edge.loopexit.unr-lcssa ], [ %.114.epil, %.lr.ph.epil ]
  ret i64 %.013.lcssa
}

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


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