; LLVM IR from QiaoLiuHit/LSOTB-TIR :: vlfeat-0.9.19/vl/mathop_sse2.ll (vl_distance_l1_sse2_d)

; 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: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_setzero_pd() #1

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_add_pd(<2 x double> noundef, <2 x double> noundef) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_loadu_pd(ptr noundef) #1

; Function Attrs: inlinehint nounwind uwtable
declare hidden double @_vl_vhsum_sse2_d(<2 x double> noundef) #2

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_sub_pd(<2 x double> noundef, <2 x double> noundef) #1

; Function Attrs: nounwind uwtable
define dso_local double @_vl_distance_l1_sse2_d(i64 noundef %0, ptr noundef %1, ptr noundef %2) #3 {
  %4 = alloca i64, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca double, align 8
  %10 = alloca <2 x double>, align 16
  %11 = alloca <2 x double>, align 16
  %12 = alloca i32, align 4
  %13 = alloca <2 x double>, align 16
  %14 = alloca <2 x double>, align 16
  %15 = alloca <2 x double>, align 16
  %16 = alloca <2 x double>, align 16
  %17 = alloca <2 x double>, align 16
  %18 = alloca <2 x double>, align 16
  %19 = alloca double, align 8
  %20 = alloca double, align 8
  %21 = alloca double, align 8
  store i64 %0, ptr %4, align 8, !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 8, ptr %7) #4
  %22 = load ptr, ptr %5, align 8, !tbaa !9
  %23 = load i64, ptr %4, align 8, !tbaa !5
  %24 = getelementptr inbounds double, ptr %22, i64 %23
  store ptr %24, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #4
  %25 = load ptr, ptr %5, align 8, !tbaa !9
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = getelementptr inbounds double, ptr %25, i64 %26
  %28 = getelementptr inbounds double, ptr %27, i64 -2
  store ptr %28, ptr %8, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.start.p0(i64 16, ptr %10) #4
  %29 = call <2 x double> @_mm_setzero_pd()
  store <2 x double> %29, ptr %10, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %11) #4
  %30 = call <2 x double> @_mm_set1_pd(double noundef -0.000000e+00)
  store <2 x double> %30, ptr %11, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 4, ptr %12) #4
  %31 = load ptr, ptr %5, align 8, !tbaa !9
  %32 = ptrtoint ptr %31 to i64
  %33 = and i64 %32, 15
  %34 = icmp ne i64 %33, 0
  %35 = xor i1 %34, true
  %36 = zext i1 %35 to i32
  %37 = load ptr, ptr %6, align 8, !tbaa !9
  %38 = ptrtoint ptr %37 to i64
  %39 = and i64 %38, 15
  %40 = icmp ne i64 %39, 0
  %41 = xor i1 %40, true
  %42 = zext i1 %41 to i32
  %43 = and i32 %36, %42
  store i32 %43, ptr %12, align 4, !tbaa !12
  %44 = load i32, ptr %12, align 4, !tbaa !12
  %45 = icmp ne i32 %44, 0
  br i1 %45, label %46, label %69

46:                                               ; preds = %3
  br label %47

47:                                               ; preds = %51, %46
  %48 = load ptr, ptr %5, align 8, !tbaa !9
  %49 = load ptr, ptr %8, align 8, !tbaa !9
  %50 = icmp ult ptr %48, %49
  br i1 %50, label %51, label %68

51:                                               ; preds = %47
  call void @llvm.lifetime.start.p0(i64 16, ptr %13) #4
  %52 = load ptr, ptr %5, align 8, !tbaa !9
  %53 = load <2 x double>, ptr %52, align 16, !tbaa !11
  store <2 x double> %53, ptr %13, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %14) #4
  %54 = load ptr, ptr %6, align 8, !tbaa !9
  %55 = load <2 x double>, ptr %54, align 16, !tbaa !11
  store <2 x double> %55, ptr %14, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %15) #4
  %56 = load <2 x double>, ptr %13, align 16, !tbaa !11
  %57 = load <2 x double>, ptr %14, align 16, !tbaa !11
  %58 = call <2 x double> @_mm_sub_pd(<2 x double> noundef %56, <2 x double> noundef %57)
  store <2 x double> %58, ptr %15, align 16, !tbaa !11
  %59 = load <2 x double>, ptr %10, align 16, !tbaa !11
  %60 = load <2 x double>, ptr %11, align 16, !tbaa !11
  %61 = load <2 x double>, ptr %15, align 16, !tbaa !11
  %62 = call <2 x double> @_mm_andnot_pd(<2 x double> noundef %60, <2 x double> noundef %61)
  %63 = call <2 x double> @_mm_add_pd(<2 x double> noundef %59, <2 x double> noundef %62)
  store <2 x double> %63, ptr %10, align 16, !tbaa !11
  %64 = load ptr, ptr %5, align 8, !tbaa !9
  %65 = getelementptr inbounds double, ptr %64, i64 2
  store ptr %65, ptr %5, align 8, !tbaa !9
  %66 = load ptr, ptr %6, align 8, !tbaa !9
  %67 = getelementptr inbounds double, ptr %66, i64 2
  store ptr %67, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 16, ptr %15) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %14) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %13) #4
  br label %47, !llvm.loop !14

68:                                               ; preds = %47
  br label %92

69:                                               ; preds = %3
  br label %70

70:                                               ; preds = %74, %69
  %71 = load ptr, ptr %5, align 8, !tbaa !9
  %72 = load ptr, ptr %8, align 8, !tbaa !9
  %73 = icmp ult ptr %71, %72
  br i1 %73, label %74, label %91

74:                                               ; preds = %70
  call void @llvm.lifetime.start.p0(i64 16, ptr %16) #4
  %75 = load ptr, ptr %5, align 8, !tbaa !9
  %76 = call <2 x double> @_mm_loadu_pd(ptr noundef %75)
  store <2 x double> %76, ptr %16, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %17) #4
  %77 = load ptr, ptr %6, align 8, !tbaa !9
  %78 = call <2 x double> @_mm_loadu_pd(ptr noundef %77)
  store <2 x double> %78, ptr %17, align 16, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %18) #4
  %79 = load <2 x double>, ptr %16, align 16, !tbaa !11
  %80 = load <2 x double>, ptr %17, align 16, !tbaa !11
  %81 = call <2 x double> @_mm_sub_pd(<2 x double> noundef %79, <2 x double> noundef %80)
  store <2 x double> %81, ptr %18, align 16, !tbaa !11
  %82 = load <2 x double>, ptr %10, align 16, !tbaa !11
  %83 = load <2 x double>, ptr %11, align 16, !tbaa !11
  %84 = load <2 x double>, ptr %18, align 16, !tbaa !11
  %85 = call <2 x double> @_mm_andnot_pd(<2 x double> noundef %83, <2 x double> noundef %84)
  %86 = call <2 x double> @_mm_add_pd(<2 x double> noundef %82, <2 x double> noundef %85)
  store <2 x double> %86, ptr %10, align 16, !tbaa !11
  %87 = load ptr, ptr %5, align 8, !tbaa !9
  %88 = getelementptr inbounds double, ptr %87, i64 2
  store ptr %88, ptr %5, align 8, !tbaa !9
  %89 = load ptr, ptr %6, align 8, !tbaa !9
  %90 = getelementptr inbounds double, ptr %89, i64 2
  store ptr %90, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 16, ptr %18) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %17) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %16) #4
  br label %70, !llvm.loop !16

91:                                               ; preds = %70
  br label %92

92:                                               ; preds = %91, %68
  %93 = load <2 x double>, ptr %10, align 16, !tbaa !11
  %94 = call double @_vl_vhsum_sse2_d(<2 x double> noundef %93)
  store double %94, ptr %9, align 8, !tbaa !17
  br label %95

95:                                               ; preds = %118, %92
  %96 = load ptr, ptr %5, align 8, !tbaa !9
  %97 = load ptr, ptr %7, align 8, !tbaa !9
  %98 = icmp ult ptr %96, %97
  br i1 %98, label %99, label %122

99:                                               ; preds = %95
  call void @llvm.lifetime.start.p0(i64 8, ptr %19) #4
  %100 = load ptr, ptr %5, align 8, !tbaa !9
  %101 = getelementptr inbounds double, ptr %100, i32 1
  store ptr %101, ptr %5, align 8, !tbaa !9
  %102 = load double, ptr %100, align 8, !tbaa !17
  store double %102, ptr %19, align 8, !tbaa !17
  call void @llvm.lifetime.start.p0(i64 8, ptr %20) #4
  %103 = load ptr, ptr %6, align 8, !tbaa !9
  %104 = getelementptr inbounds double, ptr %103, i32 1
  store ptr %104, ptr %6, align 8, !tbaa !9
  %105 = load double, ptr %103, align 8, !tbaa !17
  store double %105, ptr %20, align 8, !tbaa !17
  call void @llvm.lifetime.start.p0(i64 8, ptr %21) #4
  %106 = load double, ptr %19, align 8, !tbaa !17
  %107 = load double, ptr %20, align 8, !tbaa !17
  %108 = fsub double %106, %107
  store double %108, ptr %21, align 8, !tbaa !17
  %109 = load double, ptr %21, align 8, !tbaa !17
  %110 = load double, ptr %21, align 8, !tbaa !17
  %111 = fneg double %110
  %112 = fcmp ogt double %109, %111
  br i1 %112, label %113, label %115

113:                                              ; preds = %99
  %114 = load double, ptr %21, align 8, !tbaa !17
  br label %118

115:                                              ; preds = %99
  %116 = load double, ptr %21, align 8, !tbaa !17
  %117 = fneg double %116
  br label %118

118:                                              ; preds = %115, %113
  %119 = phi double [ %114, %113 ], [ %117, %115 ]
  %120 = load double, ptr %9, align 8, !tbaa !17
  %121 = fadd double %120, %119
  store double %121, ptr %9, align 8, !tbaa !17
  call void @llvm.lifetime.end.p0(i64 8, ptr %21) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %20) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %19) #4
  br label %95, !llvm.loop !19

122:                                              ; preds = %95
  %123 = load double, ptr %9, align 8, !tbaa !17
  call void @llvm.lifetime.end.p0(i64 4, ptr %12) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %11) #4
  call void @llvm.lifetime.end.p0(i64 16, ptr %10) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #4
  ret double %123
}

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_set1_pd(double noundef) #1

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_andnot_pd(<2 x double> noundef, <2 x double> noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { alwaysinline nounwind uwtable "min-legal-vector-width"="128" "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 = { inlinehint nounwind uwtable "min-legal-vector-width"="128" "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 uwtable "min-legal-vector-width"="128" "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 #4 = { 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 = !{!"long long", !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 = !{!7, !7, i64 0}
!12 = !{!13, !13, i64 0}
!13 = !{!"int", !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}
!16 = distinct !{!16, !15}
!17 = !{!18, !18, i64 0}
!18 = !{!"double", !7, i64 0}
!19 = distinct !{!19, !15}


; 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: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_setzero_pd() local_unnamed_addr #0

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_add_pd(<2 x double> noundef, <2 x double> noundef) local_unnamed_addr #0

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_loadu_pd(ptr noundef) local_unnamed_addr #0

; Function Attrs: inlinehint nounwind uwtable
declare hidden double @_vl_vhsum_sse2_d(<2 x double> noundef) local_unnamed_addr #1

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_sub_pd(<2 x double> noundef, <2 x double> noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local double @_vl_distance_l1_sse2_d(i64 noundef %0, ptr noundef %1, ptr noundef %2) local_unnamed_addr #2 {
  %4 = getelementptr inbounds double, ptr %1, i64 %0
  %5 = getelementptr inbounds i8, ptr %4, i64 -16
  %6 = tail call <2 x double> @_mm_setzero_pd()
  %7 = tail call <2 x double> @_mm_set1_pd(double noundef -0.000000e+00)
  %8 = ptrtoint ptr %1 to i64
  %9 = ptrtoint ptr %2 to i64
  %10 = or i64 %9, %8
  %11 = and i64 %10, 15
  %12 = icmp eq i64 %11, 0
  %13 = icmp ugt ptr %5, %1
  br i1 %12, label %.preheader, label %.preheader50

.preheader50:                                     ; preds = %3
  br i1 %13, label %.lr.ph, label %.loopexit

.preheader:                                       ; preds = %3
  br i1 %13, label %.lr.ph60, label %.loopexit

.lr.ph60:                                         ; preds = %.preheader, %.lr.ph60
  %.059 = phi ptr [ %19, %.lr.ph60 ], [ %1, %.preheader ]
  %.04158 = phi ptr [ %20, %.lr.ph60 ], [ %2, %.preheader ]
  %.04657 = phi <2 x double> [ %18, %.lr.ph60 ], [ %6, %.preheader ]
  %14 = load <2 x double>, ptr %.059, align 16, !tbaa !5
  %15 = load <2 x double>, ptr %.04158, align 16, !tbaa !5
  %16 = tail call <2 x double> @_mm_sub_pd(<2 x double> noundef %14, <2 x double> noundef %15)
  %17 = tail call <2 x double> @_mm_andnot_pd(<2 x double> noundef %7, <2 x double> noundef %16)
  %18 = tail call <2 x double> @_mm_add_pd(<2 x double> noundef %.04657, <2 x double> noundef %17)
  %19 = getelementptr inbounds i8, ptr %.059, i64 16
  %20 = getelementptr inbounds i8, ptr %.04158, i64 16
  %21 = icmp ult ptr %19, %5
  br i1 %21, label %.lr.ph60, label %.loopexit, !llvm.loop !8

.lr.ph:                                           ; preds = %.preheader50, %.lr.ph
  %.154 = phi ptr [ %27, %.lr.ph ], [ %1, %.preheader50 ]
  %.14253 = phi ptr [ %28, %.lr.ph ], [ %2, %.preheader50 ]
  %.14752 = phi <2 x double> [ %26, %.lr.ph ], [ %6, %.preheader50 ]
  %22 = tail call <2 x double> @_mm_loadu_pd(ptr noundef %.154)
  %23 = tail call <2 x double> @_mm_loadu_pd(ptr noundef %.14253)
  %24 = tail call <2 x double> @_mm_sub_pd(<2 x double> noundef %22, <2 x double> noundef %23)
  %25 = tail call <2 x double> @_mm_andnot_pd(<2 x double> noundef %7, <2 x double> noundef %24)
  %26 = tail call <2 x double> @_mm_add_pd(<2 x double> noundef %.14752, <2 x double> noundef %25)
  %27 = getelementptr inbounds i8, ptr %.154, i64 16
  %28 = getelementptr inbounds i8, ptr %.14253, i64 16
  %29 = icmp ult ptr %27, %5
  br i1 %29, label %.lr.ph, label %.loopexit, !llvm.loop !10

.loopexit:                                        ; preds = %.lr.ph, %.lr.ph60, %.preheader50, %.preheader
  %.248 = phi <2 x double> [ %6, %.preheader ], [ %6, %.preheader50 ], [ %18, %.lr.ph60 ], [ %26, %.lr.ph ]
  %.243 = phi ptr [ %2, %.preheader ], [ %2, %.preheader50 ], [ %20, %.lr.ph60 ], [ %28, %.lr.ph ]
  %.2 = phi ptr [ %1, %.preheader ], [ %1, %.preheader50 ], [ %19, %.lr.ph60 ], [ %27, %.lr.ph ]
  %30 = tail call double @_vl_vhsum_sse2_d(<2 x double> noundef %.248)
  %31 = icmp ult ptr %.2, %4
  br i1 %31, label %.lr.ph67, label %._crit_edge

.lr.ph67:                                         ; preds = %.loopexit, %.lr.ph67
  %.366 = phi ptr [ %32, %.lr.ph67 ], [ %.2, %.loopexit ]
  %.34465 = phi ptr [ %34, %.lr.ph67 ], [ %.243, %.loopexit ]
  %.04564 = phi double [ %40, %.lr.ph67 ], [ %30, %.loopexit ]
  %32 = getelementptr inbounds i8, ptr %.366, i64 8
  %33 = load double, ptr %.366, align 8, !tbaa !11
  %34 = getelementptr inbounds i8, ptr %.34465, i64 8
  %35 = load double, ptr %.34465, align 8, !tbaa !11
  %36 = fsub double %33, %35
  %37 = fneg double %36
  %38 = fcmp ogt double %36, 0.000000e+00
  %39 = select i1 %38, double %36, double %37
  %40 = fadd double %.04564, %39
  %41 = icmp ult ptr %32, %4
  br i1 %41, label %.lr.ph67, label %._crit_edge, !llvm.loop !13

._crit_edge:                                      ; preds = %.lr.ph67, %.loopexit
  %.045.lcssa = phi double [ %30, %.loopexit ], [ %40, %.lr.ph67 ]
  ret double %.045.lcssa
}

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_set1_pd(double noundef) local_unnamed_addr #0

; Function Attrs: alwaysinline nounwind uwtable
declare hidden <2 x double> @_mm_andnot_pd(<2 x double> noundef, <2 x double> noundef) local_unnamed_addr #0

attributes #0 = { alwaysinline nounwind uwtable "min-legal-vector-width"="128" "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 #1 = { inlinehint nounwind uwtable "min-legal-vector-width"="128" "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 uwtable "min-legal-vector-width"="128" "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = distinct !{!10, !9}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !6, i64 0}
!13 = distinct !{!13, !9}


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