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      1 ; RUN: llc < %s -mtriple=aarch64-apple-ios | FileCheck %s
      2 ; RUN: llc < %s -mtriple=aarch64-apple-ios -enable-shrink-wrap=true | FileCheck %s
      3 ; Shrink wrapping currently does not kick in because we have a TLS CALL
      4 ; in the entry block and it will clobber the link register.
      5 
      6 ; RUN: llc < %s -mtriple=aarch64-apple-ios -O0 | FileCheck --check-prefix=CHECK-O0 %s
      7 
      8 %struct.S = type { i8 }
      9 
     10 @sg = internal thread_local global %struct.S zeroinitializer, align 1
     11 @__dso_handle = external global i8
     12 @__tls_guard = internal thread_local unnamed_addr global i1 false
     13 @sum1 = internal thread_local global i32 0, align 4
     14 
     15 declare %struct.S* @_ZN1SC1Ev(%struct.S* returned)
     16 declare %struct.S* @_ZN1SD1Ev(%struct.S* returned)
     17 declare i32 @_tlv_atexit(void (i8*)*, i8*, i8*)
     18 
     19 define cxx_fast_tlscc nonnull %struct.S* @_ZTW2sg() nounwind {
     20   %.b.i = load i1, i1* @__tls_guard, align 1
     21   br i1 %.b.i, label %__tls_init.exit, label %init.i
     22 
     23 init.i:
     24   store i1 true, i1* @__tls_guard, align 1
     25   %call.i.i = tail call %struct.S* @_ZN1SC1Ev(%struct.S* nonnull @sg)
     26   %1 = tail call i32 @_tlv_atexit(void (i8*)* nonnull bitcast (%struct.S* (%struct.S*)* @_ZN1SD1Ev to void (i8*)*), i8* nonnull getelementptr inbounds (%struct.S, %struct.S* @sg, i64 0, i32 0), i8* nonnull @__dso_handle)
     27   br label %__tls_init.exit
     28 
     29 __tls_init.exit:
     30   ret %struct.S* @sg
     31 }
     32 
     33 ; CHECK-LABEL: _ZTW2sg
     34 ; CHECK-NOT: stp d31, d30
     35 ; CHECK-NOT: stp d29, d28
     36 ; CHECK-NOT: stp d27, d26
     37 ; CHECK-NOT: stp d25, d24
     38 ; CHECK-NOT: stp d23, d22
     39 ; CHECK-NOT: stp d21, d20
     40 ; CHECK-NOT: stp d19, d18
     41 ; CHECK-NOT: stp d17, d16
     42 ; CHECK-NOT: stp d7, d6
     43 ; CHECK-NOT: stp d5, d4
     44 ; CHECK-NOT: stp d3, d2
     45 ; CHECK-NOT: stp d1, d0
     46 ; CHECK-NOT: stp x20, x19
     47 ; FIXME: The splitting logic in the register allocator fails to split along
     48 ;        control flow here, we used to get this right by accident before...
     49 ; CHECK-NOTXX: stp x14, x13
     50 ; CHECK-NOT: stp x12, x11
     51 ; CHECK-NOT: stp x10, x9
     52 ; CHECK-NOT: stp x8, x7
     53 ; CHECK-NOT: stp x6, x5
     54 ; CHECK-NOT: stp x4, x3
     55 ; CHECK-NOT: stp x2, x1
     56 ; CHECK: blr
     57 ; CHECK: tbnz w{{.*}}, #0, [[BB_end:.?LBB0_[0-9]+]]
     58 ; CHECK: blr
     59 ; CHECK: tlv_atexit
     60 ; CHECK: [[BB_end]]:
     61 ; CHECK: blr
     62 ; CHECK-NOT: ldp x2, x1
     63 ; CHECK-NOT: ldp x4, x3
     64 ; CHECK-NOT: ldp x6, x5
     65 ; CHECK-NOT: ldp x8, x7
     66 ; CHECK-NOT: ldp x10, x9
     67 ; CHECK-NOT: ldp x12, x11
     68 ; CHECK-NOTXX: ldp x14, x13
     69 ; CHECK-NOT: ldp x20, x19
     70 ; CHECK-NOT: ldp d1, d0
     71 ; CHECK-NOT: ldp d3, d2
     72 ; CHECK-NOT: ldp d5, d4
     73 ; CHECK-NOT: ldp d7, d6
     74 ; CHECK-NOT: ldp d17, d16
     75 ; CHECK-NOT: ldp d19, d18
     76 ; CHECK-NOT: ldp d21, d20
     77 ; CHECK-NOT: ldp d23, d22
     78 ; CHECK-NOT: ldp d25, d24
     79 ; CHECK-NOT: ldp d27, d26
     80 ; CHECK-NOT: ldp d29, d28
     81 ; CHECK-NOT: ldp d31, d30
     82 
     83 ; CHECK-O0-LABEL: _ZTW2sg
     84 ; CHECK-O0: stp d31, d30
     85 ; CHECK-O0: stp d29, d28
     86 ; CHECK-O0: stp d27, d26
     87 ; CHECK-O0: stp d25, d24
     88 ; CHECK-O0: stp d23, d22
     89 ; CHECK-O0: stp d21, d20
     90 ; CHECK-O0: stp d19, d18
     91 ; CHECK-O0: stp d17, d16
     92 ; CHECK-O0: stp d7, d6
     93 ; CHECK-O0: stp d5, d4
     94 ; CHECK-O0: stp d3, d2
     95 ; CHECK-O0: stp d1, d0
     96 ; CHECK-O0: stp x14, x13
     97 ; CHECK-O0: stp x12, x11
     98 ; CHECK-O0: stp x10, x9
     99 ; CHECK-O0: stp x8, x7
    100 ; CHECK-O0: stp x6, x5
    101 ; CHECK-O0: stp x4, x3
    102 ; CHECK-O0: stp x2, x1
    103 ; CHECK-O0: blr
    104 ; CHECK-O0: tbnz w{{.*}}, #0, [[BB_end:.?LBB0_[0-9]+]]
    105 ; CHECK-O0: blr
    106 ; CHECK-O0: tlv_atexit
    107 ; CHECK-O0: [[BB_end]]:
    108 ; CHECK-O0: blr
    109 ; CHECK-O0: ldp x2, x1
    110 ; CHECK-O0: ldp x4, x3
    111 ; CHECK-O0: ldp x6, x5
    112 ; CHECK-O0: ldp x8, x7
    113 ; CHECK-O0: ldp x10, x9
    114 ; CHECK-O0: ldp x12, x11
    115 ; CHECK-O0: ldp x14, x13
    116 ; CHECK-O0: ldp d1, d0
    117 ; CHECK-O0: ldp d3, d2
    118 ; CHECK-O0: ldp d5, d4
    119 ; CHECK-O0: ldp d7, d6
    120 ; CHECK-O0: ldp d17, d16
    121 ; CHECK-O0: ldp d19, d18
    122 ; CHECK-O0: ldp d21, d20
    123 ; CHECK-O0: ldp d23, d22
    124 ; CHECK-O0: ldp d25, d24
    125 ; CHECK-O0: ldp d27, d26
    126 ; CHECK-O0: ldp d29, d28
    127 ; CHECK-O0: ldp d31, d30
    128 
    129 ; CHECK-LABEL: _ZTW4sum1
    130 ; CHECK-NOT: stp d31, d30
    131 ; CHECK-NOT: stp d29, d28
    132 ; CHECK-NOT: stp d27, d26
    133 ; CHECK-NOT: stp d25, d24
    134 ; CHECK-NOT: stp d23, d22
    135 ; CHECK-NOT: stp d21, d20
    136 ; CHECK-NOT: stp d19, d18
    137 ; CHECK-NOT: stp d17, d16
    138 ; CHECK-NOT: stp d7, d6
    139 ; CHECK-NOT: stp d5, d4
    140 ; CHECK-NOT: stp d3, d2
    141 ; CHECK-NOT: stp d1, d0
    142 ; CHECK-NOT: stp x20, x19
    143 ; CHECK-NOT: stp x14, x13
    144 ; CHECK-NOT: stp x12, x11
    145 ; CHECK-NOT: stp x10, x9
    146 ; CHECK-NOT: stp x8, x7
    147 ; CHECK-NOT: stp x6, x5
    148 ; CHECK-NOT: stp x4, x3
    149 ; CHECK-NOT: stp x2, x1
    150 ; CHECK: blr
    151 
    152 ; CHECK-O0-LABEL: _ZTW4sum1
    153 ; CHECK-O0-NOT: vstr
    154 ; CHECK-O0-NOT: vldr
    155 define cxx_fast_tlscc nonnull i32* @_ZTW4sum1() nounwind {
    156   ret i32* @sum1
    157 }
    158 
    159 ; Make sure at O0, we don't generate spilling/reloading of the CSRs.
    160 ; CHECK-O0-LABEL: tls_test2
    161 ; CHECK-O0-NOT: stp d31, d30
    162 ; CHECK-O0-NOT: stp d29, d28
    163 ; CHECK-O0-NOT: stp d27, d26
    164 ; CHECK-O0-NOT: stp d25, d24
    165 ; CHECK-O0-NOT: stp d23, d22
    166 ; CHECK-O0-NOT: stp d21, d20
    167 ; CHECK-O0-NOT: stp d19, d18
    168 ; CHECK-O0-NOT: stp d17, d16
    169 ; CHECK-O0-NOT: stp d7, d6
    170 ; CHECK-O0-NOT: stp d5, d4
    171 ; CHECK-O0-NOT: stp d3, d2
    172 ; CHECK-O0-NOT: stp d1, d0
    173 ; CHECK-O0-NOT: stp x20, x19
    174 ; CHECK-O0-NOT: stp x14, x13
    175 ; CHECK-O0-NOT: stp x12, x11
    176 ; CHECK-O0-NOT: stp x10, x9
    177 ; CHECK-O0-NOT: stp x8, x7
    178 ; CHECK-O0-NOT: stp x6, x5
    179 ; CHECK-O0-NOT: stp x4, x3
    180 ; CHECK-O0-NOT: stp x2, x1
    181 ; CHECK-O0: bl {{.*}}tls_helper
    182 ; CHECK-O0-NOT: ldp x2, x1
    183 ; CHECK-O0-NOT: ldp x4, x3
    184 ; CHECK-O0-NOT: ldp x6, x5
    185 ; CHECK-O0-NOT: ldp x8, x7
    186 ; CHECK-O0-NOT: ldp x10, x9
    187 ; CHECK-O0-NOT: ldp x12, x11
    188 ; CHECK-O0-NOT: ldp x14, x13
    189 ; CHECK-O0-NOT: ldp x20, x19
    190 ; CHECK-O0-NOT: ldp d1, d0
    191 ; CHECK-O0-NOT: ldp d3, d2
    192 ; CHECK-O0-NOT: ldp d5, d4
    193 ; CHECK-O0-NOT: ldp d7, d6
    194 ; CHECK-O0-NOT: ldp d17, d16
    195 ; CHECK-O0-NOT: ldp d19, d18
    196 ; CHECK-O0-NOT: ldp d21, d20
    197 ; CHECK-O0-NOT: ldp d23, d22
    198 ; CHECK-O0-NOT: ldp d25, d24
    199 ; CHECK-O0-NOT: ldp d27, d26
    200 ; CHECK-O0-NOT: ldp d29, d28
    201 ; CHECK-O0-NOT: ldp d31, d30
    202 ; CHECK-O0: ret
    203 %class.C = type { i32 }
    204 @tC = internal thread_local global %class.C zeroinitializer, align 4
    205 declare cxx_fast_tlscc void @tls_helper()
    206 define cxx_fast_tlscc %class.C* @tls_test2() #1 {
    207   call cxx_fast_tlscc void @tls_helper()
    208   ret %class.C* @tC
    209 }
    210 
    211 ; Make sure we do not allow tail call when caller and callee have different
    212 ; calling conventions.
    213 declare %class.C* @_ZN1CD1Ev(%class.C* readnone returned %this)
    214 ; CHECK-LABEL: tls_test
    215 ; CHECK: bl __tlv_atexit
    216 define cxx_fast_tlscc void @__tls_test() {
    217 entry:
    218   store i32 0, i32* getelementptr inbounds (%class.C, %class.C* @tC, i64 0, i32 0), align 4
    219   %0 = tail call i32 @_tlv_atexit(void (i8*)* bitcast (%class.C* (%class.C*)* @_ZN1CD1Ev to void (i8*)*), i8* bitcast (%class.C* @tC to i8*), i8* nonnull @__dso_handle) #1
    220   ret void
    221 }
    222 
    223 attributes #0 = { nounwind "no-frame-pointer-elim"="true" }
    224 attributes #1 = { nounwind }
    225