1 # RUN: llc -o - %s -start-after=if-converter | FileCheck %s
4 target datalayout = "E-m:e-i64:64-n32:64"
5 target triple = "powerpc64-unknown-linux-gnu"
7 %struct.rwlock_t.0.22.58.68.242.244 = type {}
9 @tasklist_lock = external global %struct.rwlock_t.0.22.58.68.242.244, align 1
11 ; Function Attrs: nounwind
12 define void @mm_update_next_owner(i8** %p1, i32* %p2) #0 {
14 %0 = load i8*, i8** %p1, align 8
15 br i1 undef, label %do.body.92, label %for.body.21
17 for.body.21: ; preds = %entry
20 do.body.92: ; preds = %entry
21 %usage = getelementptr inbounds i8, i8* %0, i64 -48
22 %counter.i = bitcast i8* %usage to i32*
23 %call95 = tail call signext i32 bitcast (i32 (...)* @__raw_read_unlock to i32 (%struct.rwlock_t.0.22.58.68.242.244*)*)(%struct.rwlock_t.0.22.58.68.242.244* nonnull @tasklist_lock) #1
24 store volatile i32 0, i32* %p2, align 4
25 tail call void asm sideeffect "#compiler barrier", "~{memory}"() #1
26 %1 = tail call i32 asm sideeffect "\0Alwsync \0A1:\09lwarx\09$0,0,$1\09\09# atomic_dec_return\0A\09addic\09$0,$0,-1\0A\09stwcx.\09$0,0,$1\0A\09bne-\091b\0Async \0A", "=&r,r,~{cc},~{xer},~{memory}"(i32* %counter.i) #1
27 %cmp.i = icmp eq i32 %1, 0
28 br i1 %cmp.i, label %if.then.i, label %put_task_struct.exit
30 if.then.i: ; preds = %do.body.92
33 put_task_struct.exit: ; preds = %do.body.92
37 declare signext i32 @__raw_read_unlock(...)
39 attributes #0 = { nounwind "target-cpu"="pwr7" }
40 attributes #1 = { nounwind }
44 name: mm_update_next_owner
46 exposesReturnsTwice: false
47 tracksRegLiveness: true
52 isFrameAddressTaken: false
53 isReturnAddressTaken: false
62 hasOpaqueSPAdjustment: false
64 hasMustTailInVarArgFunc: false
66 - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$x30' }
67 - { id: 1, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$x29' }
70 liveins: $x3, $x4, $x29, $x30, $x29, $x30
72 $x0 = MFLR8 implicit $lr8
74 $x1 = STDU $x1, -144, $x1
75 STD killed $x29, 120, $x1 :: (store 8 into %fixed-stack.1)
76 STD killed $x30, 128, $x1 :: (store 8 into %fixed-stack.0, align 16)
78 $x3 = LD 0, killed $x3 :: (load 8 from %ir.p1)
79 $x29 = ADDI8 killed $x3, -48
80 $x3 = ADDIStocHA8 $x2, @tasklist_lock
81 $x3 = LDtocL @tasklist_lock, killed $x3, implicit $x2 :: (load 8 from got)
82 BL8_NOP @__raw_read_unlock, csr_svr464_altivec, implicit-def $lr8, implicit $rm, implicit $x3, implicit $x2, implicit-def $r1, implicit-def dead $x3
84 STW killed $r3, 0, killed $x30 :: (volatile store 4 into %ir.p2)
85 INLINEASM &"#compiler barrier", 25
86 INLINEASM &"\0Alwsync \0A1:\09lwarx\09$0,0,$1\09\09# atomic_dec_return\0A\09addic\09$0,$0,-1\0A\09stwcx.\09$0,0,$1\0A\09bne-\091b\0Async \0A", 25, 131083, def early-clobber $r3, 851977, killed $x29, 12, implicit-def dead early-clobber $cr0
87 ; CHECK-LABEL: @mm_update_next_owner
88 ; CHECK-NOT: lwarx 29, 0, 29
89 ; CHECK-NOT: stwcx. 29, 0, 29
90 $cr0 = CMPLWI killed $r3, 0
91 $x30 = LD 128, $x1 :: (load 8 from %fixed-stack.0, align 16)
92 $x29 = LD 120, $x1 :: (load 8 from %fixed-stack.1)
95 MTLR8 $x0, implicit-def $lr8
96 BLR8 implicit $lr8, implicit $rm