1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -licm < %s | FileCheck %s
%class.LiveThread = type { i64, %class.LiveThread* }
@globallive = external dso_local global i64, align 8
; The store should not be sunk (via scalar promotion) past the cmpxchg.
define void @test(%class.LiveThread* %live_thread) {
; CHECK-LABEL: @test(
; CHECK-NEXT: [[NEXT_UNPROCESSED_:%.*]] = getelementptr inbounds [[CLASS_LIVETHREAD:%.*]], %class.LiveThread* [[LIVE_THREAD:%.*]], i64 0, i32 1
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: store %class.LiveThread* undef, %class.LiveThread** [[NEXT_UNPROCESSED_]], align 8
; CHECK-NEXT: [[XCHG:%.*]] = cmpxchg weak i64* @globallive, i64 undef, i64 undef release monotonic, align 8
; CHECK-NEXT: [[DONE:%.*]] = extractvalue { i64, i1 } [[XCHG]], 1
; CHECK-NEXT: br i1 [[DONE]], label [[EXIT:%.*]], label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
%next_unprocessed_ = getelementptr inbounds %class.LiveThread, %class.LiveThread* %live_thread, i64 0, i32 1
br label %loop
loop:
store %class.LiveThread* undef, %class.LiveThread** %next_unprocessed_, align 8
%xchg = cmpxchg weak i64* @globallive, i64 undef, i64 undef release monotonic, align 8
%done = extractvalue { i64, i1 } %xchg, 1
br i1 %done, label %exit, label %loop
exit:
ret void
}
|
