51 lines
1.3 KiB
LLVM
51 lines
1.3 KiB
LLVM
; XFAIL: *
|
|
|
|
; RUN: opt -S -basic-aa -dse < %s | FileCheck %s
|
|
|
|
; We DSE stack alloc'ed and byval locations, in the presence of fences.
|
|
; Fence does not make an otherwise thread local store visible.
|
|
; Right now the DSE in presence of fence is only done in end blocks (with no successors),
|
|
; but the same logic applies to other basic blocks as well.
|
|
; The store to %addr.i can be removed since it is a byval attribute
|
|
define void @test3(i32* byval(i32) %addr.i) {
|
|
; CHECK-LABEL: @test3
|
|
; CHECK-NOT: store
|
|
; CHECK: fence
|
|
; CHECK: ret
|
|
store i32 5, i32* %addr.i, align 4
|
|
fence release
|
|
ret void
|
|
}
|
|
|
|
declare void @foo(i8* nocapture %p)
|
|
|
|
declare noalias i8* @malloc(i32)
|
|
|
|
; DSE of stores in locations allocated through library calls.
|
|
define void @test_nocapture() {
|
|
; CHECK-LABEL: @test_nocapture
|
|
; CHECK: malloc
|
|
; CHECK: foo
|
|
; CHECK-NOT: store
|
|
; CHECK: fence
|
|
%m = call i8* @malloc(i32 24)
|
|
call void @foo(i8* %m)
|
|
store i8 4, i8* %m
|
|
fence release
|
|
ret void
|
|
}
|
|
|
|
|
|
; This is a full fence, but it does not make a thread local store visible.
|
|
; We can DSE the store in presence of the fence.
|
|
define void @fence_seq_cst() {
|
|
; CHECK-LABEL: @fence_seq_cst
|
|
; CHECK-NEXT: fence seq_cst
|
|
; CHECK-NEXT: ret void
|
|
%P1 = alloca i32
|
|
store i32 0, i32* %P1, align 4
|
|
fence seq_cst
|
|
store i32 4, i32* %P1, align 4
|
|
ret void
|
|
}
|