forked from OSchip/llvm-project
133 lines
3.5 KiB
LLVM
133 lines
3.5 KiB
LLVM
; RUN: opt -basicaa -dse -S < %s | FileCheck %s
|
|
|
|
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
|
|
target triple = "x86_64-apple-macosx10.7.0"
|
|
|
|
; Sanity tests for atomic stores.
|
|
; Note that it turns out essentially every transformation DSE does is legal on
|
|
; atomic ops, just some transformations are not allowed across release-acquire pairs.
|
|
|
|
@x = common global i32 0, align 4
|
|
@y = common global i32 0, align 4
|
|
|
|
declare void @randomop(i32*)
|
|
|
|
; DSE across unordered store (allowed)
|
|
define void @test1() {
|
|
; CHECK-LABEL: test1
|
|
; CHECK-NOT: store i32 0
|
|
; CHECK: store i32 1
|
|
store i32 0, i32* @x
|
|
store atomic i32 0, i32* @y unordered, align 4
|
|
store i32 1, i32* @x
|
|
ret void
|
|
}
|
|
|
|
; DSE remove unordered store (allowed)
|
|
define void @test4() {
|
|
; CHECK-LABEL: test4
|
|
; CHECK-NOT: store atomic
|
|
; CHECK: store i32 1
|
|
store atomic i32 0, i32* @x unordered, align 4
|
|
store i32 1, i32* @x
|
|
ret void
|
|
}
|
|
|
|
; DSE unordered store overwriting non-atomic store (allowed)
|
|
define void @test5() {
|
|
; CHECK-LABEL: test5
|
|
; CHECK: store atomic i32 1
|
|
store i32 0, i32* @x
|
|
store atomic i32 1, i32* @x unordered, align 4
|
|
ret void
|
|
}
|
|
|
|
; DSE no-op unordered atomic store (allowed)
|
|
define void @test6() {
|
|
; CHECK-LABEL: test6
|
|
; CHECK-NOT: store
|
|
; CHECK: ret void
|
|
%x = load atomic i32, i32* @x unordered, align 4
|
|
store atomic i32 %x, i32* @x unordered, align 4
|
|
ret void
|
|
}
|
|
|
|
; DSE seq_cst store (be conservative; DSE doesn't have infrastructure
|
|
; to reason about atomic operations).
|
|
define void @test7() {
|
|
; CHECK-LABEL: test7
|
|
; CHECK: store atomic
|
|
%a = alloca i32
|
|
store atomic i32 0, i32* %a seq_cst, align 4
|
|
ret void
|
|
}
|
|
|
|
; DSE and seq_cst load (be conservative; DSE doesn't have infrastructure
|
|
; to reason about atomic operations).
|
|
define i32 @test8() {
|
|
; CHECK-LABEL: test8
|
|
; CHECK: store
|
|
; CHECK: load atomic
|
|
%a = alloca i32
|
|
call void @randomop(i32* %a)
|
|
store i32 0, i32* %a, align 4
|
|
%x = load atomic i32, i32* @x seq_cst, align 4
|
|
ret i32 %x
|
|
}
|
|
|
|
; DSE across monotonic load (allowed as long as the eliminated store isUnordered)
|
|
define i32 @test9() {
|
|
; CHECK-LABEL: test9
|
|
; CHECK-NOT: store i32 0
|
|
; CHECK: store i32 1
|
|
store i32 0, i32* @x
|
|
%x = load atomic i32, i32* @y monotonic, align 4
|
|
store i32 1, i32* @x
|
|
ret i32 %x
|
|
}
|
|
|
|
; DSE across monotonic store (allowed as long as the eliminated store isUnordered)
|
|
define void @test10() {
|
|
; CHECK-LABEL: test10
|
|
; CHECK-NOT: store i32 0
|
|
; CHECK: store i32 1
|
|
store i32 0, i32* @x
|
|
store atomic i32 42, i32* @y monotonic, align 4
|
|
store i32 1, i32* @x
|
|
ret void
|
|
}
|
|
|
|
; DSE across monotonic load (forbidden since the eliminated store is atomic)
|
|
define i32 @test11() {
|
|
; CHECK-LABEL: test11
|
|
; CHECK: store atomic i32 0
|
|
; CHECK: store atomic i32 1
|
|
store atomic i32 0, i32* @x monotonic, align 4
|
|
%x = load atomic i32, i32* @y monotonic, align 4
|
|
store atomic i32 1, i32* @x monotonic, align 4
|
|
ret i32 %x
|
|
}
|
|
|
|
; DSE across monotonic store (forbidden since the eliminated store is atomic)
|
|
define void @test12() {
|
|
; CHECK-LABEL: test12
|
|
; CHECK: store atomic i32 0
|
|
; CHECK: store atomic i32 1
|
|
store atomic i32 0, i32* @x monotonic, align 4
|
|
store atomic i32 42, i32* @y monotonic, align 4
|
|
store atomic i32 1, i32* @x monotonic, align 4
|
|
ret void
|
|
}
|
|
|
|
; But DSE is not allowed across a release-acquire pair.
|
|
define i32 @test15() {
|
|
; CHECK-LABEL: test15
|
|
; CHECK: store i32 0
|
|
; CHECK: store i32 1
|
|
store i32 0, i32* @x
|
|
store atomic i32 0, i32* @y release, align 4
|
|
%x = load atomic i32, i32* @y acquire, align 4
|
|
store i32 1, i32* @x
|
|
ret i32 %x
|
|
}
|