mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
56efe24431
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137888 91177308-0d34-0410-b5e6-96231b3b80d8
108 lines
2.7 KiB
LLVM
108 lines
2.7 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 them.
|
|
|
|
@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() nounwind uwtable ssp {
|
|
; CHECK: test1
|
|
; CHECK-NOT: store i32 0
|
|
; CHECK: store i32 1
|
|
entry:
|
|
store i32 0, i32* @x
|
|
store atomic i32 0, i32* @y unordered, align 4
|
|
store i32 1, i32* @x
|
|
ret void
|
|
}
|
|
|
|
; DSE across seq_cst load (allowed in theory; not implemented ATM)
|
|
define i32 @test2() nounwind uwtable ssp {
|
|
; CHECK: test2
|
|
; CHECK: store i32 0
|
|
; CHECK: store i32 1
|
|
entry:
|
|
store i32 0, i32* @x
|
|
%x = load atomic i32* @y seq_cst, align 4
|
|
store i32 1, i32* @x
|
|
ret i32 %x
|
|
}
|
|
|
|
; DSE across seq_cst store (store before atomic store must not be removed)
|
|
define void @test3() nounwind uwtable ssp {
|
|
; CHECK: test3
|
|
; CHECK: store i32
|
|
; CHECK: store atomic i32 2
|
|
entry:
|
|
store i32 0, i32* @x
|
|
store atomic i32 2, i32* @y seq_cst, align 4
|
|
store i32 1, i32* @x
|
|
ret void
|
|
}
|
|
|
|
; DSE remove unordered store (allowed)
|
|
define void @test4() nounwind uwtable ssp {
|
|
; CHECK: test4
|
|
; CHECK-NOT: store atomic
|
|
; CHECK: store i32 1
|
|
entry:
|
|
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() nounwind uwtable ssp {
|
|
; CHECK: test5
|
|
; CHECK: store atomic i32 1
|
|
entry:
|
|
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() nounwind uwtable ssp {
|
|
; CHECK: test6
|
|
; CHECK-NOT: store
|
|
; CHECK: ret void
|
|
entry:
|
|
%x = load atomic 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() nounwind uwtable ssp {
|
|
; CHECK: test7
|
|
; CHECK: store atomic
|
|
entry:
|
|
%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() nounwind uwtable ssp {
|
|
; CHECK: test8
|
|
; CHECK: store
|
|
; CHECK: load atomic
|
|
entry:
|
|
%a = alloca i32
|
|
call void @randomop(i32* %a)
|
|
store i32 0, i32* %a, align 4
|
|
%x = load atomic i32* @x seq_cst, align 4
|
|
ret i32 %x
|
|
}
|
|
|