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108 lines
2.7 KiB
LLVM
108 lines
2.7 KiB
LLVM
; RUN: opt -basicaa -dse -S < %s | FileCheck %s
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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"
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target triple = "x86_64-apple-macosx10.7.0"
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; Sanity tests for atomic stores.
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; Note that it turns out essentially every transformation DSE does is legal on
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; atomic ops, just some transformations are not allowed across them.
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@x = common global i32 0, align 4
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@y = common global i32 0, align 4
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declare void @randomop(i32*)
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; DSE across unordered store (allowed)
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define void @test1() nounwind uwtable ssp {
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; CHECK: test1
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; CHECK-NOT: store i32 0
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; CHECK: store i32 1
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entry:
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store i32 0, i32* @x
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store atomic i32 0, i32* @y unordered, align 4
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store i32 1, i32* @x
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ret void
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}
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; DSE across seq_cst load (allowed in theory; not implemented ATM)
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define i32 @test2() nounwind uwtable ssp {
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; CHECK: test2
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; CHECK: store i32 0
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; CHECK: store i32 1
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entry:
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store i32 0, i32* @x
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%x = load atomic i32* @y seq_cst, align 4
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store i32 1, i32* @x
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ret i32 %x
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}
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; DSE across seq_cst store (store before atomic store must not be removed)
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define void @test3() nounwind uwtable ssp {
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; CHECK: test3
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; CHECK: store i32
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; CHECK: store atomic i32 2
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entry:
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store i32 0, i32* @x
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store atomic i32 2, i32* @y seq_cst, align 4
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store i32 1, i32* @x
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ret void
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}
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; DSE remove unordered store (allowed)
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define void @test4() nounwind uwtable ssp {
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; CHECK: test4
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; CHECK-NOT: store atomic
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; CHECK: store i32 1
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entry:
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store atomic i32 0, i32* @x unordered, align 4
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store i32 1, i32* @x
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ret void
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}
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; DSE unordered store overwriting non-atomic store (allowed)
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define void @test5() nounwind uwtable ssp {
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; CHECK: test5
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; CHECK: store atomic i32 1
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entry:
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store i32 0, i32* @x
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store atomic i32 1, i32* @x unordered, align 4
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ret void
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}
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; DSE no-op unordered atomic store (allowed)
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define void @test6() nounwind uwtable ssp {
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; CHECK: test6
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; CHECK-NOT: store
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; CHECK: ret void
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entry:
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%x = load atomic i32* @x unordered, align 4
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store atomic i32 %x, i32* @x unordered, align 4
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ret void
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}
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; DSE seq_cst store (be conservative; DSE doesn't have infrastructure
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; to reason about atomic operations).
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define void @test7() nounwind uwtable ssp {
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; CHECK: test7
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; CHECK: store atomic
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entry:
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%a = alloca i32
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store atomic i32 0, i32* %a seq_cst, align 4
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ret void
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}
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; DSE and seq_cst load (be conservative; DSE doesn't have infrastructure
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; to reason about atomic operations).
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define i32 @test8() nounwind uwtable ssp {
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; CHECK: test8
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; CHECK: store
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; CHECK: load atomic
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entry:
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%a = alloca i32
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call void @randomop(i32* %a)
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store i32 0, i32* %a, align 4
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%x = load atomic i32* @x seq_cst, align 4
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ret i32 %x
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}
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