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Diffstat (limited to 'test/Transforms/DeadStoreElimination/atomic.ll')
-rw-r--r-- | test/Transforms/DeadStoreElimination/atomic.ll | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/test/Transforms/DeadStoreElimination/atomic.ll b/test/Transforms/DeadStoreElimination/atomic.ll new file mode 100644 index 0000000..2e84298 --- /dev/null +++ b/test/Transforms/DeadStoreElimination/atomic.ll @@ -0,0 +1,107 @@ +; 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 +} + |