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Diffstat (limited to 'test/Transforms/GVN/invariant-simple.ll')
| -rw-r--r-- | test/Transforms/GVN/invariant-simple.ll | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/Transforms/GVN/invariant-simple.ll b/test/Transforms/GVN/invariant-simple.ll new file mode 100644 index 0000000..6de75f1 --- /dev/null +++ b/test/Transforms/GVN/invariant-simple.ll @@ -0,0 +1,36 @@ +; RUN: opt < %s -gvn -S | FileCheck %s + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" +target triple = "i386-apple-darwin7" + +define i8 @test(i8* %P) nounwind { +; CHECK: @test +; CHECK-NOT: load +; CHECK: ret i8 +entry: + store i8 1, i8* %P + %0 = call {}* @llvm.invariant.start(i64 32, i8* %P) + %1 = tail call i32 @foo(i8* %P) + call void @llvm.invariant.end({}* %0, i64 32, i8* %P) + %2 = load i8* %P + ret i8 %2 +} + +define i8 @test2(i8* %P) nounwind { +; CHECK: @test2 +; CHECK: store i8 1 +; CHECK: store i8 2 +; CHECK: ret i8 0 +entry: + store i8 1, i8* %P + %0 = call {}* @llvm.invariant.start(i64 32, i8* %P) + %1 = tail call i32 @bar(i8* %P) + call void @llvm.invariant.end({}* %0, i64 32, i8* %P) + store i8 2, i8* %P + ret i8 0 +} + +declare i32 @foo(i8*) nounwind +declare i32 @bar(i8*) nounwind readonly +declare {}* @llvm.invariant.start(i64 %S, i8* nocapture %P) readonly +declare void @llvm.invariant.end({}* %S, i64 %SS, i8* nocapture %P)
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