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| author | Stephen Hines <srhines@google.com> | 2014-12-01 14:51:49 -0800 |
|---|---|---|
| committer | Stephen Hines <srhines@google.com> | 2014-12-02 16:08:10 -0800 |
| commit | 37ed9c199ca639565f6ce88105f9e39e898d82d0 (patch) | |
| tree | 8fb36d3910e3ee4c4e1b7422f4f017108efc52f5 /test/Transforms/GVN/noalias.ll | |
| parent | d2327b22152ced7bc46dc629fc908959e8a52d03 (diff) | |
| download | external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.zip external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.gz external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.bz2 | |
Update aosp/master LLVM for rebase to r222494.
Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
Diffstat (limited to 'test/Transforms/GVN/noalias.ll')
| -rw-r--r-- | test/Transforms/GVN/noalias.ll | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/test/Transforms/GVN/noalias.ll b/test/Transforms/GVN/noalias.ll new file mode 100644 index 0000000..a774f38 --- /dev/null +++ b/test/Transforms/GVN/noalias.ll @@ -0,0 +1,43 @@ +; RUN: opt -scoped-noalias -basicaa -gvn -S < %s | FileCheck %s + +define i32 @test1(i32* %p, i32* %q) { +; CHECK-LABEL: @test1(i32* %p, i32* %q) +; CHECK: load i32* %p +; CHECK-NOT: noalias +; CHECK: %c = add i32 %a, %a + %a = load i32* %p, !noalias !0 + %b = load i32* %p + %c = add i32 %a, %b + ret i32 %c +} + +define i32 @test2(i32* %p, i32* %q) { +; CHECK-LABEL: @test2(i32* %p, i32* %q) +; CHECK: load i32* %p, !alias.scope !0 +; CHECK: %c = add i32 %a, %a + %a = load i32* %p, !alias.scope !0 + %b = load i32* %p, !alias.scope !0 + %c = add i32 %a, %b + ret i32 %c +} + +; FIXME: In this case we can do better than intersecting the scopes, and can +; concatenate them instead. Both loads are in the same basic block, the first +; makes the second safe to speculatively execute, and there are no calls that may +; throw in between. +define i32 @test3(i32* %p, i32* %q) { +; CHECK-LABEL: @test3(i32* %p, i32* %q) +; CHECK: load i32* %p, !alias.scope !1 +; CHECK: %c = add i32 %a, %a + %a = load i32* %p, !alias.scope !1 + %b = load i32* %p, !alias.scope !2 + %c = add i32 %a, %b + ret i32 %c +} + +declare i32 @foo(i32*) readonly + +!0 = metadata !{metadata !0} +!1 = metadata !{metadata !1} +!2 = metadata !{metadata !0, metadata !1} + |