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| author | Chris Lattner <sabre@nondot.org> | 2008-01-24 18:00:32 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-01-24 18:00:32 +0000 |
| commit | 9603f43d34038486070cdaff9e6ea0d98fced7aa (patch) | |
| tree | 7f3f0f8440cf5cedd8ceb46320fcf6f757450d3d /test/Analysis/BasicAA | |
| parent | 4864bb92d9a457bf16e3ac1b42dc9fbe594dcadc (diff) | |
| download | external_llvm-9603f43d34038486070cdaff9e6ea0d98fced7aa.zip external_llvm-9603f43d34038486070cdaff9e6ea0d98fced7aa.tar.gz external_llvm-9603f43d34038486070cdaff9e6ea0d98fced7aa.tar.bz2 | |
Teach basicaa that 'byval' arguments define a new memory location that
can't be aliased to other known objects. This allows us to know that byval
pointer args don't alias globals, etc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46315 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis/BasicAA')
| -rw-r--r-- | test/Analysis/BasicAA/byval.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/byval.ll b/test/Analysis/BasicAA/byval.ll new file mode 100644 index 0000000..f064419 --- /dev/null +++ b/test/Analysis/BasicAA/byval.ll @@ -0,0 +1,18 @@ +; RUN: llvm-as < %s | opt -gvn | llvm-dis | grep {ret i32 1} +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 = "i686-apple-darwin8" + %struct.x = type { i32, i32, i32, i32 } +@g = weak global i32 0 ; <i32*> [#uses=1] + +define i32 @foo(%struct.x* byval %a) nounwind { +entry: + %tmp1 = tail call i32 (...)* @bar( %struct.x* %a ) nounwind ; <i32> [#uses=0] + %tmp2 = getelementptr %struct.x* %a, i32 0, i32 0 ; <i32*> [#uses=2] + store i32 1, i32* %tmp2, align 4 + store i32 2, i32* @g, align 4 + %tmp4 = load i32* %tmp2, align 4 ; <i32> [#uses=1] + ret i32 %tmp4 +} + +declare i32 @bar(...) + |