diff options
| author | Chris Lattner <sabre@nondot.org> | 2008-06-16 06:19:11 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-06-16 06:19:11 +0000 |
| commit | 845f0d2f0fd4a268ca1b3df9afb3de523f6dfa9d (patch) | |
| tree | 255ed8fb7b8911de8afb50a2266df306e1b6ecae /test/Analysis | |
| parent | 8892b6f30792bbc56f40d01a4ae9834a55cf8b1a (diff) | |
| download | external_llvm-845f0d2f0fd4a268ca1b3df9afb3de523f6dfa9d.zip external_llvm-845f0d2f0fd4a268ca1b3df9afb3de523f6dfa9d.tar.gz external_llvm-845f0d2f0fd4a268ca1b3df9afb3de523f6dfa9d.tar.bz2 | |
If we are checking to see if the result of a call aliases a
pointer derived from a local allocation, if the local allocation
never escapes, the pointers can't alias. This implements PR2436
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52301 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Analysis')
| -rw-r--r-- | test/Analysis/BasicAA/no-escape-call.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/no-escape-call.ll b/test/Analysis/BasicAA/no-escape-call.ll new file mode 100644 index 0000000..ab1fea7 --- /dev/null +++ b/test/Analysis/BasicAA/no-escape-call.ll @@ -0,0 +1,23 @@ +; RUN: llvm-as < %s | opt -basicaa -gvn -instcombine | llvm-dis | grep {ret i1 true} +; PR2436 +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-darwin8" + +define i1 @foo(i32 %i) nounwind { +entry: + %arr = alloca [10 x i8*] ; <[10 x i8*]*> [#uses=1] + %tmp2 = call i8* @getPtr( ) nounwind ; <i8*> [#uses=2] + %tmp4 = getelementptr [10 x i8*]* %arr, i32 0, i32 %i ; <i8**> [#uses=2] + store i8* %tmp2, i8** %tmp4, align 4 + %tmp10 = getelementptr i8* %tmp2, i32 10 ; <i8*> [#uses=1] + store i8 42, i8* %tmp10, align 1 + %tmp14 = load i8** %tmp4, align 4 ; <i8*> [#uses=1] + %tmp16 = getelementptr i8* %tmp14, i32 10 ; <i8*> [#uses=1] + %tmp17 = load i8* %tmp16, align 1 ; <i8> [#uses=1] + %tmp19 = icmp eq i8 %tmp17, 42 ; <i1> [#uses=1] + ret i1 %tmp19 +} + +declare i8* @getPtr() + +declare void @abort() noreturn nounwind |