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| author | Matthijs Kooijman <matthijs@stdin.nl> | 2008-10-06 16:23:31 +0000 |
|---|---|---|
| committer | Matthijs Kooijman <matthijs@stdin.nl> | 2008-10-06 16:23:31 +0000 |
| commit | 5fac55fafb53fde5c548bcd08e07418e9d8e549f (patch) | |
| tree | f3737347a6427884e6ccedf027587d1933c70c43 /test/Transforms/ScalarRepl | |
| parent | 96f945267c986ddedf3ec1af0f131841b056bc25 (diff) | |
| download | llvm-5fac55fafb53fde5c548bcd08e07418e9d8e549f.tar.gz llvm-5fac55fafb53fde5c548bcd08e07418e9d8e549f.tar.bz2 llvm-5fac55fafb53fde5c548bcd08e07418e9d8e549f.tar.xz | |
Allow scalarrepl to treat an all-zero GEP just as bitcast.
This includes not marking a GEP involving a vector as unsafe, but only when it
has all zero indices. This allows scalarrepl to work in a few more cases.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57177 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/ScalarRepl')
| -rw-r--r-- | test/Transforms/ScalarRepl/2008-09-22-vector-gep.ll | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/Transforms/ScalarRepl/2008-09-22-vector-gep.ll b/test/Transforms/ScalarRepl/2008-09-22-vector-gep.ll new file mode 100644 index 0000000000..6640383973 --- /dev/null +++ b/test/Transforms/ScalarRepl/2008-09-22-vector-gep.ll @@ -0,0 +1,24 @@ +; This test checks to see if scalarrepl also works when a gep with all zeroes is +; used instead of a bitcast to prepare a memmove pointer argument. Previously, +; this would not work when there was a vector involved in the struct, preventing +; scalarrepl from removing the alloca below. + +; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis > %t +; RUN: cat %t | not grep alloca + +%struct.two = type <{ < 2 x i8 >, i16 }> + +define void @main(%struct.two* %D, i16 %V) { +entry: + %S = alloca %struct.two + %S.2 = getelementptr %struct.two* %S, i32 0, i32 1 + store i16 %V, i16* %S.2 + ; This gep is effectively a bitcast to i8*, but is sometimes generated + ; because the type of the first element in %struct.two is i8. + %tmpS = getelementptr %struct.two* %S, i32 0, i32 0, i32 0 + %tmpD = bitcast %struct.two* %D to i8* + call void @llvm.memmove.i32(i8* %tmpD, i8* %tmpS, i32 4, i32 1) + ret void +} + +declare void @llvm.memmove.i32(i8*, i8*, i32, i32) nounwind |