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| author | Dan Gohman <dan433584@gmail.com> | 2013-01-31 00:01:45 +0000 |
|---|---|---|
| committer | Dan Gohman <dan433584@gmail.com> | 2013-01-31 00:01:45 +0000 |
| commit | d363ae52995059906d99f7588f47bf891e7db485 (patch) | |
| tree | 5422d9606820e707f04d8569a5097619f31c86a1 /test/Assembler | |
| parent | 69f60e7c4a77866b3d0a5907e4955baa05216a20 (diff) | |
| download | llvm-d363ae52995059906d99f7588f47bf891e7db485.tar.gz llvm-d363ae52995059906d99f7588f47bf891e7db485.tar.bz2 llvm-d363ae52995059906d99f7588f47bf891e7db485.tar.xz | |
Fix ConstantFold's folding of icmp instructions to recognize that,
for example, a one-past-the-end pointer from one global variable may
be equal to the base pointer of another global variable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173995 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Assembler')
| -rw-r--r-- | test/Assembler/ConstantExprNoFold.ll | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/Assembler/ConstantExprNoFold.ll b/test/Assembler/ConstantExprNoFold.ll new file mode 100644 index 0000000000..83e8909b5e --- /dev/null +++ b/test/Assembler/ConstantExprNoFold.ll @@ -0,0 +1,23 @@ +; This test checks to make sure that constant exprs don't fold in some simple +; situations + +; RUN: llvm-as < %s | llvm-dis | FileCheck %s + +; Even give it a datalayout, to tempt folding as much as possible. +target datalayout = "p:32:32" + +@A = global i64 0 +@B = global i64 0 + +; Don't fold this. @A might really be allocated next to @B, in which case the +; icmp should return true. It's not valid to *dereference* in @B from a pointer +; based on @A, but icmp isn't a dereference. + +; CHECK: @C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B) +@C = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* @B) + +; Don't fold this completely away either. In theory this could be simplified +; to only use a gep on one side of the icmp though. + +; CHECK: @D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2)) +@D = global i1 icmp eq (i64* getelementptr inbounds (i64* @A, i64 1), i64* getelementptr inbounds (i64* @B, i64 2)) |