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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2013-09-23 14:16:38 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2013-09-23 14:16:38 +0000 |
| commit | baca5334db904819e6c0d26cd5f5203f82c44f6e (patch) | |
| tree | 5a0d51b9e5de6d2c3e8c316092805f3f8781ce1c /test/Transforms | |
| parent | 9a1aaeb012e593fba977015c5d8b6b1aa41a908c (diff) | |
| download | external_llvm-baca5334db904819e6c0d26cd5f5203f82c44f6e.zip external_llvm-baca5334db904819e6c0d26cd5f5203f82c44f6e.tar.gz external_llvm-baca5334db904819e6c0d26cd5f5203f82c44f6e.tar.bz2 | |
InstSimplify: Fold equality comparisons between non-inbounds GEPs.
Overflow doesn't affect the correctness of equalities. Computing this is cheap,
we just reuse the computation for the inbounds case and try to peel of more
non-inbounds GEPs. This pattern is unlikely to ever appear in code generated by
Clang, but SCEV occasionally produces it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191200 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstSimplify/compare.ll | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll index 0957949..73188aa 100644 --- a/test/Transforms/InstSimplify/compare.ll +++ b/test/Transforms/InstSimplify/compare.ll @@ -717,3 +717,12 @@ define i1 @alloca_gep(i64 %a, i64 %b) { ret i1 %cmp ; CHECK-NEXT: ret i1 false } + +define i1 @non_inbounds_gep_compare(i64* %a) { +; CHECK-LABEL: @non_inbounds_gep_compare( +; Equality compares with non-inbounds GEPs can be folded. + %x = getelementptr i64* %a, i64 42 + %cmp = icmp eq i64* %a, %x + ret i1 %cmp +; CHECK-NEXT: ret i1 false +} |