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| author | David Majnemer <david.majnemer@gmail.com> | 2013-05-08 06:44:42 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2013-05-08 06:44:42 +0000 |
| commit | 363160a6be82df343fa60aa09d9d8f8f44605529 (patch) | |
| tree | 8385f9313f583f6f7f9bcf1d53a42ebe4475e14a /test/CodeGen/X86 | |
| parent | aa76a93cd35abd922b66825bb4e3e0b6e14ccfd5 (diff) | |
| download | llvm-363160a6be82df343fa60aa09d9d8f8f44605529.tar.gz llvm-363160a6be82df343fa60aa09d9d8f8f44605529.tar.bz2 llvm-363160a6be82df343fa60aa09d9d8f8f44605529.tar.xz | |
DAGCombiner: Simplify inverted bit tests
Fold (xor (and x, y), y) -> (and (not x), y)
This removes an opportunity for a constant to appear twice.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181395 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86')
| -rw-r--r-- | test/CodeGen/X86/xor.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/CodeGen/X86/xor.ll b/test/CodeGen/X86/xor.ll index 996bfc40ee..2408bfe72c 100644 --- a/test/CodeGen/X86/xor.ll +++ b/test/CodeGen/X86/xor.ll @@ -142,3 +142,15 @@ entry: ; X32: test8: ; X32: notl %eax } + +define i32 @test9(i32 %a) nounwind { + %1 = and i32 %a, 4096 + %2 = xor i32 %1, 4096 + ret i32 %2 +; X64: test9: +; X64: notl [[REG:%[a-z]+]] +; X64: andl {{.*}}[[REG:%[a-z]+]] +; X32: test9: +; X32: notl [[REG:%[a-z]+]] +; X32: andl {{.*}}[[REG:%[a-z]+]] +} |