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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2010-12-11 09:42:59 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2010-12-11 09:42:59 +0000 |
| commit | 20e3b4b380e949af32eeb4f184c51bfd62286f1a (patch) | |
| tree | 7f97eebcd1c8322d1e0257e5c642042e2bd55c39 /test | |
| parent | a9688c4b5769be7a6a89350888b3173c97fe87ed (diff) | |
| download | llvm-20e3b4b380e949af32eeb4f184c51bfd62286f1a.tar.gz llvm-20e3b4b380e949af32eeb4f184c51bfd62286f1a.tar.bz2 llvm-20e3b4b380e949af32eeb4f184c51bfd62286f1a.tar.xz | |
Factor the (x & 2^n) ? 2^m : 0 instcombine into its own method and generalize it
to catch cases where n != m with a shift.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121608 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/InstCombine/select.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/select.ll b/test/Transforms/InstCombine/select.ll index 120d158aa6..e9efa74e1a 100644 --- a/test/Transforms/InstCombine/select.ll +++ b/test/Transforms/InstCombine/select.ll @@ -223,6 +223,31 @@ define i32 @test15d(i32 %X) { ; CHECK: ret i32 %t1 } +;; (a & 128) ? 256 : 0 +define i32 @test15e(i32 %X) { + %t1 = and i32 %X, 128 + %t2 = icmp ne i32 %t1, 0 + %t3 = select i1 %t2, i32 256, i32 0 + ret i32 %t3 +; CHECK: @test15e +; CHECK: %t1 = shl i32 %X, 1 +; CHECK: and i32 %t1, 256 +; CHECK: ret i32 +} + +;; (a & 128) ? 0 : 256 +define i32 @test15f(i32 %X) { + %t1 = and i32 %X, 128 + %t2 = icmp ne i32 %t1, 0 + %t3 = select i1 %t2, i32 0, i32 256 + ret i32 %t3 +; CHECK: @test15f +; CHECK: %t1 = shl i32 %X, 1 +; CHECK: and i32 %t1, 256 +; CHECK: xor i32 %{{.*}}, 256 +; CHECK: ret i32 +} + define i32 @test16(i1 %C, i32* %P) { %P2 = select i1 %C, i32* %P, i32* null %V = load i32* %P2 |