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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2014-05-31 15:01:54 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2014-05-31 15:01:54 +0000 |
| commit | 37bc2f3216ff656f8d6564413ffb418f616472c3 (patch) | |
| tree | 07e4846b82f9e8ffc65abdb7e13c2a1fb463990e /test | |
| parent | da5824d073415bb4a8f0841dc8ed2200bf4d42b7 (diff) | |
| download | llvm-37bc2f3216ff656f8d6564413ffb418f616472c3.tar.gz llvm-37bc2f3216ff656f8d6564413ffb418f616472c3.tar.bz2 llvm-37bc2f3216ff656f8d6564413ffb418f616472c3.tar.xz | |
[Reassociate] Similar to "X + -X" -> "0", added code to handle "X + ~X" -> "-1".
Handle "X + ~X" -> "-1" in the function Value *Reassociate::OptimizeAdd(Instruction *I, SmallVectorImpl<ValueEntry> &Ops);
This patch implements:
TODO: We could handle "X + ~X" -> "-1" if we wanted, since "-X = ~X+1".
Patch by Rahul Jain!
Differential Revision: http://reviews.llvm.org/D3835
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209973 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/Reassociate/inverses.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/Transforms/Reassociate/inverses.ll b/test/Transforms/Reassociate/inverses.ll index afe076caea..8500cd867f 100644 --- a/test/Transforms/Reassociate/inverses.ll +++ b/test/Transforms/Reassociate/inverses.ll @@ -32,3 +32,15 @@ define i32 @test3(i32 %b, i32 %a) { ; CHECK: %tmp.5 = add i32 %b, 1234 ; CHECK: ret i32 %tmp.5 } + +define i32 @test4(i32 %b, i32 %a) { + %tmp.1 = add i32 %a, 1234 + %tmp.2 = add i32 %b, %tmp.1 + %tmp.4 = xor i32 %a, -1 + ; (b+(a+1234))+~a -> b+1233 + %tmp.5 = add i32 %tmp.2, %tmp.4 + ret i32 %tmp.5 +; CHECK-LABEL: @test4( +; CHECK: %tmp.5 = add i32 %b, 1233 +; CHECK: ret i32 %tmp.5 +} |