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author | Chris Lattner <sabre@nondot.org> | 2003-11-04 23:37:10 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2003-11-04 23:37:10 +0000 |
commit | 689d24b6ed709ea2dbeee5741c0b9ac8c658d92e (patch) | |
tree | 183094005bace666f26250dcb3fc29cb7f7e38dc /lib/Transforms/Scalar | |
parent | 736cca670f9149cc381a519abc2f22e9a720de76 (diff) | |
download | external_llvm-689d24b6ed709ea2dbeee5741c0b9ac8c658d92e.zip external_llvm-689d24b6ed709ea2dbeee5741c0b9ac8c658d92e.tar.gz external_llvm-689d24b6ed709ea2dbeee5741c0b9ac8c658d92e.tar.bz2 |
Implement InstCombine/xor.ll:test(15|16)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9708 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar')
-rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 2780189..88026c3 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -1002,7 +1002,14 @@ Instruction *InstCombiner::visitXor(BinaryOperator &I) { SCI->getOperand(0), SCI->getOperand(1)); if (ConstantInt *Op0CI = dyn_cast<ConstantInt>(Op0I->getOperand(1))) - if (Op0I->getOpcode() == Instruction::And) { + if (Op0I->getOpcode() == Instruction::Add) { + // ~(X-c) --> (-c-1)-X + if (RHS->isAllOnesValue()) + return BinaryOperator::create(Instruction::Sub, + *-*Op0CI - + *ConstantInt::get(I.getType(), 1), + Op0I->getOperand(0)); + } else if (Op0I->getOpcode() == Instruction::And) { // (X & C1) ^ C2 --> (X & C1) | C2 iff (C1&C2) == 0 if ((*RHS & *Op0CI)->isNullValue()) return BinaryOperator::create(Instruction::Or, Op0, RHS); |