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Implement Instcombine/and.ll:test34

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26155 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-02-13 23:07:23 +00:00
parent 1f7b4e685e
commit 2082ad9b41
1 changed files with 12 additions and 0 deletions

12
lib/Transforms/Scalar/InstructionCombining.cpp

@ -2439,6 +2439,18 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
InsertNewInstBefore(Or, I);
return BinaryOperator::createNot(Or);
}
{
Value *A = 0, *B = 0;
ConstantInt *C1 = 0, *C2 = 0;
if (match(Op0, m_Or(m_Value(A), m_Value(B))))
if (A == Op1 || B == Op1) // (A | ?) & A --> A
return ReplaceInstUsesWith(I, Op1);
if (match(Op1, m_Or(m_Value(A), m_Value(B))))
if (A == Op0 || B == Op0) // A & (A | ?) --> A
return ReplaceInstUsesWith(I, Op0);
}
if (SetCondInst *RHS = dyn_cast<SetCondInst>(Op1)) {
// (setcc1 A, B) & (setcc2 A, B) --> (setcc3 A, B)