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make IRBuilder zap "X|0" and "X&-1" when building IR, this happens

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during bitfield codegen and slows down -O0 compile times by making
useless IR.  rdar://7362516


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86006 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-11-04 05:00:12 +00:00
parent 1fce948ccb
commit 6bffa63dfe
1 changed files with 10 additions and 4 deletions
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14
include/llvm/Support/IRBuilder.h
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@ -390,15 +390,21 @@ public:
return Insert(BinaryOperator::CreateAShr(LHS, RHS), Name);
}
Value *CreateAnd(Value *LHS, Value *RHS, const Twine &Name = "") {
if (Constant *LC = dyn_cast<Constant>(LHS))
if (Constant *RC = dyn_cast<Constant>(RHS))
if (Constant *RC = dyn_cast<Constant>(RHS)) {
if (isa<ConstantInt>(RC) && cast<ConstantInt>(RC)->isAllOnesValue())
return LHS; // LHS & -1 -> LHS
if (Constant *LC = dyn_cast<Constant>(LHS))
return Folder.CreateAnd(LC, RC);
}
return Insert(BinaryOperator::CreateAnd(LHS, RHS), Name);
}
Value *CreateOr(Value *LHS, Value *RHS, const Twine &Name = "") {
if (Constant *LC = dyn_cast<Constant>(LHS))
if (Constant *RC = dyn_cast<Constant>(RHS))
if (Constant *RC = dyn_cast<Constant>(RHS)) {
if (RC->isNullValue())
return LHS; // LHS | 0 -> LHS
if (Constant *LC = dyn_cast<Constant>(LHS))
return Folder.CreateOr(LC, RC);
}
return Insert(BinaryOperator::CreateOr(LHS, RHS), Name);
}
Value *CreateXor(Value *LHS, Value *RHS, const Twine &Name = "") {