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For PR950:

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First in a series of patches to convert SetCondInst into ICmpInst and
FCmpInst using only two opcodes and having the instructions contain their
predicate value. Nothing uses these classes yet. More patches to follow.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31867 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer
2006-11-20 01:22:35 +00:00
parent 36699cabc5
commit 45fb3f3cb2
9 changed files with 642 additions and 15 deletions
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23
lib/Analysis/ValueNumbering.cpp
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@@ -75,6 +75,7 @@ namespace {
void visitCastInst(CastInst &I);
void visitGetElementPtrInst(GetElementPtrInst &I);
void visitCmpInst(CmpInst &I);
void handleBinaryInst(Instruction &I);
void visitBinaryOperator(Instruction &I) { handleBinaryInst(I); }
@@ -124,6 +125,28 @@ void BVNImpl::visitCastInst(CastInst &CI) {
}
}
void BVNImpl::visitCmpInst(CmpInst &CI1) {
Value *LHS = CI1.getOperand(0);
for (Value::use_iterator UI = LHS->use_begin(), UE = LHS->use_end();
UI != UE; ++UI)
if (CmpInst *CI2 = dyn_cast<CmpInst>(*UI))
// Check to see if this compare instruction is not CI, but same opcode,
// same predicate, and in the same function.
if (CI2 != &CI1 && CI2->getOpcode() == CI1.getOpcode() &&
CI2->getPredicate() == CI1.getPredicate() &&
CI2->getParent()->getParent() == CI1.getParent()->getParent())
// If the operands are the same
if ((CI2->getOperand(0) == CI1.getOperand(0) &&
CI2->getOperand(1) == CI1.getOperand(1)) ||
// Or the compare is commutative and the operands are reversed
(CI1.isCommutative() &&
CI2->getOperand(0) == CI1.getOperand(1) &&
CI2->getOperand(1) == CI1.getOperand(0)))
// Then the instructiosn are identical, add to list.
RetVals.push_back(CI2);
}
// isIdenticalBinaryInst - Return true if the two binary instructions are
// identical.