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simplify this code, make it work for ap ints

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llvm-svn: 35561
This commit is contained in:
Chris Lattner 2007-04-01 20:57:36 +00:00
parent 4fb170e47b
commit a66a97908c
1 changed files with 6 additions and 17 deletions
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23
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3594,14 +3594,14 @@ static bool CollectBSwapParts(Value *V, SmallVector<Value*, 8> &ByteValues) {
/// MatchBSwap - Given an OR instruction, check to see if this is a bswap idiom.
/// If so, insert the new bswap intrinsic and return it.
Instruction *InstCombiner::MatchBSwap(BinaryOperator &I) {
// We cannot bswap one byte.
if (I.getType() == Type::Int8Ty)
return 0;
const IntegerType *ITy = dyn_cast<IntegerType>(I.getType());
if (!ITy || ITy->getBitWidth() % 16)
return 0; // Can only bswap pairs of bytes. Can't do vectors.
/// ByteValues - For each byte of the result, we keep track of which value
/// defines each byte.
SmallVector<Value*, 8> ByteValues;
ByteValues.resize(TD->getTypeSize(I.getType()));
ByteValues.resize(ITy->getBitWidth()/8);
// Try to find all the pieces corresponding to the bswap.
if (CollectBSwapParts(I.getOperand(0), ByteValues) ||
@ -3616,20 +3616,9 @@ Instruction *InstCombiner::MatchBSwap(BinaryOperator &I) {
for (unsigned i = 1, e = ByteValues.size(); i != e; ++i)
if (ByteValues[i] != V)
return 0;
// If they do then *success* we can turn this into a bswap. Figure out what
// bswap to make it into.
const Type *Tys[] = { ITy, ITy };
Module *M = I.getParent()->getParent()->getParent();
const char *FnName = 0;
if (I.getType() == Type::Int16Ty)
FnName = "llvm.bswap.i16.i16";
else if (I.getType() == Type::Int32Ty)
FnName = "llvm.bswap.i32.i32";
else if (I.getType() == Type::Int64Ty)
FnName = "llvm.bswap.i64.i64";
else
assert(0 && "Unknown integer type!");
Constant *F = M->getOrInsertFunction(FnName, I.getType(), I.getType(), NULL);
Function *F = Intrinsic::getDeclaration(M, Intrinsic::bswap, Tys, 2);
return new CallInst(F, V);
}