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Add BSWAP stuff to intrinsic lowering for CBE & friends.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25355 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2006-01-16 07:57:00 +00:00
parent 099d76cf15
commit e598181889
1 changed files with 106 additions and 2 deletions
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108
lib/CodeGen/IntrinsicLowering.cpp
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@ -128,8 +128,102 @@ void DefaultIntrinsicLowering::AddPrototypes(Module &M) {
}
}
/// LowerBSWAP - Emit the code to lower bswap of V before the specified
/// instruction IP.
static Value *LowerBSWAP(Value *V, Instruction *IP) {
assert(V->getType()->isInteger() && "Can't bswap a non-integer type!");
const Type *DestTy = V->getType();
// Force to unsigned so that the shift rights are logical.
if (DestTy->isSigned())
V = new CastInst(V, DestTy->getUnsignedVersion(), V->getName(), IP);
unsigned BitSize = V->getType()->getPrimitiveSizeInBits();
switch(BitSize) {
default: assert(0 && "Unhandled type size of value to byteswap!");
case 16: {
Value *Tmp1 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.2",IP);
Value *Tmp2 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.1",IP);
V = BinaryOperator::createOr(Tmp1, Tmp2, "bswap.i16", IP);
break;
}
case 32: {
Value *Tmp4 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,24),"bswap.4", IP);
Value *Tmp3 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.3",IP);
Value *Tmp2 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.2",IP);
Value *Tmp1 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,24),"bswap.1", IP);
Tmp3 = BinaryOperator::createAnd(Tmp3,
ConstantUInt::get(Type::UIntTy, 0xFF0000),
"bswap.and3", IP);
Tmp2 = BinaryOperator::createAnd(Tmp2,
ConstantUInt::get(Type::UIntTy, 0xFF00),
"bswap.and2", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or1", IP);
Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or2", IP);
V = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.i32", IP);
break;
}
case 64: {
Value *Tmp8 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,56),"bswap.8", IP);
Value *Tmp7 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,40),"bswap.7", IP);
Value *Tmp6 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,24),"bswap.6", IP);
Value *Tmp5 = new ShiftInst(Instruction::Shl, V,
ConstantInt::get(Type::UByteTy,8),"bswap.5",IP);
Value *Tmp4 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,8),"bswap.4",IP);
Value *Tmp3 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,24),"bswap.3", IP);
Value *Tmp2 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,40),"bswap.2", IP);
Value *Tmp1 = new ShiftInst(Instruction::Shr, V,
ConstantInt::get(Type::UByteTy,56),"bswap.1", IP);
Tmp7 = BinaryOperator::createAnd(Tmp7,
ConstantUInt::get(Type::ULongTy, 0xFF000000000000ULL),
"bswap.and7", IP);
Tmp6 = BinaryOperator::createAnd(Tmp6,
ConstantUInt::get(Type::ULongTy, 0xFF0000000000ULL),
"bswap.and6", IP);
Tmp5 = BinaryOperator::createAnd(Tmp5,
ConstantUInt::get(Type::ULongTy, 0xFF00000000ULL),
"bswap.and5", IP);
Tmp4 = BinaryOperator::createAnd(Tmp4,
ConstantUInt::get(Type::ULongTy, 0xFF000000ULL),
"bswap.and4", IP);
Tmp3 = BinaryOperator::createAnd(Tmp3,
ConstantUInt::get(Type::ULongTy, 0xFF0000ULL),
"bswap.and3", IP);
Tmp2 = BinaryOperator::createAnd(Tmp2,
ConstantUInt::get(Type::ULongTy, 0xFF00ULL),
"bswap.and2", IP);
Tmp8 = BinaryOperator::createOr(Tmp8, Tmp7, "bswap.or1", IP);
Tmp6 = BinaryOperator::createOr(Tmp6, Tmp5, "bswap.or2", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp3, "bswap.or3", IP);
Tmp2 = BinaryOperator::createOr(Tmp2, Tmp1, "bswap.or4", IP);
Tmp8 = BinaryOperator::createOr(Tmp8, Tmp6, "bswap.or5", IP);
Tmp4 = BinaryOperator::createOr(Tmp4, Tmp2, "bswap.or6", IP);
V = BinaryOperator::createOr(Tmp8, Tmp4, "bswap.i64", IP);
break;
}
}
if (V->getType() != DestTy)
V = new CastInst(V, DestTy, V->getName(), IP);
return V;
}
/// LowerCTPOP - Emit the code to lower ctpop of V before the specified
/// instruction.
/// instruction IP.
static Value *LowerCTPOP(Value *V, Instruction *IP) {
assert(V->getType()->isInteger() && "Can't ctpop a non-integer type!");
@ -163,7 +257,7 @@ static Value *LowerCTPOP(Value *V, Instruction *IP) {
}
/// LowerCTLZ - Emit the code to lower ctlz of V before the specified
/// instruction.
/// instruction IP.
static Value *LowerCTLZ(Value *V, Instruction *IP) {
const Type *DestTy = V->getType();
@ -185,6 +279,8 @@ static Value *LowerCTLZ(Value *V, Instruction *IP) {
return LowerCTPOP(V, IP);
}
void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
Function *Callee = CI->getCalledFunction();
assert(Callee && "Cannot lower an indirect call!");
@ -230,6 +326,13 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
AbortFCache);
break;
}
case Intrinsic::bswap_i16:
case Intrinsic::bswap_i32:
case Intrinsic::bswap_i64:
CI->replaceAllUsesWith(LowerBSWAP(CI->getOperand(1), CI));
break;
case Intrinsic::ctpop:
CI->replaceAllUsesWith(LowerCTPOP(CI->getOperand(1), CI));
break;
@ -237,6 +340,7 @@ void DefaultIntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
case Intrinsic::ctlz:
CI->replaceAllUsesWith(LowerCTLZ(CI->getOperand(1), CI));
break;
case Intrinsic::cttz: {
// cttz(x) -> ctpop(~X & (X-1))
Value *Src = CI->getOperand(1);