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improve constant loading. Still sucks, but oh well

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llvm-svn: 25047
This commit is contained in:
Andrew Lenharth 2005-12-30 02:30:02 +00:00
parent ec7c28a28c
commit 3441657fb4
2 changed files with 53 additions and 17 deletions
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38
lib/Target/Alpha/AlphaISelDAGToDAG.cpp
View File

@ -38,13 +38,14 @@ namespace {
class AlphaDAGToDAGISel : public SelectionDAGISel {
AlphaTargetLowering AlphaLowering;
static const int IMM_LOW = -32768;
static const int IMM_HIGH = 32767;
static const int IMM_MULT = 65536;
static const int64_t IMM_LOW = -32768;
static const int64_t IMM_HIGH = 32767;
static const int64_t IMM_MULT = 65536;
public:
AlphaDAGToDAGISel(TargetMachine &TM)
: SelectionDAGISel(AlphaLowering), AlphaLowering(TM) {}
: SelectionDAGISel(AlphaLowering), AlphaLowering(TM)
{}
/// getI64Imm - Return a target constant with the specified value, of type
/// i64.
@ -240,17 +241,24 @@ SDOperand AlphaDAGToDAGISel::Select(SDOperand Op) {
return CurDAG->SelectNodeTo(N, Alpha::RETDAG, MVT::Other, Chain, InFlag);
}
case ISD::Constant: {
int64_t val = (int64_t)cast<ConstantSDNode>(N)->getValue();
if (val > (int64_t)IMM_HIGH +(int64_t)IMM_HIGH* (int64_t)IMM_MULT ||
val < (int64_t)IMM_LOW + (int64_t)IMM_LOW * (int64_t)IMM_MULT) {
MachineConstantPool *CP = BB->getParent()->getConstantPool();
ConstantUInt *C =
ConstantUInt::get(Type::getPrimitiveType(Type::ULongTyID) , val);
SDOperand Tmp, CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
Tmp = CurDAG->getTargetNode(Alpha::LDAHr, MVT::i64, CPI, getGlobalBaseReg());
return CurDAG->SelectNodeTo(N, Alpha::LDQr, MVT::i64, CPI, Tmp);
}
break;
uint64_t uval = cast<ConstantSDNode>(N)->getValue();
int64_t val = (int64_t)uval;
int32_t val32 = (int32_t)val;
if (val <= IMM_HIGH + IMM_HIGH * IMM_MULT &&
val >= IMM_LOW + IMM_LOW * IMM_MULT)
break; //(LDAH (LDA))
if ((uval >> 32) == 0 && //empty upper bits
val32 <= IMM_HIGH + IMM_HIGH * IMM_MULT &&
val32 >= IMM_LOW + IMM_LOW * IMM_MULT)
break; //(zext (LDAH (LDA)))
//Else use the constant pool
MachineConstantPool *CP = BB->getParent()->getConstantPool();
ConstantUInt *C =
ConstantUInt::get(Type::getPrimitiveType(Type::ULongTyID) , uval);
SDOperand Tmp, CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
Tmp = CurDAG->getTargetNode(Alpha::LDAHr, MVT::i64, CPI, getGlobalBaseReg());
return CurDAG->SelectNodeTo(N, Alpha::LDQr, MVT::i64, MVT::Other,
CPI, Tmp, CurDAG->getEntryNode());
}
case ISD::ConstantFP:
if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(N)) {

32
lib/Target/Alpha/AlphaInstrInfo.td
View File

@ -57,6 +57,20 @@ def immSExt16 : PatLeaf<(imm), [{
return (int64_t)N->getValue() == (int16_t)N->getValue();
}]>;
def SExtInt : SDNodeXForm<imm, [{
return getI64Imm(((int64_t)N->getValue() << 32) >> 32);
}]>;
def immSExt16int : PatLeaf<(imm), [{
// immSExt16 predicate - True if the immediate fits in a 16-bit sign extended
// field. Used by instructions like 'lda'.
int64_t val = (int64_t)N->getValue();
uint32_t uval32 = (uint32_t)val;
int32_t val32 = (int32_t)val;
return (int64_t)uval32 == val && val32 == (int16_t)val32;
}], SExtInt>;
def iZAPX : SDNodeXForm<imm, [{
// Transformation function: get the imm to ZAPi
uint64_t UImm = (uint64_t)N->getValue();
@ -778,12 +792,19 @@ def CVTTS : FPForm<0x16, 0x7AC, "cvtts/sui $RB,$RC",
//Constant handling
def immConst2Part : PatLeaf<(imm), [{
// immZAP predicate - True if the immediate fits is suitable for use in a
// ZAP instruction
//true if imm fits in a LDAH LDA pair
int64_t val = (int64_t)N->getValue();
return (val <= (int64_t)IMM_HIGH +(int64_t)IMM_HIGH* (int64_t)IMM_MULT &
val >= (int64_t)IMM_LOW + (int64_t)IMM_LOW * (int64_t)IMM_MULT);
}]>;
def immConst2PartInt : PatLeaf<(imm), [{
//true if imm fits in a LDAH LDA pair with zeroext
uint64_t uval = N->getValue();
int32_t val32 = (int32_t)uval;
return ((uval >> 32) == 0 && //empty upper bits
val32 <= IMM_HIGH + IMM_HIGH * IMM_MULT &&
val32 >= IMM_LOW + IMM_LOW * IMM_MULT);
}], SExtInt>;
//TODO: factor this out
def LL16 : SDNodeXForm<imm, [{
@ -808,6 +829,13 @@ def : Pat<(i64 immConst2Part:$imm),
def : Pat<(i64 immSExt16:$imm),
(LDA immSExt16:$imm, R31)>;
def : Pat<(i64 immSExt16int:$imm),
(ZAPNOTi (LDA (SExtInt immSExt16int:$imm), R31), 15)>;
def : Pat<(i64 immConst2PartInt:$imm),
(ZAPNOTi (LDA (LL16 (SExtInt immConst2PartInt:$imm)),
(LDAH (LH16 (SExtInt immConst2PartInt:$imm)), R31)), 15)>;
//TODO: I want to just define these like this!
//def : Pat<(i64 0),
// (R31)>;