6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

aesthetic changes, no functionality change. Evan, it's not clear

Browse Source 
what 'Available' is, please add a comment near it and rename it
if appropriate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44703 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-12-08 07:22:58 +00:00
parent 320c630c1b
commit 5aaddaa7b8
1 changed files with 40 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
lib/Target/X86/X86ISelDAGToDAG.cpp
View File

@ -562,7 +562,7 @@ void X86DAGToDAGISel::EmitFunctionEntryCode(Function &Fn, MachineFunction &MF) {
/// MatchAddress - Add the specified node to the specified addressing mode,
/// returning true if it cannot be done. This just pattern matches for the
/// addressing mode
/// addressing mode.
bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
bool isRoot, unsigned Depth) {
// Limit recursion.
@ -653,33 +653,35 @@ bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
break;
case ISD::SHL:
if (!Available && AM.IndexReg.Val == 0 && AM.Scale == 1)
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.Val->getOperand(1))) {
unsigned Val = CN->getValue();
if (Val == 1 || Val == 2 || Val == 3) {
AM.Scale = 1 << Val;
SDOperand ShVal = N.Val->getOperand(0);
if (Available || AM.IndexReg.Val != 0 || AM.Scale != 1)
break;
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.Val->getOperand(1))) {
unsigned Val = CN->getValue();
if (Val == 1 || Val == 2 || Val == 3) {
AM.Scale = 1 << Val;
SDOperand ShVal = N.Val->getOperand(0);
// Okay, we know that we have a scale by now. However, if the scaled
// value is an add of something and a constant, we can fold the
// constant into the disp field here.
if (ShVal.Val->getOpcode() == ISD::ADD && ShVal.hasOneUse() &&
isa<ConstantSDNode>(ShVal.Val->getOperand(1))) {
AM.IndexReg = ShVal.Val->getOperand(0);
ConstantSDNode *AddVal =
cast<ConstantSDNode>(ShVal.Val->getOperand(1));
uint64_t Disp = AM.Disp + (AddVal->getValue() << Val);
if (isInt32(Disp))
AM.Disp = Disp;
else
AM.IndexReg = ShVal;
} else {
// Okay, we know that we have a scale by now. However, if the scaled
// value is an add of something and a constant, we can fold the
// constant into the disp field here.
if (ShVal.Val->getOpcode() == ISD::ADD && ShVal.hasOneUse() &&
isa<ConstantSDNode>(ShVal.Val->getOperand(1))) {
AM.IndexReg = ShVal.Val->getOperand(0);
ConstantSDNode *AddVal =
cast<ConstantSDNode>(ShVal.Val->getOperand(1));
uint64_t Disp = AM.Disp + (AddVal->getValue() << Val);
if (isInt32(Disp))
AM.Disp = Disp;
else
AM.IndexReg = ShVal;
}
return false;
} else {
AM.IndexReg = ShVal;
}
return false;
}
break;
}
case ISD::SMUL_LOHI:
case ISD::UMUL_LOHI:
@ -738,22 +740,22 @@ bool X86DAGToDAGISel::MatchAddress(SDOperand N, X86ISelAddressMode &AM,
case ISD::OR:
// Handle "X | C" as "X + C" iff X is known to have C bits clear.
if (!Available) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
X86ISelAddressMode Backup = AM;
// Start with the LHS as an addr mode.
if (!MatchAddress(N.getOperand(0), AM, false) &&
// Address could not have picked a GV address for the displacement.
AM.GV == NULL &&
// On x86-64, the resultant disp must fit in 32-bits.
isInt32(AM.Disp + CN->getSignExtended()) &&
// Check to see if the LHS & C is zero.
CurDAG->MaskedValueIsZero(N.getOperand(0), CN->getValue())) {
AM.Disp += CN->getValue();
return false;
}
AM = Backup;
if (Available) break;
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
X86ISelAddressMode Backup = AM;
// Start with the LHS as an addr mode.
if (!MatchAddress(N.getOperand(0), AM, false) &&
// Address could not have picked a GV address for the displacement.
AM.GV == NULL &&
// On x86-64, the resultant disp must fit in 32-bits.
isInt32(AM.Disp + CN->getSignExtended()) &&
// Check to see if the LHS & C is zero.
CurDAG->MaskedValueIsZero(N.getOperand(0), CN->getValue())) {
AM.Disp += CN->getValue();
return false;
}
AM = Backup;
}
break;
}