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Behold, rlwinm with certain immediate arguments is printed as the much more

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readable slwi or srwi (shift left/right word immediate).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21099 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-04-05 18:19:50 +00:00
parent a3829d5580
commit ad5f65c74b
1 changed files with 22 additions and 0 deletions
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22
lib/Target/PowerPC/PPCAsmPrinter.cpp
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@ -397,6 +397,28 @@ void PowerPCAsmPrinter::printOp(const MachineOperand &MO, bool IsCallOp) {
///
void PowerPCAsmPrinter::printMachineInstruction(const MachineInstr *MI) {
++EmittedInsts;
// Check for slwi/srwi mnemonics.
if (MI->getOpcode() == PPC::RLWINM) {
bool FoundMnemonic = false;
unsigned char SH = MI->getOperand(2).getImmedValue();
unsigned char MB = MI->getOperand(3).getImmedValue();
unsigned char ME = MI->getOperand(4).getImmedValue();
if (SH <= 31 && MB == 0 && ME == (31-SH)) {
O << "slwi "; FoundMnemonic = true;
}
if (SH <= 31 && MB == (32-SH) && ME == 31) {
O << "srwi "; FoundMnemonic = true;
SH = 32-SH;
}
if (FoundMnemonic) {
printOperand(MI, 0, MVT::i64);
O << ", ";
printOperand(MI, 1, MVT::i64);
O << ", " << (unsigned int)SH << "\n";
return;
}
}
if (printInstruction(MI))
return; // Printer was automatically generated