Behold, rlwinm with certain immediate arguments is printed as the much more
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
diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 025ce98..3006f62 100644
--- a/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -397,6 +397,28 @@
///
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