Implement support for printing register and immediate operands,

add support for darwin vs aix syntax.  We now can print instructions
like this:

	add r3, r3, r4
	blr 

and (in aix mode):
	add 3, 3, 4
	blr 

llvm-svn: 119062

1 files changed, 36 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp b/llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
index adb93f2b7f4..767dc52b56c 100644
--- a/llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -13,9 +13,9 @@
 
 #define DEBUG_TYPE "asm-printer"
 #include "PPCInstPrinter.h"
+#include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
 //#include "llvm/MC/MCAsmInfo.h"
-//#include "llvm/MC/MCExpr.h"
 //#include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/raw_ostream.h"
 
@@ -39,3 +39,38 @@ void PPCInstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
   printInstruction(MI, O);
 }
 
+/// stripRegisterPrefix - This method strips the character prefix from a
+/// register name so that only the number is left.  Used by for linux asm.
+const char *stripRegisterPrefix(const char *RegName) {
+  switch (RegName[0]) {
+  case 'r':
+  case 'f':
+  case 'v': return RegName + 1;
+  case 'c': if (RegName[1] == 'r') return RegName + 2;
+  }
+  
+  return RegName;
+}
+
+void PPCInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
+                                  raw_ostream &O) {
+  const MCOperand &Op = MI->getOperand(OpNo);
+  if (Op.isReg()) {
+    const char *RegName = getRegisterName(Op.getReg());
+    // The linux and AIX assembler does not take register prefixes.
+    if (!isDarwinSyntax())
+      RegName = stripRegisterPrefix(RegName);
+    
+    O << RegName;
+    return;
+  }
+  
+  if (Op.isImm()) {
+    O << Op.getImm();
+    return;
+  }
+  
+  assert(Op.isExpr() && "unknown operand kind in printOperand");
+  O << *Op.getExpr();
+}
+