[PowerPC] Support absolute branches

There is currently only limited support for the "absolute" variants
of branch instructions.  This patch adds support for the absolute
variants of all branches that are currently otherwise supported.

This requires adding new fixup types so that the correct variant
of relocation type can be selected by the object writer.

While the compiler will continue to usually choose the relative
branch variants, this will allow the asm parser to fully support
the absolute branches, with either immediate (numerical) or
symbolic target addresses.

No change in code generation intended.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184721 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 7 insertions, 4 deletions

diff --git a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
index 432167e..9af5e53 100644
--- a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
+++ b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.cpp
@@ -148,11 +148,14 @@ void PPCInstPrinter::printBranchOperand(const MCInst *MI, unsigned OpNo,
   // Branches can take an immediate operand.  This is used by the branch
   // selection pass to print .+8, an eight byte displacement from the PC.
   O << ".+";
-  printAbsAddrOperand(MI, OpNo, O);
+  printAbsBranchOperand(MI, OpNo, O);
 }
 
-void PPCInstPrinter::printAbsAddrOperand(const MCInst *MI, unsigned OpNo,
-                                         raw_ostream &O) {
+void PPCInstPrinter::printAbsBranchOperand(const MCInst *MI, unsigned OpNo,
+                                           raw_ostream &O) {
+  if (!MI->getOperand(OpNo).isImm())
+    return printOperand(MI, OpNo, O);
+
   O << (int)MI->getOperand(OpNo).getImm()*4;
 }
 
diff --git a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
index f64a329..da09810 100644
--- a/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
+++ b/lib/Target/PowerPC/InstPrinter/PPCInstPrinter.h
@@ -51,7 +51,7 @@ public:
   void printS16ImmOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
   void printU16ImmOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
   void printBranchOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
-  void printAbsAddrOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
+  void printAbsBranchOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O);
 
   void printcrbitm(const MCInst *MI, unsigned OpNo, raw_ostream &O);