[PowerPC] Fix hi/lo encoding in old-style code emitter

This patch implements the equivalent change to r182091/r182092
in the old-style code emitter.  Instead of having two separate
16-bit immediate encoding routines depending on the instruction,
this patch introduces a single encoder that checks the machine
operand flags to decide whether the low or high half of a
symbol address is required.

Since now both encoders make no further distinction between
"symbolLo" and "symbolHi", the .td operand can now use a
single getS16ImmEncoding method.

Tested by running the old-style JIT tests on 32-bit Linux.

llvm-svn: 182097

4 files changed, 17 insertions, 33 deletions

diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
index 34bd483ee0f..31c73aeff56 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
@@ -48,10 +48,8 @@ public:
                                SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned getCondBrEncoding(const MCInst &MI, unsigned OpNo,
                              SmallVectorImpl<MCFixup> &Fixups) const;
-  unsigned getHA16Encoding(const MCInst &MI, unsigned OpNo,
-                           SmallVectorImpl<MCFixup> &Fixups) const;
-  unsigned getLO16Encoding(const MCInst &MI, unsigned OpNo,
-                           SmallVectorImpl<MCFixup> &Fixups) const;
+  unsigned getS16ImmEncoding(const MCInst &MI, unsigned OpNo,
+                             SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned getMemRIEncoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups) const;
   unsigned getMemRIXEncoding(const MCInst &MI, unsigned OpNo,
@@ -136,18 +134,7 @@ unsigned PPCMCCodeEmitter::getCondBrEncoding(const MCInst &MI, unsigned OpNo,
   return 0;
 }
 
-unsigned PPCMCCodeEmitter::getHA16Encoding(const MCInst &MI, unsigned OpNo,
-                                       SmallVectorImpl<MCFixup> &Fixups) const {
-  const MCOperand &MO = MI.getOperand(OpNo);
-  if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups);
-  
-  // Add a fixup for the branch target.
-  Fixups.push_back(MCFixup::Create(2, MO.getExpr(),
-                                   (MCFixupKind)PPC::fixup_ppc_half16));
-  return 0;
-}
-
-unsigned PPCMCCodeEmitter::getLO16Encoding(const MCInst &MI, unsigned OpNo,
+unsigned PPCMCCodeEmitter::getS16ImmEncoding(const MCInst &MI, unsigned OpNo,
                                        SmallVectorImpl<MCFixup> &Fixups) const {
   const MCOperand &MO = MI.getOperand(OpNo);
   if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO, Fixups);
diff --git a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
index 14f9ff64d23..40e4968bb4c 100644
--- a/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -64,8 +64,7 @@ namespace {
     unsigned getDirectBrEncoding(const MachineInstr &MI, unsigned OpNo) const;
     unsigned getCondBrEncoding(const MachineInstr &MI, unsigned OpNo) const;
 
-    unsigned getHA16Encoding(const MachineInstr &MI, unsigned OpNo) const;
-    unsigned getLO16Encoding(const MachineInstr &MI, unsigned OpNo) const;
+    unsigned getS16ImmEncoding(const MachineInstr &MI, unsigned OpNo) const;
     unsigned getMemRIEncoding(const MachineInstr &MI, unsigned OpNo) const;
     unsigned getMemRIXEncoding(const MachineInstr &MI, unsigned OpNo) const;
     unsigned getTLSRegEncoding(const MachineInstr &MI, unsigned OpNo) const;
@@ -194,21 +193,19 @@ unsigned PPCCodeEmitter::getCondBrEncoding(const MachineInstr &MI,
   return 0;
 }
 
-unsigned PPCCodeEmitter::getHA16Encoding(const MachineInstr &MI,
-                                         unsigned OpNo) const {
+unsigned PPCCodeEmitter::getS16ImmEncoding(const MachineInstr &MI,
+                                           unsigned OpNo) const {
   const MachineOperand &MO = MI.getOperand(OpNo);
   if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO);
 
-  MCE.addRelocation(GetRelocation(MO, PPC::reloc_absolute_high));
-  return 0;
-}
+  unsigned RelocID;
+  switch (MO.getTargetFlags() & PPCII::MO_ACCESS_MASK) {
+    default: llvm_unreachable("Unsupported target operand flags!");
+    case PPCII::MO_HA16: RelocID = PPC::reloc_absolute_high; break;
+    case PPCII::MO_LO16: RelocID = PPC::reloc_absolute_low; break;
+  }
 
-unsigned PPCCodeEmitter::getLO16Encoding(const MachineInstr &MI,
-                                         unsigned OpNo) const {
-  const MachineOperand &MO = MI.getOperand(OpNo);
-  if (MO.isReg() || MO.isImm()) return getMachineOpValue(MI, MO);
-  
-  MCE.addRelocation(GetRelocation(MO, PPC::reloc_absolute_low));
+  MCE.addRelocation(GetRelocation(MO, RelocID));
   return 0;
 }
 
diff --git a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
index 4b3c22d7cf1..c1071b19769 100644
--- a/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
+++ b/llvm/lib/Target/PowerPC/PPCInstr64Bit.td
@@ -25,12 +25,12 @@ def u16imm64 : Operand<i64> {
 }
 def symbolHi64 : Operand<i64> {
   let PrintMethod = "printSymbolHi";
-  let EncoderMethod = "getHA16Encoding";
+  let EncoderMethod = "getS16ImmEncoding";
   let ParserMatchClass = PPCS16ImmAsmOperand;
 }
 def symbolLo64 : Operand<i64> {
   let PrintMethod = "printSymbolLo";
-  let EncoderMethod = "getLO16Encoding";
+  let EncoderMethod = "getS16ImmEncoding";
   let ParserMatchClass = PPCS16ImmAsmOperand;
 }
 def tocentry : Operand<iPTR> {
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.td b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
index e87fa8f3427..16a102f6a2c 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
@@ -458,12 +458,12 @@ def aaddr : Operand<iPTR> {
 }
 def symbolHi: Operand<i32> {
   let PrintMethod = "printSymbolHi";
-  let EncoderMethod = "getHA16Encoding";
+  let EncoderMethod = "getS16ImmEncoding";
   let ParserMatchClass = PPCS16ImmAsmOperand;
 }
 def symbolLo: Operand<i32> {
   let PrintMethod = "printSymbolLo";
-  let EncoderMethod = "getLO16Encoding";
+  let EncoderMethod = "getS16ImmEncoding";
   let ParserMatchClass = PPCS16ImmAsmOperand;
 }
 def PPCCRBitMaskOperand : AsmOperandClass {