LDCL_POST and STCL_POST need one's-complement offsets, rather than two's complement offsets. Add an appropriate immediate type for them.

llvm-svn: 136896

3 files changed, 23 insertions, 1 deletions

diff --git a/llvm/lib/Target/ARM/ARMInstrInfo.td b/llvm/lib/Target/ARM/ARMInstrInfo.td
index f03aced9cb7..9fac575c1db 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.td
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.td
@@ -626,6 +626,17 @@ def postidx_imm8 : Operand<i32> {
   let MIOperandInfo = (ops i32imm);
 }
 
+// postidx_imm8s4 := +/- [0,1020]
+//
+// 9 bit value:
+//  {8}       1 is imm8 is non-negative. 0 otherwise.
+//  {7-0}     [0,255] imm8 value, scaled by 4.
+def postidx_imm8s4 : Operand<i32> {
+  let PrintMethod = "printPostIdxImm8s4Operand";
+  let MIOperandInfo = (ops i32imm);
+}
+
+
 // postidx_reg := +/- reg
 //
 def PostIdxRegAsmOperand : AsmOperandClass {
@@ -3974,7 +3985,7 @@ multiclass LdStCop<bits<4> op31_28, bit load, dag ops, string opc, string cond>{
 
   def L_POST : ACI<(outs),
       !con((ins nohash_imm:$cop, nohash_imm:$CRd, addr_offset_none:$addr,
-            i32imm:$offset), ops),
+            postidx_imm8s4:$offset), ops),
       !strconcat(!strconcat(opc, "l"), cond), "\tp$cop, cr$CRd, $addr, $offset",
       IndexModePost> {
     let Inst{31-28} = op31_28;
diff --git a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index 2394340e602..37359cec7fa 100644
--- a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -382,6 +382,15 @@ void ARMInstPrinter::printPostIdxImm8Operand(const MCInst *MI,
   O << '#' << ((Imm & 256) ? "" : "-") << (Imm & 0xff);
 }
 
+void ARMInstPrinter::printPostIdxImm8s4Operand(const MCInst *MI,
+                                             unsigned OpNum,
+                                             raw_ostream &O) {
+  const MCOperand &MO = MI->getOperand(OpNum);
+  unsigned Imm = MO.getImm();
+  O << '#' << ((Imm & 256) ? "" : "-") << ((Imm & 0xff) << 2);
+}
+
+
 void ARMInstPrinter::printLdStmModeOperand(const MCInst *MI, unsigned OpNum,
                                            raw_ostream &O) {
   ARM_AM::AMSubMode Mode = ARM_AM::getAM4SubMode(MI->getOperand(OpNum)
diff --git a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.h b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
index 9f481e91289..ac78d028359 100644
--- a/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
+++ b/llvm/lib/Target/ARM/InstPrinter/ARMInstPrinter.h
@@ -55,6 +55,8 @@ public:
   void printAM3PreOrOffsetIndexOp(const MCInst *MI, unsigned Op,raw_ostream &O);
   void printPostIdxImm8Operand(const MCInst *MI, unsigned OpNum,
                                raw_ostream &O);
+  void printPostIdxImm8s4Operand(const MCInst *MI, unsigned OpNum,
+                               raw_ostream &O);
 
   void printLdStmModeOperand(const MCInst *MI, unsigned OpNum, raw_ostream &O);
   void printAddrMode5Operand(const MCInst *MI, unsigned OpNum, raw_ostream &O);