Add mcr* and mr*c support to thumb targets

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123917 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 68 insertions, 2 deletions

diff --git a/lib/Target/ARM/ARMInstrFormats.td b/lib/Target/ARM/ARMInstrFormats.td
index 54231a7..39c0ba8 100644
--- a/lib/Target/ARM/ARMInstrFormats.td
+++ b/lib/Target/ARM/ARMInstrFormats.td
@@ -801,6 +801,13 @@ class TIx2<bits<5> opcod1, bits<2> opcod2, bit opcod3,
   let Inst{12}    = opcod3;
 }
 
+// Move to/from coprocessor instructions
+class T1Cop<dag oops, dag iops, string asm, list<dag> pattern>
+  : ThumbI<oops, iops, AddrModeNone, Size4Bytes, NoItinerary, asm, "", pattern>,
+    Encoding, Requires<[IsThumb, HasV6]> {
+  let Inst{31-28} = 0b1110;
+}
+
 // BR_JT instructions
 class TJTI<dag oops, dag iops, InstrItinClass itin, string asm,
            list<dag> pattern>
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index 043254a..406d8db 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -1323,6 +1323,61 @@ def tLEApcrelJT : tPseudoInst<(outs tGPR:$Rd),
                               Size2Bytes, IIC_iALUi, []>;
 
 //===----------------------------------------------------------------------===//
+// Move between coprocessor and ARM core register -- for disassembly only
+//
+
+class tMovRCopro<string opc, bit direction>
+  : T1Cop<(outs), (ins p_imm:$cop, i32imm:$opc1,
+                       GPR:$Rt, c_imm:$CRn, c_imm:$CRm, i32imm:$opc2),
+          !strconcat(opc, "\t$cop, $opc1, $Rt, $CRn, $CRm, $opc2"),
+          [/* For disassembly only; pattern left blank */]> {
+  let Inst{27-24} = 0b1110;
+  let Inst{20} = direction;
+  let Inst{4} = 1;
+
+  bits<4> Rt;
+  bits<4> cop;
+  bits<3> opc1;
+  bits<3> opc2;
+  bits<4> CRm;
+  bits<4> CRn;
+
+  let Inst{15-12} = Rt;
+  let Inst{11-8}  = cop;
+  let Inst{23-21} = opc1;
+  let Inst{7-5}   = opc2;
+  let Inst{3-0}   = CRm;
+  let Inst{19-16} = CRn;
+}
+
+def tMCR : tMovRCopro<"mcr", 0 /* from ARM core register to coprocessor */>;
+def tMRC : tMovRCopro<"mrc", 1 /* from coprocessor to ARM core register */>;
+
+class tMovRRCopro<string opc, bit direction>
+  : T1Cop<(outs), (ins p_imm:$cop, i32imm:$opc1, GPR:$Rt, GPR:$Rt2, c_imm:$CRm),
+          !strconcat(opc, "\t$cop, $opc1, $Rt, $Rt2, $CRm"),
+          [/* For disassembly only; pattern left blank */]> {
+  let Inst{27-24} = 0b1100;
+  let Inst{23-21} = 0b010;
+  let Inst{20} = direction;
+
+  bits<4> Rt;
+  bits<4> Rt2;
+  bits<4> cop;
+  bits<4> opc1;
+  bits<4> CRm;
+
+  let Inst{15-12} = Rt;
+  let Inst{19-16} = Rt2;
+  let Inst{11-8}  = cop;
+  let Inst{7-4}   = opc1;
+  let Inst{3-0}   = CRm;
+}
+
+def tMCRR : tMovRRCopro<"mcrr", 0 /* from ARM core register to coprocessor */>;
+def tMRRC : tMovRRCopro<"mrrc", 1 /* from coprocessor to ARM core register */>;
+
+//===----------------------------------------------------------------------===//
 // TLS Instructions
 //
 
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 6a8b658..ba42b1e 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -1193,12 +1193,16 @@ GetMnemonicAcceptInfo(StringRef Mnemonic, bool &CanAcceptCarrySet,
       Mnemonic == "cps" || Mnemonic == "mcr2" || Mnemonic == "it" ||
       Mnemonic == "mcrr2" || Mnemonic == "cbz" || Mnemonic == "cdp2" ||
       Mnemonic == "trap" || Mnemonic == "mrc2" || Mnemonic == "mrrc2" ||
-      Mnemonic == "dsb" || Mnemonic == "movs" || Mnemonic == "isb" ||
-      (isThumb && Mnemonic == "bkpt")) {
+      Mnemonic == "dsb" || Mnemonic == "movs" || Mnemonic == "isb") {
     CanAcceptPredicationCode = false;
   } else {
     CanAcceptPredicationCode = true;
   }
+
+  if (isThumb)
+    if (Mnemonic == "bkpt" || Mnemonic == "mcr" || Mnemonic == "mcrr" ||
+        Mnemonic == "mrc" || Mnemonic == "mrrc")
+      CanAcceptPredicationCode = false;
 }
 
 /// Parse an arm instruction mnemonic followed by its operands.