[ARM] Introduce the 'sevl' instruction in ARMv8.

This also removes the restriction on the immediate field of the 'hint'
instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191744 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 22 insertions, 29 deletions

diff --git a/lib/Target/ARM/ARMInstrInfo.td b/lib/Target/ARM/ARMInstrInfo.td
index 59d2f7a..740b71c 100644
--- a/lib/Target/ARM/ARMInstrInfo.td
+++ b/lib/Target/ARM/ARMInstrInfo.td
@@ -594,17 +594,6 @@ def imm0_1 : Operand<i32> { let ParserMatchClass = Imm0_1AsmOperand; }
 def Imm0_3AsmOperand: ImmAsmOperand { let Name = "Imm0_3"; }
 def imm0_3 : Operand<i32> { let ParserMatchClass = Imm0_3AsmOperand; }
 
-/// imm0_4 predicate - Immediate in the range [0,4].
-def Imm0_4AsmOperand : ImmAsmOperand
-{ 
-  let Name = "Imm0_4"; 
-  let DiagnosticType = "ImmRange0_4";  
-}
-def imm0_4 : Operand<i32>, ImmLeaf<i32, [{ return Imm >= 0 && Imm < 5; }]> {
-  let ParserMatchClass = Imm0_4AsmOperand;
-  let DecoderMethod = "DecodeImm0_4";
-}
-
 /// imm0_7 predicate - Immediate in the range [0,7].
 def Imm0_7AsmOperand: ImmAsmOperand { let Name = "Imm0_7"; }
 def imm0_7 : Operand<i32>, ImmLeaf<i32, [{
@@ -1677,11 +1666,11 @@ PseudoInst<(outs), (ins i32imm:$amt, pred:$p), NoItinerary,
            [(ARMcallseq_start timm:$amt)]>;
 }
 
-def HINT : AI<(outs), (ins imm0_4:$imm), MiscFrm, NoItinerary,
+def HINT : AI<(outs), (ins imm0_255:$imm), MiscFrm, NoItinerary,
               "hint", "\t$imm", []>, Requires<[IsARM, HasV6]> {
-  bits<3> imm;
-  let Inst{27-3} = 0b0011001000001111000000000;
-  let Inst{2-0} = imm;
+  bits<8> imm;
+  let Inst{27-8} = 0b00110010000011110000;
+  let Inst{7-0} = imm;
 }
 
 def : InstAlias<"nop$p", (HINT 0, pred:$p)>, Requires<[IsARM, HasV6T2]>;
@@ -1689,6 +1678,9 @@ def : InstAlias<"yield$p", (HINT 1, pred:$p)>, Requires<[IsARM, HasV6T2]>;
 def : InstAlias<"wfe$p", (HINT 2, pred:$p)>, Requires<[IsARM, HasV6T2]>;
 def : InstAlias<"wfi$p", (HINT 3, pred:$p)>, Requires<[IsARM, HasV6T2]>;
 def : InstAlias<"sev$p", (HINT 4, pred:$p)>, Requires<[IsARM, HasV6T2]>;
+def : InstAlias<"sevl$p", (HINT 5, pred:$p)>, Requires<[IsARM, HasV8]>;
+
+def : Pat<(int_arm_sevl), (HINT 5)>;
 
 def SEL : AI<(outs GPR:$Rd), (ins GPR:$Rn, GPR:$Rm), DPFrm, NoItinerary, "sel",
              "\t$Rd, $Rn, $Rm", []>, Requires<[IsARM, HasV6]> {
diff --git a/lib/Target/ARM/ARMInstrThumb.td b/lib/Target/ARM/ARMInstrThumb.td
index dd5f2cf..2c54791 100644
--- a/lib/Target/ARM/ARMInstrThumb.td
+++ b/lib/Target/ARM/ARMInstrThumb.td
@@ -289,6 +289,11 @@ def tSEV : T1pI<(outs), (ins), NoItinerary, "sev", "", []>,
            T1SystemEncoding<0x40>, // A8.6.157
            Requires<[IsThumb2]>;
 
+def tSEVL : T1pI<(outs), (ins), NoItinerary, "sevl", "", [(int_arm_sevl)]>,
+            T1SystemEncoding<0x50>,
+            Requires<[IsThumb2, HasV8]>;
+
+
 // The imm operand $val can be used by a debugger to store more information
 // about the breakpoint.
 def tBKPT : T1I<(outs), (ins imm0_255:$val), NoItinerary, "bkpt\t$val",
diff --git a/lib/Target/ARM/ARMInstrThumb2.td b/lib/Target/ARM/ARMInstrThumb2.td
index 07baf2d..7549700 100644
--- a/lib/Target/ARM/ARMInstrThumb2.td
+++ b/lib/Target/ARM/ARMInstrThumb2.td
@@ -3652,18 +3652,21 @@ def : t2InstAlias<"cps.w $mode", (t2CPS1p imm0_31:$mode), 0>;
 
 // A6.3.4 Branches and miscellaneous control
 // Table A6-14 Change Processor State, and hint instructions
-def t2HINT : T2I<(outs), (ins imm0_4:$imm), NoItinerary, "hint", "\t$imm",[]> {
+def t2HINT : T2I<(outs), (ins imm0_255:$imm), NoItinerary, "hint", "\t$imm",[]> {
   bits<3> imm;
   let Inst{31-3} = 0b11110011101011111000000000000;
   let Inst{2-0} = imm;
 }
 
-def : t2InstAlias<"hint$p.w $imm", (t2HINT imm0_4:$imm, pred:$p)>;
+def : t2InstAlias<"hint$p.w $imm", (t2HINT imm0_255:$imm, pred:$p)>;
 def : t2InstAlias<"nop$p.w", (t2HINT 0, pred:$p)>;
 def : t2InstAlias<"yield$p.w", (t2HINT 1, pred:$p)>;
 def : t2InstAlias<"wfe$p.w", (t2HINT 2, pred:$p)>;
 def : t2InstAlias<"wfi$p.w", (t2HINT 3, pred:$p)>;
 def : t2InstAlias<"sev$p.w", (t2HINT 4, pred:$p)>;
+def : t2InstAlias<"sevl$p.w", (t2HINT 5, pred:$p)> {
+  let Predicates = [IsThumb2, HasV8];
+}
 
 def t2DBG : T2I<(outs), (ins imm0_15:$opt), NoItinerary, "dbg", "\t$opt", []> {
   bits<4> opt;
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 4faf3b3..ebc382c 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -679,13 +679,6 @@ public:
     int64_t Value = CE->getValue();
     return ((Value & 3) == 0) && Value >= -1020 && Value <= 1020;
   }
-  bool isImm0_4() const {
-    if (!isImm()) return false;
-    const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
-    if (!CE) return false;
-    int64_t Value = CE->getValue();
-    return Value >= 0 && Value < 5;
-  }
   bool isImm0_1020s4() const {
     if (!isImm()) return false;
     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(getImm());
@@ -7687,11 +7680,6 @@ MatchAndEmitInstruction(SMLoc IDLoc, unsigned &Opcode,
     return Error(IDLoc, "instruction variant requires ARMv6 or later");
   case Match_RequiresThumb2:
     return Error(IDLoc, "instruction variant requires Thumb2");
-  case Match_ImmRange0_4: {
-    SMLoc ErrorLoc = ((ARMOperand*)Operands[ErrorInfo])->getStartLoc();
-    if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
-    return Error(ErrorLoc, "immediate operand must be in the range [0,4]");
-  }
   case Match_ImmRange0_15: {
     SMLoc ErrorLoc = ((ARMOperand*)Operands[ErrorInfo])->getStartLoc();
     if (ErrorLoc == SMLoc()) ErrorLoc = IDLoc;
diff --git a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
index 82c1294..efa8306 100644
--- a/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
+++ b/lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
@@ -84,6 +84,11 @@ void ARMInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
     case 2: O << "\twfe"; break;
     case 3: O << "\twfi"; break;
     case 4: O << "\tsev"; break;
+    case 5:
+      if ((getAvailableFeatures() & ARM::HasV8Ops)) {
+        O << "\tsevl";
+        break;
+      } // Fallthrough for non-v8
     default:
       // Anything else should just print normally.
       printInstruction(MI, O);