[mips] Fold FeatureSwap into FeatureMips32r2 and FeatureMips64r2

Summary:
dsbh and dshd are not available on Mips32r2. No codegen test changes
required since expansion of i64 prevented the use of these instructions
anyway.

Depends on D3690

Reviewers: vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D3692

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208542 91177308-0d34-0410-b5e6-96231b3b80d8

8 files changed, 24 insertions, 23 deletions

diff --git a/lib/Target/Mips/MicroMipsInstrInfo.td b/lib/Target/Mips/MicroMipsInstrInfo.td
index e8015fd062..ffe9376d4d 100644
--- a/lib/Target/Mips/MicroMipsInstrInfo.td
+++ b/lib/Target/Mips/MicroMipsInstrInfo.td
@@ -226,7 +226,8 @@ let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
   def SEH_MM : MMRel, SignExtInReg<"seh", i16, GPR32Opnd, II_SEH>, SEB_FM_MM<0x0ec>;
 
   /// Word Swap Bytes Within Halfwords
-  def WSBH_MM : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM_MM<0x1ec>;
+  def WSBH_MM : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM_MM<0x1ec>,
+                ISA_MIPS32R2;
 
   def EXT_MM : MMRel, ExtBase<"ext", GPR32Opnd, uimm5, MipsExt>,
                EXT_FM_MM<0x2c>;
diff --git a/lib/Target/Mips/Mips.td b/lib/Target/Mips/Mips.td
index 40f5b938e2..6fe7d26c45 100644
--- a/lib/Target/Mips/Mips.td
+++ b/lib/Target/Mips/Mips.td
@@ -77,8 +77,6 @@ def FeatureVFPU        : SubtargetFeature<"vfpu", "HasVFPU",
                                 "true", "Enable vector FPU instructions.">;
 def FeatureSEInReg     : SubtargetFeature<"seinreg", "HasSEInReg", "true",
                                 "Enable 'signext in register' instructions.">;
-def FeatureSwap        : SubtargetFeature<"swap", "HasSwap", "true",
-                                "Enable 'byte/half swap' instructions.">;
 def FeatureBitCount    : SubtargetFeature<"bitcount", "HasBitCount", "true",
                                 "Enable 'count leading bits' instructions.">;
 def FeatureMips1       : SubtargetFeature<"mips1", "MipsArchVersion", "Mips1",
@@ -113,7 +111,7 @@ def FeatureMips32      : SubtargetFeature<"mips32", "MipsArchVersion", "Mips32",
 def FeatureMips32r2    : SubtargetFeature<"mips32r2", "MipsArchVersion",
                                 "Mips32r2", "Mips32r2 ISA Support",
                                 [FeatureMips4_32r2, FeatureMips32,
-                                 FeatureSEInReg, FeatureSwap]>;
+                                 FeatureSEInReg]>;
 def FeatureMips32r6    : SubtargetFeature<"mips32r6", "MipsArchVersion",
                                 "Mips32r6",
                                 "Mips32r6 ISA Support [experimental]",
diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 96989cffbe..fd8a92729b 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -218,8 +218,8 @@ def DCLZ : CountLeading0<"dclz", GPR64Opnd>, CLO_FM<0x24>;
 def DCLO : CountLeading1<"dclo", GPR64Opnd>, CLO_FM<0x25>;
 
 /// Double Word Swap Bytes/HalfWords
-def DSBH : SubwordSwap<"dsbh", GPR64Opnd>, SEB_FM<2, 0x24>;
-def DSHD : SubwordSwap<"dshd", GPR64Opnd>, SEB_FM<5, 0x24>;
+def DSBH : SubwordSwap<"dsbh", GPR64Opnd>, SEB_FM<2, 0x24>, ISA_MIPS64R2;
+def DSHD : SubwordSwap<"dshd", GPR64Opnd>, SEB_FM<5, 0x24>, ISA_MIPS64R2;
 
 def LEA_ADDiu64 : EffectiveAddress<"daddiu", GPR64Opnd>, LW_FM<0x19>;
 
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index ddcbb60ba9..92bbd65e23 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -362,10 +362,10 @@ MipsTargetLowering::MipsTargetLowering(MipsTargetMachine &TM)
     setOperationAction(ISD::CTLZ, MVT::i64, Expand);
   }
 
-  if (!Subtarget->hasSwap()) {
+  if (!Subtarget->hasMips32r2())
     setOperationAction(ISD::BSWAP, MVT::i32, Expand);
+  if (!Subtarget->hasMips64r2())
     setOperationAction(ISD::BSWAP, MVT::i64, Expand);
-  }
 
   if (isGP64bit()) {
     setLoadExtAction(ISD::SEXTLOAD, MVT::i32, Custom);
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index 9a3945a7f7..12ebb0c141 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -150,8 +150,6 @@ def HasSEInReg  :     Predicate<"Subtarget.hasSEInReg()">,
                       AssemblerPredicate<"FeatureSEInReg">;
 def HasBitCount :     Predicate<"Subtarget.hasBitCount()">,
                       AssemblerPredicate<"FeatureBitCount">;
-def HasSwap     :     Predicate<"Subtarget.hasSwap()">,
-                      AssemblerPredicate<"FeatureSwap">;
 def HasMips2     :    Predicate<"Subtarget.hasMips2()">,
                       AssemblerPredicate<"FeatureMips2">;
 def HasMips3_32  :    Predicate<"Subtarget.hasMips3_32()">,
@@ -226,7 +224,6 @@ class INSN_MIPS4_32 { list<Predicate> InsnPredicates = [HasMips4_32]; }
 // The portions of MIPS-IV that were also added to MIPS32R2
 class INSN_MIPS4_32R2 { list<Predicate> InsnPredicates = [HasMips4_32r2]; }
 
-class INSN_SWAP { list<Predicate> InsnPredicates = [HasSwap]; }
 class INSN_SEINREG { list<Predicate> InsnPredicates = [HasSEInReg]; }
 
 //===----------------------------------------------------------------------===//
@@ -848,7 +845,7 @@ class SignExtInReg<string opstr, ValueType vt, RegisterOperand RO,
 // Subword Swap
 class SubwordSwap<string opstr, RegisterOperand RO>:
   InstSE<(outs RO:$rd), (ins RO:$rt), !strconcat(opstr, "\t$rd, $rt"), [],
-         NoItinerary, FrmR, opstr>, INSN_SWAP {
+         NoItinerary, FrmR, opstr> {
   let neverHasSideEffects = 1;
 }
 
@@ -1176,7 +1173,7 @@ def CLZ : MMRel, CountLeading0<"clz", GPR32Opnd>, CLO_FM<0x20>;
 def CLO : MMRel, CountLeading1<"clo", GPR32Opnd>, CLO_FM<0x21>;
 
 /// Word Swap Bytes Within Halfwords
-def WSBH : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM<2, 0x20>;
+def WSBH : MMRel, SubwordSwap<"wsbh", GPR32Opnd>, SEB_FM<2, 0x20>, ISA_MIPS32R2;
 
 /// No operation.
 def NOP : PseudoSE<(outs), (ins), []>, PseudoInstExpansion<(SLL ZERO, ZERO, 0)>;
diff --git a/lib/Target/Mips/MipsSubtarget.cpp b/lib/Target/Mips/MipsSubtarget.cpp
index b19ef65264..1913d895b7 100644
--- a/lib/Target/Mips/MipsSubtarget.cpp
+++ b/lib/Target/Mips/MipsSubtarget.cpp
@@ -81,12 +81,11 @@ MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
       MipsABI(UnknownABI), IsLittle(little), IsSingleFloat(false),
       IsFP64bit(false), IsNaN2008bit(false), IsGP64bit(false), HasVFPU(false),
       HasCnMips(false), IsLinux(true), HasMips3_32(false), HasMips4_32(false),
-      HasMips4_32r2(false), HasSEInReg(false), HasSwap(false),
-      HasBitCount(false), InMips16Mode(false),
-      InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
-      HasDSPR2(false), AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
-      HasMSA(false), RM(_RM), OverrideMode(NoOverride), TM(_TM),
-      TargetTriple(TT) {
+      HasMips4_32r2(false), HasSEInReg(false), HasBitCount(false),
+      InMips16Mode(false), InMips16HardFloat(Mips16HardFloat),
+      InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
+      AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16), HasMSA(false),
+      RM(_RM), OverrideMode(NoOverride), TM(_TM), TargetTriple(TT) {
   std::string CPUName = CPU;
   CPUName = selectMipsCPU(TT, CPUName);
 
diff --git a/lib/Target/Mips/MipsSubtarget.h b/lib/Target/Mips/MipsSubtarget.h
index aa69110e44..dba4aede2e 100644
--- a/lib/Target/Mips/MipsSubtarget.h
+++ b/lib/Target/Mips/MipsSubtarget.h
@@ -91,9 +91,6 @@ protected:
   // HasSEInReg - SEB and SEH (signext in register) instructions.
   bool HasSEInReg;
 
-  // HasSwap - Byte and half swap instructions.
-  bool HasSwap;
-
   // HasBitCount - Count leading '1' and '0' bits.
   bool HasBitCount;
 
@@ -215,7 +212,6 @@ public:
 
   /// Features related to the presence of specific instructions.
   bool hasSEInReg()   const { return HasSEInReg; }
-  bool hasSwap()      const { return HasSwap; }
   bool hasBitCount()  const { return HasBitCount; }
   bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); }
 
diff --git a/test/MC/Mips/mips32r2/invalid-mips64r2.s b/test/MC/Mips/mips32r2/invalid-mips64r2.s
new file mode 100644
index 0000000000..293e58eaed
--- /dev/null
+++ b/test/MC/Mips/mips32r2/invalid-mips64r2.s
@@ -0,0 +1,10 @@
+# Instructions that are invalid
+#
+# RUN: not llvm-mc %s -triple=mips64-unknown-linux -show-encoding \
+# RUN:     -mcpu=mips32r2 2>%t1
+# RUN: FileCheck %s < %t1
+
+	.set noat
+	dsbh	$v1,$t6    # CHECK: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
+	dshd	$v0,$sp    # CHECK: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
+