[mips][mips64r6] [ls][wd]c2 were re-encoded with 11-bit signed immediates rather than 16-bit in MIPS32r6/MIPS64r6

Summary:
The error message for the invalid.s cases isn't very helpful. It happens because
there is an instruction with a wider immediate that would have matched if the
NotMips32r6 predicate were true. I have some WIP to improve the message but it
affects most error messages for removed/re-encoded instructions on
MIPS32r6/MIPS64r6 and should therefore be a separate commit.

Depens on D4115

Reviewers: zoran.jovanovic, jkolek, vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D4117

llvm-svn: 211012

18 files changed, 140 insertions, 47 deletions

diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
index c9deae6afb2..b3018c96029 100644
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -620,6 +620,12 @@ public:
     return Kind == k_Token;
   }
   bool isMem() const override { return Kind == k_Memory; }
+  bool isConstantMemOff() const {
+    return isMem() && dyn_cast<MCConstantExpr>(getMemOff());
+  }
+  template <unsigned Bits> bool isMemWithSimmOffset() const {
+    return isMem() && isConstantMemOff() && isInt<Bits>(getConstantMemOff());
+  }
   bool isInvNum() const { return Kind == k_Immediate; }
   bool isLSAImm() const {
     if (!isConstantImm())
@@ -664,6 +670,10 @@ public:
     return Mem.Off;
   }
 
+  int64_t getConstantMemOff() const {
+    return static_cast<const MCConstantExpr *>(getMemOff())->getValue();
+  }
+
   static std::unique_ptr<MipsOperand> CreateToken(StringRef Str, SMLoc S,
                                                   MipsAsmParser &Parser) {
     auto Op = make_unique<MipsOperand>(k_Token, Parser);
diff --git a/llvm/lib/Target/Mips/Mips32r6InstrFormats.td b/llvm/lib/Target/Mips/Mips32r6InstrFormats.td
index 433580b051d..6eb8c4650cd 100644
--- a/llvm/lib/Target/Mips/Mips32r6InstrFormats.td
+++ b/llvm/lib/Target/Mips/Mips32r6InstrFormats.td
@@ -40,6 +40,8 @@ def OPGROUP_PCREL    : OPGROUP<0b111011>;
 def OPGROUP_REGIMM   : OPGROUP<0b000001>;
 def OPGROUP_SPECIAL  : OPGROUP<0b000000>;
 def OPGROUP_SPECIAL3 : OPGROUP<0b011111>;
+// The spec names this constant LWC2, LDC2, SWC2, and SDC2 in different places.
+def OPGROUP_COP2LDST : OPGROUP<0b010010>;
 
 class OPCODE2<bits<2> Val> {
   bits<2> Value = Val;
@@ -65,6 +67,12 @@ def OPCODE5_BC1NEZ : OPCODE5<0b01101>;
 def OPCODE5_BC2EQZ : OPCODE5<0b01001>;
 def OPCODE5_BC2NEZ : OPCODE5<0b01101>;
 def OPCODE5_BGEZAL : OPCODE5<0b10001>;
+// The next four constants are unnamed in the spec. These names are taken from
+// the OPGROUP names they are used with.
+def OPCODE5_LDC2   : OPCODE5<0b01110>;
+def OPCODE5_LWC2   : OPCODE5<0b01010>;
+def OPCODE5_SDC2   : OPCODE5<0b01111>;
+def OPCODE5_SWC2   : OPCODE5<0b01011>;
 
 class OPCODE6<bits<6> Val> {
   bits<6> Value = Val;
@@ -445,3 +453,18 @@ class JR_HB_R6_FM<OPCODE6 Operation> : MipsR6Inst {
   let Inst{9-6} = 0;
   let Inst{5-0} = Operation.Value;
 }
+
+class COP2LDST_FM<OPCODE5 Operation> : MipsR6Inst {
+  bits<5> rt;
+  bits<21> addr;
+  bits<5> base = addr{20-16};
+  bits<11> offset = addr{10-0};
+
+  bits<32> Inst;
+
+  let Inst{31-26} = OPGROUP_COP2LDST.Value;
+  let Inst{25-21} = Operation.Value;
+  let Inst{20-16} = rt;
+  let Inst{15-11} = base;
+  let Inst{10-0}  = offset;
+}
diff --git a/llvm/lib/Target/Mips/Mips32r6InstrInfo.td b/llvm/lib/Target/Mips/Mips32r6InstrInfo.td
index 7d6b02d3bc1..ccd7f9b2c3b 100644
--- a/llvm/lib/Target/Mips/Mips32r6InstrInfo.td
+++ b/llvm/lib/Target/Mips/Mips32r6InstrInfo.td
@@ -18,13 +18,8 @@ include "Mips32r6InstrFormats.td"
 // Reencoded: clo, clz
 // Reencoded: jr -> jalr
 // Reencoded: jr.hb -> jalr.hb
-// Reencoded: ldc2
 // Reencoded: ll, sc
-// Reencoded: lwc2
 // Reencoded: sdbbp
-// Reencoded: sdc2
-// Reencoded: swc2
-// Rencoded: [ls][wd]c2
 
 def brtarget21 : Operand<OtherVT> {
   let EncoderMethod = "getBranchTarget21OpValue";
@@ -158,6 +153,11 @@ class CLASS_D_ENC : COP1_2R_FM<0b011011, FIELD_FMT_D>;
 class CACHE_ENC : SPECIAL3_MEM_FM<OPCODE6_CACHE>;
 class PREF_ENC : SPECIAL3_MEM_FM<OPCODE6_PREF>;
 
+class LDC2_R6_ENC : COP2LDST_FM<OPCODE5_LDC2>;
+class LWC2_R6_ENC : COP2LDST_FM<OPCODE5_LWC2>;
+class SDC2_R6_ENC : COP2LDST_FM<OPCODE5_SDC2>;
+class SWC2_R6_ENC : COP2LDST_FM<OPCODE5_SWC2>;
+
 class CMP_CONDN_DESC_BASE<string CondStr, string Typestr,
                           RegisterOperand FGROpnd,
                           SDPatternOperator Op = null_frag> {
@@ -541,6 +541,28 @@ class CACHE_HINT_DESC<string instr_asm, Operand MemOpnd,
 class CACHE_DESC : CACHE_HINT_DESC<"cache", mem_simm9, GPR32Opnd>;
 class PREF_DESC : CACHE_HINT_DESC<"pref", mem_simm9, GPR32Opnd>;
 
+class COP2LD_DESC_BASE<string instr_asm, RegisterOperand COPOpnd> {
+  dag OutOperandList = (outs COPOpnd:$rt);
+  dag InOperandList = (ins mem_simm11:$addr);
+  string AsmString = !strconcat(instr_asm, "\t$rt, $addr");
+  list<dag> Pattern = [];
+  bit mayLoad = 1;
+}
+
+class LDC2_R6_DESC : COP2LD_DESC_BASE<"ldc2", COP2Opnd>;
+class LWC2_R6_DESC : COP2LD_DESC_BASE<"lwc2", COP2Opnd>;
+
+class COP2ST_DESC_BASE<string instr_asm, RegisterOperand COPOpnd> {
+  dag OutOperandList = (outs);
+  dag InOperandList = (ins COPOpnd:$rt, mem_simm11:$addr);
+  string AsmString = !strconcat(instr_asm, "\t$rt, $addr");
+  list<dag> Pattern = [];
+  bit mayStore = 1;
+}
+
+class SDC2_R6_DESC : COP2ST_DESC_BASE<"sdc2", COP2Opnd>;
+class SWC2_R6_DESC : COP2ST_DESC_BASE<"swc2", COP2Opnd>;
+
 //===----------------------------------------------------------------------===//
 //
 // Instruction Definitions
@@ -590,7 +612,9 @@ def DIVU : DIVU_ENC, DIVU_DESC, ISA_MIPS32R6;
 def JIALC : JIALC_ENC, JIALC_DESC, ISA_MIPS32R6;
 def JIC : JIC_ENC, JIC_DESC, ISA_MIPS32R6;
 def JR_HB_R6 : JR_HB_R6_ENC, JR_HB_R6_DESC, ISA_MIPS32R6;
+def LDC2_R6 : LDC2_R6_ENC, LDC2_R6_DESC, ISA_MIPS32R6;
 // def LSA; // See MSA
+def LWC2_R6 : LWC2_R6_ENC, LWC2_R6_DESC, ISA_MIPS32R6;
 def LWPC : LWPC_ENC, LWPC_DESC, ISA_MIPS32R6;
 def LWUPC : LWUPC_ENC, LWUPC_DESC, ISA_MIPS32R6;
 def MADDF_S : MADDF_S_ENC, MADDF_S_DESC, ISA_MIPS32R6;
@@ -615,6 +639,7 @@ def NAL; // BAL with rd=0
 def PREF_R6 : PREF_ENC, PREF_DESC, ISA_MIPS32R6;
 def RINT_D : RINT_D_ENC, RINT_D_DESC, ISA_MIPS32R6;
 def RINT_S : RINT_S_ENC, RINT_S_DESC, ISA_MIPS32R6;
+def SDC2_R6 : SDC2_R6_ENC, SDC2_R6_DESC, ISA_MIPS32R6;
 def SELEQZ : SELEQZ_ENC, SELEQZ_DESC, ISA_MIPS32R6, GPR_32;
 def SELEQZ_D : SELEQZ_D_ENC, SELEQZ_D_DESC, ISA_MIPS32R6;
 def SELEQZ_S : SELEQZ_S_ENC, SELEQZ_S_DESC, ISA_MIPS32R6;
@@ -623,6 +648,7 @@ def SELNEZ_D : SELNEZ_D_ENC, SELNEZ_D_DESC, ISA_MIPS32R6;
 def SELNEZ_S : SELNEZ_S_ENC, SELNEZ_S_DESC, ISA_MIPS32R6;
 def SEL_D : SEL_D_ENC, SEL_D_DESC, ISA_MIPS32R6;
 def SEL_S : SEL_S_ENC, SEL_S_DESC, ISA_MIPS32R6;
+def SWC2_R6 : SWC2_R6_ENC, SWC2_R6_DESC, ISA_MIPS32R6;
 
 //===----------------------------------------------------------------------===//
 //
diff --git a/llvm/lib/Target/Mips/MipsInstrFPU.td b/llvm/lib/Target/Mips/MipsInstrFPU.td
index c1d2bd8b552..aa8f053327f 100644
--- a/llvm/lib/Target/Mips/MipsInstrFPU.td
+++ b/llvm/lib/Target/Mips/MipsInstrFPU.td
@@ -403,10 +403,14 @@ def SDC1 : MMRel, SW_FT<"sdc1", AFGR64Opnd, II_SDC1, store>, LW_FM<0x3d>,
 // Cop2 Memory Instructions
 // FIXME: These aren't really FPU instructions and as such don't belong in this
 //        file
-def LWC2 : LW_FT<"lwc2", COP2Opnd, NoItinerary, load>, LW_FM<0x32>;
-def SWC2 : SW_FT<"swc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3a>;
-def LDC2 : LW_FT<"ldc2", COP2Opnd, NoItinerary, load>, LW_FM<0x36>, ISA_MIPS2;
-def SDC2 : SW_FT<"sdc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3e>, ISA_MIPS2;
+def LWC2 : LW_FT<"lwc2", COP2Opnd, NoItinerary, load>, LW_FM<0x32>,
+           ISA_MIPS1_NOT_32R6_64R6;
+def SWC2 : SW_FT<"swc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3a>,
+           ISA_MIPS1_NOT_32R6_64R6;
+def LDC2 : LW_FT<"ldc2", COP2Opnd, NoItinerary, load>, LW_FM<0x36>,
+           ISA_MIPS2_NOT_32R6_64R6;
+def SDC2 : SW_FT<"sdc2", COP2Opnd, NoItinerary, store>, LW_FM<0x3e>,
+           ISA_MIPS2_NOT_32R6_64R6;
 
 // Cop3 Memory Instructions
 // FIXME: These aren't really FPU instructions and as such don't belong in this
diff --git a/llvm/lib/Target/Mips/MipsInstrInfo.td b/llvm/lib/Target/Mips/MipsInstrInfo.td
index 8503c8290fe..308deecffa2 100644
--- a/llvm/lib/Target/Mips/MipsInstrInfo.td
+++ b/llvm/lib/Target/Mips/MipsInstrInfo.td
@@ -351,6 +351,7 @@ def calltarget  : Operand<iPTR> {
 
 def simm9 : Operand<i32>;
 def simm10 : Operand<i32>;
+def simm11 : Operand<i32>;
 
 def simm16      : Operand<i32> {
   let DecoderMethod= "DecodeSimm16";
@@ -415,6 +416,15 @@ def MipsMemAsmOperand : AsmOperandClass {
   let ParserMethod = "parseMemOperand";
 }
 
+def MipsMemSimm11AsmOperand : AsmOperandClass {
+  let Name = "MemOffsetSimm11";
+  let SuperClasses = [MipsMemAsmOperand];
+  let RenderMethod = "addMemOperands";
+  let ParserMethod = "parseMemOperand";
+  let PredicateMethod = "isMemWithSimmOffset<11>";
+  //let DiagnosticType = "Simm11";
+}
+
 def MipsInvertedImmoperand : AsmOperandClass {
   let Name = "InvNum";
   let RenderMethod = "addImmOperands";
@@ -451,6 +461,12 @@ def mem_simm9 : mem_generic {
   let EncoderMethod = "getMemEncoding";
 }
 
+def mem_simm11 : mem_generic {
+  let MIOperandInfo = (ops ptr_rc, simm11);
+  let EncoderMethod = "getMemEncoding";
+  let ParserMatchClass = MipsMemSimm11AsmOperand;
+}
+
 def mem_ea : Operand<iPTR> {
   let PrintMethod = "printMemOperandEA";
   let MIOperandInfo = (ops ptr_rc, simm16);
diff --git a/llvm/test/MC/Mips/mips1/valid.s b/llvm/test/MC/Mips/mips1/valid.s
index d12b53b038c..aacbfe5401f 100644
--- a/llvm/test/MC/Mips/mips1/valid.s
+++ b/llvm/test/MC/Mips/mips1/valid.s
@@ -44,7 +44,7 @@
         li        $zero,-29889
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwc3      $10,-32265($k0)
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
@@ -99,7 +99,7 @@
         subu      $sp,$s6,$s6
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swc3      $10,-32265($k0)
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
diff --git a/llvm/test/MC/Mips/mips2/valid.s b/llvm/test/MC/Mips/mips2/valid.s
index 4dd1149e422..a8ecb7d5741 100644
--- a/llvm/test/MC/Mips/mips2/valid.s
+++ b/llvm/test/MC/Mips/mips2/valid.s
@@ -43,7 +43,7 @@
         lb        $24,-14515($10)
         lbu       $8,30195($v1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldc3      $29,-28645($s1)
         lh        $11,-8556($s5)
         lhu       $s3,-22851($v0)
@@ -52,7 +52,7 @@
         ll        $v0,-7321($s2)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwc3      $10,-32265($k0)
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
@@ -86,7 +86,7 @@
         sb        $s6,-19857($14)
         sc        $15,18904($s3)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdc3      $12,5835($10)
         sh        $14,-6704($15)
         sll       $a3,18               # CHECK: sll $7, $7, 18         # encoding: [0x00,0x07,0x3c,0x80]
@@ -115,7 +115,7 @@
         subu      $sp,$s6,$s6
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swc3      $10,-32265($k0)
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
diff --git a/llvm/test/MC/Mips/mips3/valid.s b/llvm/test/MC/Mips/mips3/valid.s
index f633e536373..548218a7faf 100644
--- a/llvm/test/MC/Mips/mips3/valid.s
+++ b/llvm/test/MC/Mips/mips3/valid.s
@@ -92,7 +92,7 @@
         lbu       $8,30195($v1)
         ld        $sp,-28645($s1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldl       $24,-4167($24)
         ldr       $14,-30358($s4)
         lh        $11,-8556($s5)
@@ -103,7 +103,7 @@
         lld       $zero,-14736($ra)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwu       $s3,-24086($v1)
@@ -143,7 +143,7 @@
         scd       $15,-8243($sp)
         sd        $12,5835($10)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdl       $a3,-20961($s8)
         sdr       $11,-20423($12)
         sh        $14,-6704($15)
@@ -173,7 +173,7 @@
         subu      $sp,$s6,$s6
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         teqi      $s5,-17504
diff --git a/llvm/test/MC/Mips/mips32/valid.s b/llvm/test/MC/Mips/mips32/valid.s
index d7bea03054d..67fbca7a1f3 100644
--- a/llvm/test/MC/Mips/mips32/valid.s
+++ b/llvm/test/MC/Mips/mips32/valid.s
@@ -50,7 +50,7 @@
         lb        $24,-14515($10)
         lbu       $8,30195($v1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         lh        $11,-8556($s5)
         lhu       $s3,-22851($v0)
         li        $at,-29773
@@ -58,7 +58,7 @@
         ll        $v0,-7321($s2)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         madd      $s6,$13
@@ -113,7 +113,7 @@
         sb        $s6,-19857($14)
         sc        $15,18904($s3)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sh        $14,-6704($15)
         sll       $a3,18               # CHECK: sll $7, $7, 18         # encoding: [0x00,0x07,0x3c,0x80]
         sll       $a3,$zero,18         # CHECK: sll $7, $zero, 18      # encoding: [0x00,0x00,0x3c,0x80]
@@ -141,7 +141,7 @@
         subu      $sp,$s6,$s6
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         teqi      $s5,-17504
diff --git a/llvm/test/MC/Mips/mips32r2/valid.s b/llvm/test/MC/Mips/mips32r2/valid.s
index ba5030a52a8..4d13bba52b2 100644
--- a/llvm/test/MC/Mips/mips32r2/valid.s
+++ b/llvm/test/MC/Mips/mips32r2/valid.s
@@ -57,7 +57,7 @@
         lb        $24,-14515($10)
         lbu       $8,30195($v1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldxc1     $f8,$s7($15)
         lh        $11,-8556($s5)
         lhu       $s3,-22851($v0)
@@ -67,7 +67,7 @@
         luxc1     $f19,$s6($s5)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwxc1     $f12,$s1($s8)
@@ -138,7 +138,7 @@
         sb        $s6,-19857($14)
         sc        $15,18904($s3)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdxc1     $f11,$10($14)
         seb       $25,$15
         seh       $v1,$12
@@ -170,7 +170,7 @@
         suxc1     $f12,$k1($13)
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         swxc1     $f19,$12($k0)
diff --git a/llvm/test/MC/Mips/mips32r6/invalid.s b/llvm/test/MC/Mips/mips32r6/invalid.s
index 8202dbe595a..82cb5ab4943 100644
--- a/llvm/test/MC/Mips/mips32r6/invalid.s
+++ b/llvm/test/MC/Mips/mips32r6/invalid.s
@@ -1,10 +1,14 @@
-# Instructions that are valid for the current ISA but should be rejected by the assembler (e.g.
-# invalid set of operands or operand's restrictions not met).
+# Instructions that are available for the current ISA but should be rejected by
+# the assembler (e.g. invalid set of operands or operand's restrictions not met).
 
 # RUN: not llvm-mc %s -triple=mips-unknown-linux -mcpu=mips32r6 2>%t1
 # RUN: FileCheck %s < %t1 -check-prefix=ASM
 
         .text
         .set noreorder
+        .set noat
         jalr.hb $31 # ASM: :[[@LINE]]:9: error: source and destination must be different
         jalr.hb $31, $31 # ASM: :[[@LINE]]:9: error: source and destination must be different
+        ldc2    $8,-21181($at)   # ASM: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
+        sdc2    $20,23157($s2)   # ASM: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
+        swc2    $25,24880($s0)   # ASM: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
diff --git a/llvm/test/MC/Mips/mips32r6/valid.s b/llvm/test/MC/Mips/mips32r6/valid.s
index 7877f664e43..3364ed9003d 100644
--- a/llvm/test/MC/Mips/mips32r6/valid.s
+++ b/llvm/test/MC/Mips/mips32r6/valid.s
@@ -132,3 +132,7 @@
         jr.hb   $4               # CHECK: jr.hb $4               # encoding: [0x00,0x80,0x04,0x09]
         jalr.hb $4               # CHECK: jalr.hb $4             # encoding: [0x00,0x80,0xfc,0x09]
         jalr.hb $4, $5           # CHECK: jalr.hb $4, $5         # encoding: [0x00,0xa0,0x24,0x09]
+        ldc2    $8, -701($at)    # CHECK: ldc2 $8, -701($1)      # encoding: [0x49,0xc8,0x0d,0x43]
+        lwc2    $18,-841($a2)    # CHECK: lwc2 $18, -841($6)     # encoding: [0x49,0x52,0x34,0xb7]
+        sdc2    $20,629($s2)     # CHECK: sdc2 $20, 629($18)     # encoding: [0x49,0xf4,0x92,0x75]
+        swc2    $25,304($s0)     # CHECK: swc2 $25, 304($16)     # encoding: [0x49,0x79,0x81,0x30]
diff --git a/llvm/test/MC/Mips/mips4/valid.s b/llvm/test/MC/Mips/mips4/valid.s
index 4b328814e1f..0f6bbf0875c 100644
--- a/llvm/test/MC/Mips/mips4/valid.s
+++ b/llvm/test/MC/Mips/mips4/valid.s
@@ -94,7 +94,7 @@
         lbu       $8,30195($v1)
         ld        $sp,-28645($s1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldl       $24,-4167($24)
         ldr       $14,-30358($s4)
         ldxc1     $f8,$s7($15)
@@ -106,7 +106,7 @@
         lld       $zero,-14736($ra)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwu       $s3,-24086($v1)
@@ -160,7 +160,7 @@
         scd       $15,-8243($sp)
         sd        $12,5835($10)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdl       $a3,-20961($s8)
         sdr       $11,-20423($12)
         sdxc1     $f11,$10($14)
@@ -191,7 +191,7 @@
         subu      $sp,$s6,$s6
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         swxc1     $f19,$12($k0)
diff --git a/llvm/test/MC/Mips/mips5/valid.s b/llvm/test/MC/Mips/mips5/valid.s
index 8730ab6fcaa..69a5e9eb6b4 100644
--- a/llvm/test/MC/Mips/mips5/valid.s
+++ b/llvm/test/MC/Mips/mips5/valid.s
@@ -94,7 +94,7 @@
         lbu       $8,30195($v1)
         ld        $sp,-28645($s1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldl       $24,-4167($24)
         ldr       $14,-30358($s4)
         ldxc1     $f8,$s7($15)
@@ -107,7 +107,7 @@
         luxc1     $f19,$s6($s5)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwu       $s3,-24086($v1)
@@ -161,7 +161,7 @@
         scd       $15,-8243($sp)
         sd        $12,5835($10)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdl       $a3,-20961($s8)
         sdr       $11,-20423($12)
         sdxc1     $f11,$10($14)
@@ -193,7 +193,7 @@
         suxc1     $f12,$k1($13)
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         swxc1     $f19,$12($k0)
diff --git a/llvm/test/MC/Mips/mips64/valid.s b/llvm/test/MC/Mips/mips64/valid.s
index 6841c3df8de..3b4f4681220 100644
--- a/llvm/test/MC/Mips/mips64/valid.s
+++ b/llvm/test/MC/Mips/mips64/valid.s
@@ -99,7 +99,7 @@
         lbu       $8,30195($v1)
         ld        $sp,-28645($s1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldl       $24,-4167($24)
         ldr       $14,-30358($s4)
         ldxc1     $f8,$s7($15)
@@ -112,7 +112,7 @@
         luxc1     $f19,$s6($s5)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwu       $s3,-24086($v1)
@@ -175,7 +175,7 @@
         scd       $15,-8243($sp)
         sd        $12,5835($10)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdl       $a3,-20961($s8)
         sdr       $11,-20423($12)
         sdxc1     $f11,$10($14)
@@ -207,7 +207,7 @@
         suxc1     $f12,$k1($13)
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         swxc1     $f19,$12($k0)
diff --git a/llvm/test/MC/Mips/mips64r2/valid.s b/llvm/test/MC/Mips/mips64r2/valid.s
index c74c8e36a2f..f812c531877 100644
--- a/llvm/test/MC/Mips/mips64r2/valid.s
+++ b/llvm/test/MC/Mips/mips64r2/valid.s
@@ -113,7 +113,7 @@
         lbu       $8,30195($v1)
         ld        $sp,-28645($s1)
         ldc1      $f11,16391($s0)
-        ldc2      $8,-21181($at)
+        ldc2      $8,-21181($at)        # CHECK: ldc2 $8, -21181($1)   # encoding: [0xd8,0x28,0xad,0x43]
         ldl       $24,-4167($24)
         ldr       $14,-30358($s4)
         ldxc1     $f8,$s7($15)
@@ -126,7 +126,7 @@
         luxc1     $f19,$s6($s5)
         lw        $8,5674($a1)
         lwc1      $f16,10225($k0)
-        lwc2      $18,-841($a2)
+        lwc2      $18,-841($a2)        # CHECK: lwc2 $18, -841($6)     # encoding: [0xc8,0xd2,0xfc,0xb7]
         lwl       $s4,-4231($15)
         lwr       $zero,-19147($gp)
         lwu       $s3,-24086($v1)
@@ -200,7 +200,7 @@
         scd       $15,-8243($sp)
         sd        $12,5835($10)
         sdc1      $f31,30574($13)
-        sdc2      $20,23157($s2)
+        sdc2      $20,23157($s2)       # CHECK: sdc2 $20, 23157($18)   # encoding: [0xfa,0x54,0x5a,0x75]
         sdl       $a3,-20961($s8)
         sdr       $11,-20423($12)
         sdxc1     $f11,$10($14)
@@ -234,7 +234,7 @@
         suxc1     $f12,$k1($13)
         sw        $ra,-10160($sp)
         swc1      $f6,-8465($24)
-        swc2      $25,24880($s0)
+        swc2      $25,24880($s0)       # CHECK: swc2 $25, 24880($16)   # encoding: [0xea,0x19,0x61,0x30]
         swl       $15,13694($s3)
         swr       $s1,-26590($14)
         swxc1     $f19,$12($k0)
diff --git a/llvm/test/MC/Mips/mips64r6/invalid.s b/llvm/test/MC/Mips/mips64r6/invalid.s
index 4b80d6d5c24..1b01827368a 100644
--- a/llvm/test/MC/Mips/mips64r6/invalid.s
+++ b/llvm/test/MC/Mips/mips64r6/invalid.s
@@ -1,10 +1,12 @@
-# Instructions that are valid for the current ISA but should be rejected by the assembler (e.g.
-# invalid set of operands or operand's restrictions not met).
+# Instructions that are available for the current ISA but should be rejected by
+# the assembler (e.g. invalid set of operands or operand's restrictions not met).
 
 # RUN: not llvm-mc %s -triple=mips64-unknown-linux -mcpu=mips64r6 2>%t1
 # RUN: FileCheck %s < %t1 -check-prefix=ASM
 
         .text
         .set noreorder
+	.set noat
         jalr.hb $31 # ASM: :[[@LINE]]:9: error: source and destination must be different
         jalr.hb $31, $31 # ASM: :[[@LINE]]:9: error: source and destination must be different
+        ldc2    $8,-21181($at)   # ASM: :[[@LINE]]:{{[0-9]+}}: error: instruction requires a CPU feature not currently enabled
diff --git a/llvm/test/MC/Mips/mips64r6/valid.s b/llvm/test/MC/Mips/mips64r6/valid.s
index 8a2030649d5..b8274829b02 100644
--- a/llvm/test/MC/Mips/mips64r6/valid.s
+++ b/llvm/test/MC/Mips/mips64r6/valid.s
@@ -146,3 +146,7 @@
         jr.hb   $4               # CHECK: jr.hb $4               # encoding: [0x00,0x80,0x04,0x09]
         jalr.hb $4               # CHECK: jalr.hb $4             # encoding: [0x00,0x80,0xfc,0x09]
         jalr.hb $4, $5           # CHECK: jalr.hb $4, $5         # encoding: [0x00,0xa0,0x24,0x09]
+        ldc2    $8, -701($at)    # CHECK: ldc2 $8, -701($1)      # encoding: [0x49,0xc8,0x0d,0x43]
+        lwc2    $18,-841($a2)    # CHECK: lwc2 $18, -841($6)     # encoding: [0x49,0x52,0x34,0xb7]
+        sdc2    $20,629($s2)     # CHECK: sdc2 $20, 629($18)     # encoding: [0x49,0xf4,0x92,0x75]
+        swc2    $25,304($s0)     # CHECK: swc2 $25, 304($16)     # encoding: [0x49,0x79,0x81,0x30]