[mips][microMIPS] Implement LWXS instruction.

Differential Revision: http://reviews.llvm.org/D5407

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222348 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/Mips/MicroMipsInstrFormats.td b/lib/Target/Mips/MicroMipsInstrFormats.td
index b7b9dc6406eb1e522a3b372b4871397b18acd1b9..d1e02b8c5fe1b8726884a3dad408e316041dfad1 100644 (file)
--- a/lib/Target/Mips/MicroMipsInstrFormats.td
+++ b/lib/Target/Mips/MicroMipsInstrFormats.td
@@ -789,3 +789,18 @@ class RDHWR_FM_MM : MMArch {
   let Inst{15-6}  = 0x1ac;
   let Inst{5-0}   = 0x3c;
 }
+
+class LWXS_FM_MM<bits<10> funct> {
+  bits<5> rd;
+  bits<5> base;
+  bits<5> index;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x0;
+  let Inst{25-21} = index;
+  let Inst{20-16} = base;
+  let Inst{15-11} = rd;
+  let Inst{10}    = 0;
+  let Inst{9-0}   = funct;
+}

diff --git a/lib/Target/Mips/MicroMipsInstrInfo.td b/lib/Target/Mips/MicroMipsInstrInfo.td
index 66a08754bd2a79df64659987684d6aef33428ec6..32271beeef6fe918bb47b799e037600f7f7fb5a9 100644 (file)
--- a/lib/Target/Mips/MicroMipsInstrInfo.td
+++ b/lib/Target/Mips/MicroMipsInstrInfo.td
@@ -260,6 +260,12 @@ let isCall = 1, hasDelaySlot = 1, Defs = [RA] in {
            !strconcat(opstr, "\t$rs, $offset"), [], IIBranch, FrmI, opstr>;
 }
 
+class LoadWordIndexedScaledMM<string opstr, RegisterOperand RO,
+                              InstrItinClass Itin = NoItinerary,
+                              SDPatternOperator OpNode = null_frag> :
+  InstSE<(outs RO:$rd), (ins PtrRC:$base, PtrRC:$index),
+         !strconcat(opstr, "\t$rd, ${index}(${base})"), [], Itin, FrmFI>;
+
 def ADDU16_MM : ArithRMM16<"addu16", GPRMM16Opnd, 1, II_ADDU, add>,
                 ARITH_FM_MM16<0>;
 def SUBU16_MM : ArithRMM16<"subu16", GPRMM16Opnd, 0, II_SUBU, sub>,
@@ -377,6 +383,8 @@ let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
     def SW_MM  : Store<"sw", GPR32Opnd>, MMRel, LW_FM_MM<0x3e>;
   }
 
+  def LWXS_MM : LoadWordIndexedScaledMM<"lwxs", GPR32Opnd>, LWXS_FM_MM<0x118>;
+
   def LWU_MM : LoadMM<"lwu", GPR32Opnd, zextloadi32, II_LWU>, LL_FM_MM<0xe>;
 
   /// Load and Store Instructions - unaligned

diff --git a/test/MC/Mips/micromips-loadstore-instructions.s b/test/MC/Mips/micromips-loadstore-instructions.s
index 8a1b93babdd81a3314cb951542fd33a1166b16a7..e5ce78a90509b091c98fc58a4d9e06cf0538a244 100644 (file)
--- a/test/MC/Mips/micromips-loadstore-instructions.s
+++ b/test/MC/Mips/micromips-loadstore-instructions.s
@@ -20,6 +20,7 @@
 # CHECK-EL: ll     $2, 8($4)      # encoding: [0x44,0x60,0x08,0x30]
 # CHECK-EL: sc     $2, 8($4)      # encoding: [0x44,0x60,0x08,0xb0]
 # CHECK-EL: lwu    $2, 8($4)      # encoding: [0x44,0x60,0x08,0xe0]
+# CHECK-EL: lwxs   $2, $3($4)     # encoding: [0x64,0x00,0x18,0x11]
 #------------------------------------------------------------------------------
 # Big endian
 #------------------------------------------------------------------------------
@@ -34,6 +35,7 @@
 # CHECK-EB: ll     $2, 8($4)      # encoding: [0x60,0x44,0x30,0x08]
 # CHECK-EB: sc     $2, 8($4)      # encoding: [0x60,0x44,0xb0,0x08]
 # CHECK-EB: lwu    $2, 8($4)      # encoding: [0x60,0x44,0xe0,0x08]
+# CHECK-EB: lwxs   $2, $3($4)     # encoding: [0x00,0x64,0x11,0x18]
      lb     $5, 8($4)
      lbu    $6, 8($4)
      lh     $2, 8($4)
@@ -45,3 +47,4 @@
      ll     $2, 8($4)
      sc     $2, 8($4)
      lwu    $2, 8($4)
+     lwxs   $2, $3($4)