[mips][microMIPS] Implement JRC instruction

[jkolek]

Summary

Implement 16-bit microMIPS jump instruction with no delay slot - JRC.

[sstankovic]

lib/Target/Mips/MicroMipsInstrInfo.td

139

jrc is not a call instruction, so isCall should be set to 0, and also comment should be changed.

test/MC/Mips/micromips-16-bit-instructions.s

16

jrc has no delay slot, so you should check it here, by using NEXT to ensure that next instruction is the one that follows in the .s file.

28

Same here.

[sstankovic]

LGTM

Closed by commit rL219494 (authored by zjovanovic).

lib/Target/Mips/MicroMipsInstrInfo.td

   let Defs = [RA];
 }
 
+// 16-bit Jump Register Compact - No delay slot
+class JumpRegCMM16<string opstr, RegisterOperand RO> :
+  MicroMipsInst16<(outs), (ins RO:$rs), !strconcat(opstr, "\t$rs"),
+                  [], IIBranch, FrmR> {
+  let isTerminator = 1;
+  let isBarrier = 1;
+  let isBranch = 1;
+  let isIndirectBranch = 1;
+}
+
 // MicroMIPS Jump and Link (Call) - Short Delay Slot
 let isCall = 1, hasDelaySlot = 1, Defs = [RA] in {
   class JumpLinkMM<string opstr, DAGOperand opnd> :

 def MOVE16_MM : MoveMM16<"move", GPR32Opnd>, MOVE_FM_MM16<0x03>;
 def JALR16_MM : JumpLinkRegMM16<"jalr", GPR32Opnd>, JALR_FM_MM16<0x0e>;
 def JALRS16_MM : JumpLinkRegSMM16<"jalrs16", GPR32Opnd>, JALR_FM_MM16<0x0f>;
+def JRC16_MM : JumpRegCMM16<"jrc", GPR32Opnd>, JALR_FM_MM16<0x0d>;
 def JRADDIUSP : JumpRAddiuStackMM16, JRADDIUSP_FM_MM16<0x18>;
 
 class WaitMM<string opstr> :

test/MC/Mips/micromips-16-bit-instructions.s

 # CHECK-EL: mfhi    $9              # encoding: [0x09,0x46]
 # CHECK-EL: mflo    $9              # encoding: [0x49,0x46]
 # CHECK-EL: move    $25, $1         # encoding: [0x21,0x0f]
-# CHECK-EL: jalr    $9              # encoding: [0xc9,0x45]
+# CHECK-EL: jrc     $9              # encoding: [0xa9,0x45]
+# CHECK-NEXT: jalr    $9            # encoding: [0xc9,0x45]
 # CHECK-EL: jraddiusp 20            # encoding: [0x05,0x47]
 # CHECK-EL: nop                     # encoding: [0x00,0x00,0x00,0x00]
 # CHECK-EL: jalrs16 $9              # encoding: [0xe9,0x45]

 # CHECK-EB: mfhi    $9              # encoding: [0x46,0x09]
 # CHECK-EB: mflo    $9              # encoding: [0x46,0x49]
 # CHECK-EB: move    $25, $1         # encoding: [0x0f,0x21]
-# CHECK-EB: jalr    $9              # encoding: [0x45,0xc9]
+# CHECK-EB: jrc     $9              # encoding: [0x45,0xa9]
+# CHECK-NEXT: jalr    $9            # encoding: [0x45,0xc9]
 # CHECK-EB: jraddiusp 20            # encoding: [0x47,0x05]
 # CHECK-EB: nop                     # encoding: [0x00,0x00,0x00,0x00]
 # CHECK-EB: jalrs16 $9              # encoding: [0x45,0xe9]

     mfhi    $9
     mflo    $9
     move    $25, $1
+    jrc     $9
     jalr    $9
     jraddiusp 20
     jalrs16 $9