getstderr is used in NFA's optimize and mergesubrule

when you have a module that add lots of operators,
this can give a noticable speed-up.

the NFA situation wants an algorithmic improvement
instead, though.

src/jit/emit_x64.dasc

@@ -1515,6 +1515,21 @@ void MVM_jit_emit_primitive(MVMThreadContext *tc, MVMJitGraph *jg,
         /* jumping out is handled by invokish */
         break;
     }
+    case MVM_OP_getstdin:
+    case MVM_OP_getstdout:
+    case MVM_OP_getstderr: {
+        MVMint16 dst = ins->operands[0].reg.orig;
+        | mov TMP3, aword TC->instance;
+        if (ins->info->opcode == MVM_OP_getstdin) {
+            | mov TMP3, aword MVMINSTANCE:TMP3->stdin_handle;
+        } else if (ins->info->opcode == MVM_OP_getstdout) {
+            | mov TMP3, aword MVMINSTANCE:TMP3->stdout_handle;
+        } else if (ins->info->opcode == MVM_OP_getstderr) {
+            | mov TMP3, aword MVMINSTANCE:TMP3->stderr_handle;
+        }
+        | mov aword WORK[dst], TMP3;
+        break;
+    }
     case MVM_OP_ordat:
     case MVM_OP_ordfirst: {
         MVMint16 dst = ins->operands[0].reg.orig;

src/jit/graph.c

@@ -1513,6 +1513,9 @@ static MVMint32 jgb_consume_ins(MVMThreadContext *tc, JitGraphBuilder *jgb,
     case MVM_OP_paramnamesused:
     case MVM_OP_assertparamcheck:
     case MVM_OP_getobjsc:
+    case MVM_OP_getstderr:
+    case MVM_OP_getstdout:
+    case MVM_OP_getstdin:
     case MVM_OP_ordat:
     case MVM_OP_ordfirst:
         /* Profiling */