Don't read an operand that doesn't exist

MoarVM · Jun 20, 2018 · c14094a · c14094a
1 parent 6fb5277
commit c14094a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/jit/x64/emit.dasc b/src/jit/x64/emit.dasc
@@ -2517,11 +2517,11 @@ void MVM_jit_emit_guard(MVMThreadContext *tc, MVMJitCompiler *compiler, MVMJitGr
                         MVMJitGuard *guard) {
     MVMint16 op        = guard->ins->info->opcode;
     MVMint16 obj       = guard->ins->operands[0].reg.orig;
-    MVMint16 spesh_idx = guard->ins->operands[1].lit_i16;
     MVM_jit_log(tc, "emit guard <%s>\n", guard->ins->info->name);
     /* load object and spesh slot value, except for those that don't need it */
     | mov TMP1, WORK[obj];
     if (op != MVM_OP_sp_guardjustconc && op != MVM_OP_sp_guardjusttype) {
+        MVMint16 spesh_idx = guard->ins->operands[1].lit_i16;
         | get_spesh_slot TMP2, spesh_idx;
     }
     if (op == MVM_OP_sp_guard) {