Add numeric negation

MoarVM · Oct 13, 2014 · e75de84 · e75de84
1 parent 03ac9a7
commit e75de84
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diff --git a/src/jit/emit_x64.dasc b/src/jit/emit_x64.dasc
@@ -735,6 +735,17 @@ void MVM_jit_emit_primitive(MVMThreadContext *tc, MVMJitGraph *jg,
         | mov WORK[dst], rax;
         break;
     }
+    case MVM_OP_neg_n: {
+        /* Negation is xor-ing the highest byte. Pretty simple right */
+        MVMint16 dst = ins->operands[0].reg.orig;
+        MVMint16 src = ins->operands[1].reg.orig;
+        | mov TMP1, 1;
+        | sal TMP1, 63;
+        | mov TMP2, qword WORK[src];
+        | xor TMP2, TMP1;
+        | mov qword WORK[dst], TMP2;
+        break;
+    }
     case MVM_OP_eq_i:
     case MVM_OP_eqaddr:
     case MVM_OP_ne_i:

diff --git a/src/jit/graph.c b/src/jit/graph.c
@@ -658,6 +658,7 @@ static MVMint32 jgb_consume_ins(MVMThreadContext *tc, JitGraphBuilder *jgb,
     case MVM_OP_sub_n:
     case MVM_OP_mul_n:
     case MVM_OP_div_n:
+    case MVM_OP_neg_n:
         /* number coercion */
     case MVM_OP_coerce_ni:
     case MVM_OP_coerce_in: