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Add support for negation.

--- a/8/insns.def

+++ b/8/insns.def

@@ -26,6 +26,7 @@

 Insn(Isub,      "\tsub%t %r,%x\n",              0)

 Insn(Imul,      "\tmul%t %r\n",              0)

 Insn(Idiv,      "\tdiv%t %r\n",              0)

+Insn(Ineg,      "\tneg%t %r\n",              0)

 Insn(Iand,      "\tand%t %r,%x\n",              0)

 Insn(Ior,       "\tor%t %r,%x\n",               0)

 Insn(Ixor,      "\txor%t %r,%x\n",              0)

--- a/8/isel.c

+++ b/8/isel.c

@@ -552,7 +552,11 @@

             else

                 r = edx;

             break;

-        case Oneg:      die("Unimplemented op %s", opstr(exprop(n))); break;

+        case Oneg:

+            r = selexpr(s, args[0]);

+            r = inr(s, r);

+            g(s, Ineg, &r, NULL);

+            break;

         case Obor:      r = binop(s, Ior,  args[0], args[1]); break;

         case Oband:     r = binop(s, Iand, args[0], args[1]); break;

--- a/test/loop.myr

+++ b/test/loop.myr

@@ -1,6 +1,3 @@

-const f = {a

-}

-

 const main = {

 	var i

 	var n

--- a/test/test.sh

+++ b/test/test.sh

@@ -20,9 +20,13 @@

 }

 function exitswith {

-    ./$1

-    if [ $? -eq $2 ]; then

-        echo "PASS: $1"

+    if [ -e $1 ]; then

+        ./$1

+        if [ $? -eq $2 ]; then

+            echo "PASS: $1"

+        else

+            echo "FAIL: $1"

+        fi

     else

         echo "FAIL: $1"

     fi