fix Issue 7806 - ICE(gloop.c) iterating with idouble, when compiling …

…with -O

src/backend/gloop.c

@@ -2231,6 +2231,10 @@ STATIC void findbasivs(loop *l)
         if (tyaggregate(s->ty()))
                 continue;
 
+        // Do not use complex types as basic IVs, as the code gen isn't up to it
+        if (tycomplex(s->ty()))
+                continue;
+
         biv = Iv::mycalloc();
         biv->IVnext = l->Livlist;
         l->Livlist = biv;               // link into list of IVs
@@ -2450,6 +2454,9 @@ STATIC void ivfamelems(register Iv *biv,register elem **pn)
   else                                  /* else leaf elem               */
         return;                         /* which can't be in the family */
 
+  if (tycomplex(n->Ety))
+        return;
+
   if (op == OPmul || op == OPadd || op == OPmin ||
         op == OPneg || op == OPshl)
   {     /* Note that we are wimping out and not considering             */

test/runnable/complex.d

@@ -2,6 +2,7 @@
 
 import std.stdio;
 import std.math;
+import core.stdc.stdio;
 
 /***************************************/
 
@@ -342,6 +343,18 @@ void test10677()
 
 /***************************************/
 
+void test7806()
+{
+    for (idouble i = -2i; i <= 2i; i += .125i)
+        for (double r = -2; r <= 2; r += .0625)
+        {
+            cdouble c = r + i;
+            printf("%g %gi\n", c.re, c.im);
+        }
+}
+
+/***************************************/
+
 int main(char[][] args)
 {
 
@@ -365,6 +378,7 @@ int main(char[][] args)
     test7591();
     test8966();
     test10677();
+    test7806();
 
     printf("Success!\n");
     return 0;