diff --git a/src/gallium/drivers/llvmpipe/lp_test_main.c b/src/gallium/drivers/llvmpipe/lp_test_main.c
index 518ca27..5ec0dd3 100644
--- a/src/gallium/drivers/llvmpipe/lp_test_main.c
+++ b/src/gallium/drivers/llvmpipe/lp_test_main.c
@@ -147,6 +147,7 @@ write_elem(struct lp_type type, void *dst, unsigned index, double value)
       if(type.sign) {
          long long lvalue = (long long)value;
          lvalue = MIN2(lvalue, ((long long)1 << (type.width - 1)) - 1);
+         lvalue = MAX2(lvalue, -((long long)1 << (type.width - 1)));
          switch(type.width) {
          case 8:
             *((int8_t *)dst + index) = (int8_t)lvalue;
@@ -200,16 +201,24 @@ random_elem(struct lp_type type, void *dst, unsigned index)
       }
       else {
          unsigned long long mask;
-	 if (type.fixed)
+         if (type.fixed)
             mask = ((unsigned long long)1 << (type.width / 2)) - 1;
          else if (type.sign)
             mask = ((unsigned long long)1 << (type.width - 1)) - 1;
          else
             mask = ((unsigned long long)1 << type.width) - 1;
          value += (double)(mask & rand());
+         if (!type.fixed && !type.sign && type.width == 32) {
+            /*
+             * rand only returns half the possible range
+             * XXX 64bit values...
+             */
+            if(rand() & 1)
+               value += (double)0x80000000;
+         }
       }
    }
-   if(!type.sign)
+   if(type.sign)
       if(rand() & 1)
          value = -value;
    write_elem(type, dst, index, value);