(find_reg): Store divide results in temporary variables.

From-SVN: r7778

gcc/global.c

@@ -1096,11 +1096,18 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
 	  if (local_reg_n_refs[regno] != 0
 	      /* Don't use a reg no good for this pseudo.  */
 	      && ! TEST_HARD_REG_BIT (used2, regno)
-	      && HARD_REGNO_MODE_OK (regno, mode)
-	      && (((double) local_reg_n_refs[regno]
-		   / local_reg_live_length[regno])
-		  < ((double) allocno_n_refs[allocno]
-		     / allocno_live_length[allocno])))
+	      && HARD_REGNO_MODE_OK (regno, mode))
+	    {
+	      /* We explicitly evaluate the divide results into temporary
+		 variables so as to avoid excess precision problems that occur
+		 on a i386-unknown-sysv4.2 (unixware) host.  */
+		 
+	      double tmp1 = ((double) local_reg_n_refs[regno]
+			    / local_reg_live_length[regno]);
+	      double tmp2 = ((double) allocno_n_refs[allocno]
+			     / allocno_live_length[allocno]);
+
+	      if (tmp1 < tmp2)
 		{
 		  /* Hard reg REGNO was used less in total by local regs
 		     than it would be used by this one allocno!  */
@@ -1121,6 +1128,7 @@ find_reg (allocno, losers, alt_regs_p, accept_call_clobbered, retrying)
 		}
 	    }
 	}
+    }
 
   /* Did we find a register?  */