(find_reg): Store divide results in temporary variables.

From-SVN: r7778

1 files changed, 27 insertions, 19 deletions

diff --git a/gcc/global.c b/gcc/global.c
index 297e930..3f15cbe 100644
--- a/gcc/global.c
+++ b/gcc/global.c
@@ -1096,28 +1096,36 @@ 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))
 	    {
-	      /* Hard reg REGNO was used less in total by local regs
-		 than it would be used by this one allocno!  */
-	      int k;
-	      for (k = 0; k < max_regno; k++)
-		if (reg_renumber[k] >= 0)
-		  {
-		    int r = reg_renumber[k];
-		    int endregno
-		      = r + HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (k));
+	      /* 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!  */
+		  int k;
+		  for (k = 0; k < max_regno; k++)
+		    if (reg_renumber[k] >= 0)
+		      {
+			int r = reg_renumber[k];
+			int endregno
+			  = r + HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (k));
 
-		    if (regno >= r && regno < endregno)
-		      reg_renumber[k] = -1;
-		  }
+			if (regno >= r && regno < endregno)
+			  reg_renumber[k] = -1;
+		      }
 
-	      best_reg = regno;
-	      break;
+		  best_reg = regno;
+		  break;
+		}
 	    }
 	}
     }