From: Richard Kenner <kenner@gcc.gnu.org>
Date: Sun, 19 Sep 1993 16:48:55 +0000 (-0400)
Subject: (find_reloads): Reject an alternative if two operands match the same
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e64c4f9e2e81206c40dab6de2054cfb265db1ac2;p=platform%2Fupstream%2Fgcc.git

(find_reloads): Reject an alternative if two operands match the same
output and we have to do a reload.

From-SVN: r5363
---

diff --git a/gcc/reload.c b/gcc/reload.c
index a0199e8..27d017d 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -2730,6 +2730,17 @@ find_reloads (insn, replace, ind_levels, live_known, reload_reg_p)
 		   we are supposed to match can be fixed with reloads.  */
 		badop = 0;
 		this_alternative[i] = this_alternative[c];
+
+		/* If we have to reload this operand and some previous
+		   operand also had to match the same thing as this
+		   operand, we don't know how to do that.  So reject this
+		   alternative.  */
+		if (! win || force_reload)
+		  for (j = 0; j < i; j++)
+		    if (this_alternative_matches[j]
+			== this_alternative_matches[i])
+		      badop = 1;
+
 		break;
 
 	      case 'p':