[patch] Upstream gcc patch for versions < 4.4

gcc-arm-frename-registers.patch (text/plain), 1.12 KB, created by Sven 'sleipnir' Rebhan on 2009-03-11 20:23:34 UTC

Patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35964 to
fix a segfault in gcc < 4.4 on arm if -frename-registers is used.

ChangeLog (regrename) 
 
     gcc/ 
     * regrename.c: Unshare RTX earlier in build_def_use to avoid 
     corruption of dup_loc. 
 

Index: gcc/regrename.c
===================================================================
--- gcc/regrename.c	(revision 197947)
+++ gcc/regrename.c	(working copy)
@@ -783,6 +783,10 @@ build_def_use (basic_block bb)
 		recog_data.operand_type[i] = OP_INOUT;
 	    }
 
+	  /* Unshare dup_loc RTL */
+	  for (i = 0; i < recog_data.n_dups; i++)
+	    *recog_data.dup_loc[i] = copy_rtx(*recog_data.dup_loc[i]);
+
 	  /* Step 1: Close chains for which we have overlapping reads.  */
 	  for (i = 0; i < n_ops; i++)
 	    scan_rtx (insn, recog_data.operand_loc[i],
@@ -813,7 +817,7 @@ build_def_use (basic_block bb)
 		    OP_IN, 0);
 
 	  for (i = 0; i < recog_data.n_dups; i++)
-	    *recog_data.dup_loc[i] = copy_rtx (old_dups[i]);
+	    *recog_data.dup_loc[i] = old_dups[i];
 	  for (i = 0; i < n_ops; i++)
 	    *recog_data.operand_loc[i] = old_operands[i];
 	  if (recog_data.n_dups)