[Bug middle-end/33181] [4.3 Regression] Revision 127766 generates bad cmov

hjl at lucon dot org gcc-bugzilla@gcc.gnu.org
Sun Aug 26 14:43:00 GMT 2007



------- Comment #6 from hjl at lucon dot org  2007-08-26 14:42 -------
This patch

2007-08-26  H.J. Lu  <hongjiu.lu@intel.com>

        PR middle-end/33181
        * ifcvt.c (noce_process_if_block): Don't move insn across
        basic block.

--- gcc/ifcvt.c.cmov    2007-08-24 06:02:57.000000000 -0700
+++ gcc/ifcvt.c 2007-08-26 07:35:50.000000000 -0700
@@ -2198,6 +2198,7 @@ noce_process_if_block (struct noce_if_in
         COND_EARLIEST to JUMP.  Make sure the relevant data is still
         intact.  */
       if (! insn_b
+         || BLOCK_NUM (insn_b) != BLOCK_NUM (if_info->cond_earliest)
          || !NONJUMP_INSN_P (insn_b)
          || (set_b = single_set (insn_b)) == NULL_RTX
          || ! rtx_equal_p (x, SET_DEST (set_b))

works for me. Does it make senses?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33181



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