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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/57106] [4.8/4.9 Regression] -fcompare-debug failure with -O2 -fschedule-insns -funroll-all-loops
Date: Fri, 03 May 2013 11:49:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57106

Uros Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ubizjak at gmail dot com,
                   |                            |ysrumyan at gmail dot com

--- Comment #3 from Uros Bizjak <ubizjak at gmail dot com> 2013-05-03 11:49:51 UTC ---
The dependence in i386.c:add_parameter_dependencies adds dependence of the
instruction with wrong index. Proposed patch:

--cut here--
Index: i386.c
===================================================================
--- i386.c      (revision 198569)
+++ i386.c      (working copy)
@@ -24662,7 +24662,7 @@ add_parameter_dependencies (rtx call, rtx head)
          /* Add output depdendence between two function arguments if chain
             of output arguments contains likely spilled HW registers.  */
          if (is_spilled)
-           add_dependence (last, insn, REG_DEP_OUTPUT);
+           add_dependence (first_arg, insn, REG_DEP_OUTPUT);
          first_arg = last = insn;
        }
       else
--cut here--

CC'd author.