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From: "Alex.Velenko at arm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/64916] New: ira.c update_equiv_regs patch causes gcc/testsuite/gcc.target/arm/pr43920-2.c regression
Date: Tue, 03 Feb 2015 12:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64916

            Bug ID: 64916
           Summary: ira.c update_equiv_regs patch causes
                    gcc/testsuite/gcc.target/arm/pr43920-2.c regression
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Alex.Velenko at arm dot com
                CC: amker.cheng at gmail dot com, fei.yang0953 at gmail dot com,
                    law at redhat dot com, marcus.shawcroft at arm dot com
             Build: arm-none-eabi

Created attachment 34650
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34650&action=edit
Tar with patched and non-patched rtl dump file tars

In pr43920-2.c code block for "return -1;" c statement is not getting reused
after
ira.c update_equiv_regs patch. I believe svn it's number is r216169.
Reason - patch removes "(expr_list:REG_EQUAL (const_int -1
[0xffffffffffffffff])" note in ira pass, which prevents jump2 optimization.
This information still needs to be passed to jump2 pass.
See rtl dump attachments below.