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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/61923] [4.8/4.9/4.10 Regression] -fcompare-debug errors while building Linux kernel.
Date: Tue, 29 Jul 2014 06:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61923

--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Created attachment 33200
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33200&action=edit
original testcase

The issue is more visible with the original attached testcase:

markus@x4 linux % diff -u inode.gkd inode.gk.gkd
--- inode.gkd   2014-07-29 08:52:00.453657959 +0200
+++ inode.gk.gkd        2014-07-29 08:52:01.636965368 +0200
@@ -4270,15 +4270,6 @@
             (nil))))
 (code_label 158 0 0 16 158 "" [1 uses])
 (note# 0 0 [bb 16] NOTE_INSN_BASIC_BLOCK)
-(insn:TI# 0 0 16 (set (reg:SI 37 r8)
-        (const_int 2 [0x2])) fs/ext4/inode.c:1632# {*movsi_internal}
-     (nil))
-(insn# 0 0 16 (set (reg:DI 2 cx)
-        (const_int -1 [0xffffffffffffffff])) fs/ext4/inode.c:1632#
{*movdi_internal}
-     (nil))
-(insn# 0 0 16 (set (reg:DI 5 di)
-        (reg/v/f:DI 44 r15 [orig:208 inode ] [208])) fs/ext4/inode.c:1632#
{*movdi_internal}
-     (nil))
 (insn:TI# 0 0 16 (set (reg:SI 1 dx)
         (mem/c:SI (plus:DI (reg/f:DI 7 sp)
                 (const_int 28 [0x1c])) [ map.m_len+0 S4 A32]))
fs/ext4/inode.c:1632# {*movsi_internal}
@@ -4287,6 +4278,15 @@
         (mem/c:SI (plus:DI (reg/f:DI 7 sp)
                 (const_int 24 [0x18])) [ map.m_lblk+0 S4 A64]))
fs/ext4/inode.c:1632# {*movsi_internal}
      (nil))
+(insn# 0 0 16 (set (reg:SI 37 r8)
+        (const_int 2 [0x2])) fs/ext4/inode.c:1632# {*movsi_internal}
+     (nil))
+(insn:TI# 0 0 16 (set (reg:DI 2 cx)
+        (const_int -1 [0xffffffffffffffff])) fs/ext4/inode.c:1632#
{*movdi_internal}
+     (nil))
+(insn# 0 0 16 (set (reg:DI 5 di)
+        (reg/v/f:DI 44 r15 [orig:208 inode ] [208])) fs/ext4/inode.c:1632#
{*movdi_internal}
+     (nil))
 (call_insn:TI# 0 0 16 (set (reg:SI 0 ax)
         (call (mem:QI (symbol_ref:DI ("ext4_es_insert_extent") [flags 0x41] 
<function_decl # ext4_es_insert_extent>) [ ext4_es_insert_extent S1 A8])
             (const_int 0 [0]))) fs/ext4/inode.c:1632# {*call_value}