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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/109777] [14 regression] Compare-debug failure after
 recent changes
Date: Mon, 08 May 2023 18:51:59 +0000
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X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: compare-debug-failure
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109777

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
          Component|middle-end                  |target
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-05-08

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The place where the first difference in IR (not withstanding the debug insn=
s)
is mach.

Without -g, there is an forced_nop instruction being added:
(insn:SI # # # 6 (set (reg:SI 3 R3 [177])
        (ashift:SI (reg:SI 4 R4 [orig:87 x$0 ] [87])
            (const_int 1 [0x1]))) "t.c":44:47# {*ashlsi3_insn}
     (nil))

(insn:SI # # # 6 (set (reg:SI 2 R2)
        (mem/c:SI (plus:SI (reg/f:SI 14 SP)
                (const_int 8 [0x8])) [4 %sfp+-4 S4 A32])) "t.c":44:47#
{*movsi_insn}
     (nil))

(insn:QI # # # 6 (unspec [
            (const_int 0 [0])
        ] 12) "t.c":44:47# {forced_nop}
     (nil))

(insn:TI # # # 6 (set (reg:SI 6 R6)
        (reg:SI 19 I3 [165])) "t.c":44:53# {*movsi_insn}
     (nil))

While with -g, it is not there:
(insn:TI # # # 6 (set (reg:SI 3 R3 [177])
        (ashift:SI (reg:SI 4 R4 [orig:87 x$0 ] [87])
            (const_int 1 [0x1]))) "t.c":44:47# {*ashlsi3_insn}
     (nil))

(debug_insn # # # 6 (var_location:SI D#14 (ior:SI (reg:SI 3 R3 [177])
        (const_int 31 [0x1f])))#
     (nil))

(insn # # # 6 (set (reg:SI 2 R2)
        (mem/c:SI (plus:SI (reg/f:SI 14 SP)
                (const_int 8 [0x8])) [4 %sfp+-4 S4 A32])) "t.c":45:14#
{*movsi_insn}
     (nil))

(insn:TI # # # 6 (set (reg:SI 6 R6)
        (reg:SI 19 I3 [165])) "t.c":44:53# {*movsi_insn}
     (nil))=