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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/107103] New: '-fcompare-debug' failure w/ -mcpu=power4
 -O1 -fschedule-insns -funroll-all-loops -fno-sched-pressure --param
 max-sched-ready-insns=1
Date: Fri, 30 Sep 2022 16:39:00 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: compare-debug-failure
X-Bugzilla-Severity: normal
X-Bugzilla-Who: asolokha at gmx dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107103

            Bug ID: 107103
           Summary: '-fcompare-debug' failure w/ -mcpu=3Dpower4 -O1
                    -fschedule-insns -funroll-all-loops
                    -fno-sched-pressure --param max-sched-ready-insns=3D1
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: compare-debug-failure
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: powerpc-*-linux-gnu

gcc 13.0.0 20220925 snapshot (g:77bbf69d2981dafc2ef3e59bfbefb645d88bab9d) f=
ails
-fcompare-debug check when compiling the following testcase, reduced from
gcc/testsuite/g++.target/powerpc/pr65240-1.C, w/ -mcpu=3Dpower4 -O1
-fschedule-insns -funroll-all-loops -fno-sched-pressure --param
max-sched-ready-insns=3D1:

int *p;
int n;

int
bar (int);

void
foo (int x)
{
  for (;;)
    if (x)
      p[n] =3D bar (x);
}

% powerpc-e300c3-linux-gnu-gcc-13.0.0 -mcpu=3Dpower4 -O1 -fcompare-debug
-fschedule-insns -funroll-all-loops -fno-sched-pressure --param
max-sched-ready-insns=3D1 -c ke3djyoc.c
powerpc-e300c3-linux-gnu-gcc-13.0.0: error: ke3djyoc.c: '-fcompare-debug'
failure

--- ke3djyoc.c.gkd      2022-09-30 23:33:02.202245982 +0700
+++ ke3djyoc.gk.c.gkd   2022-09-30 23:33:02.218245953 +0700
@@ -102,16 +102,16 @@
 (code_label # 0 0 19 (nil) [8 uses])
 (note # 0 0 [bb 3] NOTE_INSN_BASIC_BLOCK)
 (note # 0 0 NOTE_INSN_DELETED)
+(insn # 0 0 (set (reg/f:SI 30 30 [orig:131 p ] [131])
+        (mem/f/c:SI (lo_sum:SI (reg/f:SI 27 27 [126])
+                (symbol_ref:SI ("p") [flags 0x86]  <var_decl # p>)) [ p+0 =
S4
A32])) "ke3djyoc.c":12:8# {*movsi_internal1}
+     (nil))
 (insn # 0 0 (set (reg:SI 31 31 [orig:130 n ] [130])
         (mem/c:SI (lo_sum:SI (reg/f:SI 28 28 [128])
                 (symbol_ref:SI ("n") [flags 0x86]  <var_decl # n>)) [ n+0 =
S4
A32])) "ke3djyoc.c":12:8# {*movsi_internal1}
      (expr_list:REG_EQUIV (mem/c:SI (lo_sum:SI (reg/f:SI 28 28 [128])
                 (symbol_ref:SI ("n") [flags 0x86]  <var_decl # n>)) [ n+0 =
S4
A32])
         (nil)))
-(insn # 0 0 (set (reg/f:SI 30 30 [orig:131 p ] [131])
-        (mem/f/c:SI (lo_sum:SI (reg/f:SI 27 27 [126])
-                (symbol_ref:SI ("p") [flags 0x86]  <var_decl # p>)) [ p+0 =
S4
A32])) "ke3djyoc.c":12:8# {*movsi_internal1}
-     (nil))
 (insn # 0 0 (set (reg:SI 3 3)
         (reg/v:SI 29 29 [orig:123 x ] [123])) "ke3djyoc.c":12:14#
{*movsi_internal1}
      (nil))=