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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/103246] [12 Regression] 416.gamess miscompare with -O2 -g
 -flto=auto since r12-5223-gecdf414bd89e6ba251f6b3f494407139b4dbae0e
Date: Tue, 16 Nov 2021 20:53:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103246

--- Comment #10 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
I isolated small reproducer:

$ cat 1.f
      SUBROUTINE DENDD1(B,L2)
      IF(CITYPIPSI.EQ.1) CALL VADD(A1DB1DA,1,L2)
      END

$ cat 2.f
      LOGICAL BSFDD
      L2 =3D 2
      CALL DENDD1(X0X0,L2)
      IF(BSFDD) THEN=20
        CALL VCLR(X01NXYZ2*L2)
      CALL HFD(BSFDD)
      END IF
      END

$ cat cmd
FLAGS=3D"-O2 -flto=3D16 -flto-partition=3D1to1 -fPIC"

gfortran-11 *.f $FLAGS -c=20
gfortran-11 *.o $FLAGS -o gamess1 -shared $OBJ
gfortran-11 *.o $FLAGS -fdump-ipa-inline -o gamess2 -shared $OBJ
objdump -d gamess1 > gamess1.txt
objdump -d gamess2 > gamess2.txt
diff -u gamess1 gamess2

if test $? =3D 1; then
  exit 0
else
  exit 1
fi

$ ./cmd && diff gamess1.txt gamess2.txt
...
@@ -76,91 +76,88 @@
     10d8:      31 c0                   xor    %eax,%eax
     10da:      48 83 c4 18             add    $0x18,%rsp
     10de:      c3                      ret=20=20=20=20
-    10df:      66 0f ef c0             pxor   %xmm0,%xmm0
-    10e3:      48 8d 7c 24 0c          lea    0xc(%rsp),%rdi
-    10e8:      f3 0f 2a 44 24 04       cvtsi2ssl 0x4(%rsp),%xmm0
-    10ee:      f3 0f 59 05 26 0f 00    mulss  0xf26(%rip),%xmm0        # 2=
01c
<options.0.0+0x1c>
-    10f5:      00=20
-    10f6:      f3 0f 11 44 24 0c       movss  %xmm0,0xc(%rsp)
-    10fc:      e8 2f ff ff ff          call   1030 <vclr_@plt>
-    1101:      48 89 e7                mov    %rsp,%rdi
...

but this got fixed on master with r12-5223-gecdf414bd89e6ba2.

I'll try if it happens with the current master. Hope it helps.=