https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97431
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2020-10-15
Status|UNCONFIRMED |NEW
--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #3)
> r11 0x5 5
> r12 0x299f367c 698300028
> r13 0x8b8 2232
> r14 0x2a15f4a0 706081952
>
> Disassembled function:
>
> Dump of assembler code for function long_richcompare:
> 0x29631850 <+0>: mov.l r8,@-r15
> 0x29631852 <+2>: mova 0x296318e8 <long_richcompare+152>,r0
> 0x29631854 <+4>: mov.l r12,@-r15
> 0x29631856 <+6>: mov.l @(4,r4),r1
> 0x29631858 <+8>: mov.l 0x296318e8 <long_richcompare+152>,r12 !
> 0x3c1d94
> 0x2963185a <+10>: add #64,r1
> 0x2963185c <+12>: mov.l @(20,r1),r2
> 0x2963185e <+14>: mov.l 0x296318ec <long_richcompare+156>,r1 !
> 0x1000000
> 0x29631860 <+16>: tst r1,r2
> 0x29631862 <+18>: bt.s 0x296318d8 <long_richcompare+136>
> 0x29631864 <+20>: add r0,r12
> 0x29631866 <+22>: mov.l @(4,r5),r2
> 0x29631868 <+24>: add #64,r2
> 0x2963186a <+26>: mov.l @(20,r2),r2
> 0x2963186c <+28>: tst r1,r2
> 0x2963186e <+30>: bt.s 0x296318d8 <long_richcompare+136>
> 0x29631870 <+32>: cmp/eq r5,r4
> 0x29631872 <+34>: bt.s 0x29631940 <long_richcompare+240>
> 0x29631874 <+36>: mov #5,r1
> 0x29631876 <+38>: mov.l @(8,r4),r7
> 0x29631878 <+40>: mov.l @(8,r5),r1
> 0x2963187a <+42>: mov r7,r8
> 0x2963187c <+44>: cmp/eq r1,r7
> 0x2963187e <+46>: bf.s 0x296318e8 <long_richcompare+152>
> 0x29631880 <+48>: sub r1,r8
>
> ....
>
> 0x296318e6 <+150>: mov.l @r15+,r8
> => 0x296318e8 <+152>: mov.l r9,@(16,r13)
Just to point out the obvious, r13 is never initialized nor referenced by
anything else throughout the function. What are the compiler options?
