https://sourceware.org/bugzilla/show_bug.cgi?id=32624
Jan Beulich <jbeulich at suse dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |NEW
--- Comment #6 from Jan Beulich <jbeulich at suse dot com> ---
(In reply to H.J. Lu from comment #5)
> x: file format elf32-i386
>
>
> Disassembly of section .text:
>
> 08048074 <_start>:
> 8048074: 8d 05 fc ff ff ff lea 0xfffffffc,%eax
> 804807a: 8d 04 25 00 90 04 08 lea 0x8049000(,%eiz,1),%eax
This should match the earlier LEA.
> 8048081: 81 c0 10 90 04 08 add $0x8049010,%eax
> 8048087: 03 04 25 00 90 04 08 add 0x8049000(,%eiz,1),%eax
If the former "add" is transformed, the latter should be, too.
> 804808e: 0f ba 25 00 90 04 08 1f btl $0x1f,0x8049000
> 8048096: 0f ba 24 25 00 90 04 08 1f btl $0x1f,0x8049000(,%eiz,1)
> 804809f: 62 f2 75 48 8d 05 fc ff ff ff vpermb 0xfffffffc,%zmm1,%zmm0
This wrongly was transformed as if it was LEA; the instruction is almost
certainly going to fault when executed (unless, oddly, something is mapped at
the topmost page of the address space). It should remain untouched just like
...
> 80480a9: 62 f2 75 48 8d 04 25 00 90 04 08 vpermb
> 0x8049000(,%eiz,1),%zmm1,%zmm0
... this one.
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