[Bug gas/18631] New: avx512: wrong memory size for vcvtt?ps2u?qq instructions with data broadcast

[ram...@hex-rays.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18631

Bug ID: 18631
   Summary: avx512: wrong memory size for vcvtt?ps2u?qq
instructions with data broadcast
   Product: binutils
   Version: 2.26 (HEAD)
Status: NEW
  Severity: normal
  Priority: P2
 Component: gas
  Assignee: unassigned at sourceware dot org
  Reporter: ram...@hex-rays.com
  Target Milestone: ---

The vcvtps2qq, vcvtps2uqq, vcvttps2qq, and vcvttps2uqq instructions are
incorrectly defined regarding the memory operand size with data broadcast for
avx512. Simple example (with git master):

==
$ cat vcvtps2qq.s
.text
vcvtps2qq (%rax){1to8}, %zmm0
$ as-new -o vcvtps2qq.o vcvtps2qq.s
$ objdump -Mintel -d vcvtps2qq.o 

vcvtps2qq.o: file format elf64-x86-64


Disassembly of section .text:

 <.text>:
   0:   62 f1 7d 58 7b 00   vcvtps2qq zmm0,YMMWORD PTR [rax]{1to8}
==

It should be:

vcvtps2qq zmm0,DWORD PTR [rax]{1to8}

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[Bug gas/18631] avx512: wrong memory size for vcvtt?ps2u?qq instructions with data broadcast

[ram...@hex-rays.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18631

Ramiro Polla  changed:

   What|Removed |Added

 CC||ram...@hex-rays.com

--- Comment #1 from Ramiro Polla  ---
Created attachment 8418
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8418&action=edit
Simple patch that should fix the issue (without testcase updates)

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[Bug binutils/20637] New: 32-bit XOP instructions should silently ignore REX_B

[ram...@hex-rays.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20637

Bug ID: 20637
   Summary: 32-bit XOP instructions should silently ignore REX_B
   Product: binutils
   Version: 2.28 (HEAD)
Status: UNCONFIRMED
  Severity: normal
  Priority: P2
 Component: binutils
  Assignee: unassigned at sourceware dot org
  Reporter: ram...@hex-rays.com
  Target Milestone: ---

Created attachment 9523
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9523&action=edit
simple patch (no updates to changelog or testsuite)

32-bit XOP instructions should silently ignore REX_B (confirmed with Intel's
XED tool below)

$ hd xx.bin 
  8f c9 78 e2 4d c2 |..x.M.|
0006
$ xed -32 -ir xx.bin
XDIS 0: XOP   XOP8FC978E24DC2 vphsubwd xmm1, xmmword
ptr [ebp-0x3e]
$ objdump-bad -Mintel -mi386 -b binary -D xx.bin 

xx.bin: file format binary


Disassembly of section .data:

 <.data>:
   0:   8f c9 78 e2 4d c2   vphsubwd xmm1,XMMWORD PTR [r13d-0x3e]
$ objdump-good -Mintel -mi386 -b binary -D xx.bin 

xx.bin: file format binary


Disassembly of section .data:

 <.data>:
   0:   8f c9 78 e2 4d c2   vphsubwd xmm1,XMMWORD PTR [ebp-0x3e]

Simple patch attached (no updates to changelog or testsuite).

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[Bug binutils/20637] 32-bit XOP instructions should silently ignore REX_B

[ram...@hex-rays.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20637

--- Comment #4 from Ramiro Polla  ---
Hi Amit,

This sample comes from fuzzed data, hence why I provided the bytes directly.
The instruction is still valid, though, but with ebp as register (REX_B should
be silently ignored). Both XED and LLVM disassemble it correctly.

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