[Bug binutils/23109] New: aarch64: opcode wrongly disassembled as sdot

[i-sourceware-org-2018-2p98rzwefkh at rf dot risimo.net]

https://sourceware.org/bugzilla/show_bug.cgi?id=23109

Bug ID: 23109
Summary: aarch64: opcode wrongly disassembled as sdot
Product: binutils
Version: 2.30
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: i-sourceware-org-2018-2p98rzwefkh at rf dot risimo.net
Target Milestone: ---

This is about the opcode 0fbcef26 which is disassembled as sdot.

$ hexdump bin2
0000000 26 ef bc 0f
0000004
$ objdump -D -b binary -maarch64 -Mno-aliases bin2

bin2: file format binary


Disassembly of section .data:

0000000000000000 <.data>:
0: 0fbcef26 sdot v6.2s, v25.8b, v28.4b[3]
$

The opcode in question:

33222222 22221111 111111
10987654 32109876 54321098 76543210
opcode = 00001111 10111100 11101111 00100110 = 0x08fbcef26

According to the docu I have here the 10th bit should be 0 but it is 1 in the
opcode. Therefore the opcode should be rejected.

[tnfchris at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23109

Tamar Christina <tnfchris at sourceware dot org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-05-15
CC| |tnfchris at sourceware dot org
Ever confirmed|0 |1

[tnfchris at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23109

Tamar Christina <tnfchris at sourceware dot org> changed:

What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at sourceware dot org |tnfchris at sourceware dot org