https://sourceware.org/bugzilla/show_bug.cgi?id=20838
--- Comment #2 from James Michael DuPont <jamesmikedupont at googlemail dot
com> ---
It did not disasm the first instruction as a byte, it subsumed it, the 4d is
lost.
Here are some permutations over the data bytes with different lengths and
values to show what is outputted.
Also the output "rex.WRB add %r8b,(%r8)" does not compile with gas.
a.out: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.test1>:
0: 4d rex.WRB
0000000000000003 <.test3>:
3: 4d 00 00 rex.WRB add %r8b,(%r8)
0000000000000015 <.test7>:
15: 4d 00 00 rex.WRB add %r8b,(%r8)
18: 00 00 add %al,(%rax)
1a: 01 .byte 0x1
000000000000001b <.test8>:
1b: 4d 00 00 rex.WRB add %r8b,(%r8)
1e: 00 01 add %al,(%rcx)
0000000000000030 <.test12>:
30: 4d 00 00 rex.WRB add %r8b,(%r8)
33: 01 00 add %eax,(%rax)
000000000000003b <.test14>:
3b: 4d 00 00 rex.WRB add %r8b,(%r8)
3e: 01 00 add %eax,(%rax)
40: 01 .byte 0x1
0000000000000041 <.test15>:
41: 4d 00 00 rex.WRB add %r8b,(%r8)
44: 01 01 add %eax,(%rcx)
000000000000004c <.test17>:
4c: 4d 00 00 rex.WRB add %r8b,(%r8)
4f: 01 01 add %eax,(%rcx)
51: 01 .byte 0x1
0000000000000052 <.test18>:
52: 4d 00 01 rex.WRB add %r8b,(%r9)
00000000000000a1 <.test33>:
a1: 4d rex.WRB
a2: 01 .byte 0x1
00000000000000a3 <.test34>:
a3: 4d 01 00 add %r8,(%r8)
00000000000000b5 <.test38>:
b5: 4d 01 00 add %r8,(%r8)
b8: 00 00 add %al,(%rax)
ba: 01 .byte 0x1
00000000000000bb <.test39>:
bb: 4d 01 00 add %r8,(%r8)
be: 00 01 add %al,(%rcx)
0000000000000141 <.test64>:
141: 4d rex.WRB
142: 02 .byte 0x2
0000000000000143 <.test65>:
143: 4d 02 00 rex.WRB add (%r8),%r8b
00000000000001e3 <.test96>:
1e3: 4d 03 00 add (%r8),%r8
0000000000000281 <.test126>:
281: 4d rex.WRB
282: 04 .byte 0x4
0000000000000283 <.test127>:
283: 4d 04 00 rex.WRB add $0x0,%al
0000000000000295 <.test131>:
295: 4d 04 00 rex.WRB add $0x0,%al
298: 00 00 add %al,(%rax)
29a: 01 .byte 0x1
0000000000000321 <.test157>:
321: 4d rex.WRB
322: 05 .byte 0x5
000000000000032f <.test161>:
32f: 4d 05 00 00 00 00 rex.WRB add $0x0,%rax
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