http://llvm.org/bugs/show_bug.cgi?id=10700
Summary: [x86 disassembler] arpl should not be possible with
64-bit target
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
From the "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 2 (2A & 2B): Instruction Set Reference, A-Z", p. 3-75:
ARPL—Adjust RPL Field of Segment Selector
63 /r
"This instruction executes as described in compatibility mode and legacy mode.
It is not encodable in 64-bit mode."
P. 3-730 shows the encoding in 64-bit mode:
MOVSX/MOVSXD—Move with Sign-Extension
REX.W** + 63 /r
With llvm-mc built from trunk revision 135913:
$ echo '0x63 0xc0'| ./llvm-mc -disassemble -triple="x86_64"
arpl %ax, %ax
With the 64-bit target set, this should have disassembled as 'movsx'.
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