http://sourceware.org/bugzilla/show_bug.cgi?id=13571
Bug #: 13571
Summary: objdump incorrectly disassembles 'movnti' as using
'QWORD PTR'
Product: binutils
Version: 2.23 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
AssignedTo: unassig...@sourceware.org
ReportedBy: m...@mythic-beasts.com
Classification: Unclassified
"objdump -M intel -d" produces the following disassembly for x86-32:
0: 0f c3 00 movnti QWORD PTR [eax],eax
This should be "DWORD PTR" rather than "QWORD PTR".
For comparison, the assembler gets this right and accepts "DWORD PTR" but not
"QWORD PTR":
$ cat binutils_bug.S
.intel_syntax noprefix
movnti DWORD PTR [eax], eax
movnti QWORD PTR [eax], eax
$ as --32 binutils_bug.S -o binutils_bug.o
binutils_bug.S: Assembler messages:
binutils_bug.S:3: Error: ambiguous operand size or operands invalid for
`movnti'
The AMD manual specifies the instruction as follows:
MOVNTI mem32, reg32 0F C3 /r
MOVNTI mem64, reg64 0F C3 /r
This happens with binutils 2.20.1 and with HEAD (as of today).
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