https://sourceware.org/bugzilla/show_bug.cgi?id=22464
Bug ID: 22464
Summary: x86 gas -n option does not work
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: wilson at gcc dot gnu.org
Target Milestone: ---
I noticed this by accident. The x86 assembler has a -n option which says to
emit one byte nops instead of multi-byte nops. But when I try it, it doesn't
work.
rohan:2162$ cat tmp.s
.text
movl %edi, %eax
.balign 8
movl $0, %edx
.balign 8
.section ".text.alt"
movl %edi, %eax
rohan:2163$ as tmp.s
rohan:2164$ objdump -d a.out
a.out: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 89 f8 mov %edi,%eax
2: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
8: ba 00 00 00 00 mov $0x0,%edx
d: 0f 1f 00 nopl (%rax)
Disassembly of section .text.alt:
0000000000000000 <.text.alt>:
0: 89 f8 mov %edi,%eax
rohan:2165$
This option was introduced in binutils-2.15. When I try building that, I see
that it doesn't work there either. Which means it appears that the x86 gas -n
option has never worked in a release.
I'm willing to submit a patch to remove it, but if you want it to work, someone
else will have to fix it.
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