assemble.c: Don't drop rex prefix from instruction itself
emit_rex is supposed to write REX prefix into output stream
if needed, but we happen to drop it off on a first write
which breaks REX required instructions if TIMES directive
is used.
For example the code like
| times 4 movq xmm11, xmm11
compiles into
|
0000000000000000 <.text>:
| 0: f3 45 0f 7e db movq %xmm11,%xmm11
| 5: f3 0f 7e db movq %xmm3,%xmm3
| 9: f3 0f 7e db movq %xmm3,%xmm3
| d: f3 0f 7e db movq %xmm3,%xmm3
instead of proper
|
0000000000000000 <.text>:
| 0: f3 45 0f 7e db movq %xmm11,%xmm11
| 5: f3 45 0f 7e db movq %xmm11,%xmm11
| a: f3 45 0f 7e db movq %xmm11,%xmm11
| f: f3 45 0f 7e db movq %xmm11,%xmm11
http://bugzilla.nasm.us/show_bug.cgi?id=
3392278
Reported-by: Javier <elpochodelagente@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>