diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2007-11-12 22:55:27 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2007-11-12 22:56:07 -0800 |
| commit | bb72f7f111abe0e01081506caa11afdf37b95857 (patch) | |
| tree | 8a7e6b8fdca3c24701cb95fb93ed82304b509ffa /test/nop.asm | |
| parent | fb0c90cdbeb63e08ffeaa5377b13e5c7743cec00 (diff) | |
| download | nasm-bb72f7f111abe0e01081506caa11afdf37b95857.tar.gz | |
Un-special-case "xchg rax,rax"; disassemble o64
Un-special-case "xchg rax,rax"; allow it to be encoded as 48 90 for
orthogonality's sake. It's a no-op, to be sure, but so are many other
instructions.
"xchg eax,eax" is still special-cased in 64-bit mode since it is not a
no-op; unadorned opcode 90 is now simply "nop" and nothing else.
Make the disassembler detect unused REX.W and display them as an "o64"
prefix.
Diffstat (limited to 'test/nop.asm')
| -rw-r--r-- | test/nop.asm | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/test/nop.asm b/test/nop.asm new file mode 100644 index 00000000..3dabaa07 --- /dev/null +++ b/test/nop.asm @@ -0,0 +1,14 @@ + bits 64 + + nop + o64 nop + pause + o64 pause + + xchg ax,ax + xchg eax,eax + xchg rax,rax + + rep xchg ax,ax + rep xchg eax,eax + rep xchg rax,rax |