diff options
| author | H.J. Lu <hjl@lucon.org> | 2006-06-12 18:55:44 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@lucon.org> | 2006-06-12 18:55:44 +0000 |
| commit | 47027494566cf62a7fa3583701fec2cd68c6b8ff (patch) | |
| tree | d7de54026a6348a727ae8bb4e5edca451c4745e5 /include/opcode | |
| parent | a64abfed593f552156806dc8749c383bc6ec915d (diff) | |
| download | gdb-47027494566cf62a7fa3583701fec2cd68c6b8ff.tar.gz | |
gas/
2006-06-12 H.J. Lu <hongjiu.lu@intel.com>
* config/tc-i386.c (process_suffix): Don't add rex64 for
"xchg %rax,%rax".
gas/testsuite/
2006-06-12 H.J. Lu <hongjiu.lu@intel.com>
* gas/i386/opcode.s: Add "xchg %ax,%ax".
* gas/i386/opcode.d: Updated.
* gas/i386/x86-64-opcode.s: Add xchg %ax,%ax, xchg %eax,%eax,
xchg %rax,%rax, rex64 xchg %rax,%rax and xchg %rax,%r8.
* gas/i386/x86-64-opcode.d: Updated.
include/opcode/
2006-06-12 H.J. Lu <hongjiu.lu@intel.com>
* i386.h (i386_optab): Update comment for 64bit NOP.
opcodes/
2006-06-12 H.J. Lu <hongjiu.lu@intel.com>
* i386-dis.c (NOP_Fixup): Removed.
(NOP_Fixup1): New.
(NOP_Fixup2): Likewise.
(dis386): Use NOP_Fixup1 and NOP_Fixup2 on 0x90.
Diffstat (limited to 'include/opcode')
| -rw-r--r-- | include/opcode/ChangeLog | 4 | ||||
| -rw-r--r-- | include/opcode/i386.h | 10 |
2 files changed, 5 insertions, 9 deletions
diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog index ab1793efd59..edc00fa6dee 100644 --- a/include/opcode/ChangeLog +++ b/include/opcode/ChangeLog @@ -1,3 +1,7 @@ +2006-06-12 H.J. Lu <hongjiu.lu@intel.com> + + * i386.h (i386_optab): Update comment for 64bit NOP. + 2006-06-06 Ben Elliston <bje@au.ibm.com> Anton Blanchard <anton@samba.org> diff --git a/include/opcode/i386.h b/include/opcode/i386.h index 2b2c1e0f979..c46c86d4c1d 100644 --- a/include/opcode/i386.h +++ b/include/opcode/i386.h @@ -179,19 +179,11 @@ static const template i386_optab[] = /* Exchange instructions. xchg commutes: we allow both operand orders. - In the 64bit code, xchg eax, eax is reused for new nop instruction. */ -#if 0 /* While the two entries that are disabled generate shorter code - for xchg eax, reg (on x86_64), the special case xchg eax, eax - does not get handled correctly - it degenerates into nop, but - that way the side effect of zero-extending eax to rax is lost. */ -{"xchg", 2, 0x90, X, 0, wlq_Suf|ShortForm, { WordReg, Acc, 0 } }, -{"xchg", 2, 0x90, X, 0, wlq_Suf|ShortForm, { Acc, WordReg, 0 } }, -#else + In the 64bit code, xchg rax, rax is reused for new nop instruction. */ {"xchg", 2, 0x90, X, CpuNo64, wl_Suf|ShortForm, { WordReg, Acc, 0 } }, {"xchg", 2, 0x90, X, CpuNo64, wl_Suf|ShortForm, { Acc, WordReg, 0 } }, {"xchg", 2, 0x90, X, Cpu64, wq_Suf|ShortForm, { Reg16|Reg64, Acc, 0 } }, {"xchg", 2, 0x90, X, Cpu64, wq_Suf|ShortForm, { Acc, Reg16|Reg64, 0 } }, -#endif {"xchg", 2, 0x86, X, 0, bwlq_Suf|W|Modrm, { Reg, Reg|AnyMem, 0 } }, {"xchg", 2, 0x86, X, 0, bwlq_Suf|W|Modrm, { Reg|AnyMem, Reg, 0 } }, |