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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.
This commit is contained in:
H.J. Lu 2006-06-12 18:55:42 +00:00
parent 313b51e6c1
commit 2d853d0e39
2 changed files with 5 additions and 9 deletions
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4
include/opcode/ChangeLog
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@ -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>

10
include/opcode/i386.h
View File

@ -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 } },