From 47027494566cf62a7fa3583701fec2cd68c6b8ff Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Mon, 12 Jun 2006 18:55:44 +0000 Subject: gas/ 2006-06-12 H.J. Lu * config/tc-i386.c (process_suffix): Don't add rex64 for "xchg %rax,%rax". gas/testsuite/ 2006-06-12 H.J. Lu * 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 * i386.h (i386_optab): Update comment for 64bit NOP. opcodes/ 2006-06-12 H.J. Lu * i386-dis.c (NOP_Fixup): Removed. (NOP_Fixup1): New. (NOP_Fixup2): Likewise. (dis386): Use NOP_Fixup1 and NOP_Fixup2 on 0x90. --- include/opcode/ChangeLog | 4 ++++ include/opcode/i386.h | 10 +--------- 2 files changed, 5 insertions(+), 9 deletions(-) (limited to 'include') 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 + + * i386.h (i386_optab): Update comment for 64bit NOP. + 2006-06-06 Ben Elliston Anton Blanchard 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 } }, -- cgit v1.2.1