diff options
Diffstat (limited to 'gas/config/tc-i386.c')
| -rw-r--r-- | gas/config/tc-i386.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/gas/config/tc-i386.c b/gas/config/tc-i386.c index 16376dccdf..0f6396ff03 100644 --- a/gas/config/tc-i386.c +++ b/gas/config/tc-i386.c @@ -3032,11 +3032,17 @@ process_suffix (void) && (i.tm.opcode_modifier & NoRex64) == 0) { /* Special case for xchg %rax,%rax. It is NOP and doesn't - need rex64. */ - if (i.operands != 2 - || i.types [0] != (Acc | Reg64) - || i.types [1] != (Acc | Reg64) - || i.tm.base_opcode != 0x90) + need rex64. cmpxchg8b is also a special case. */ + if (! (i.operands == 2 + && i.tm.base_opcode == 0x90 + && i.tm.extension_opcode == None + && i.types [0] == (Acc | Reg64) + && i.types [1] == (Acc | Reg64)) + && ! (i.operands == 1 + && i.tm.base_opcode == 0xfc7 + && i.tm.extension_opcode == 1 + && (i.types [0] & Reg) == 0 + && (i.types [0] & AnyMem) != 0)) i.rex |= REX_W; } |