#BEGIN_LEGAL
#
#Copyright (c) 2019 Intel Corporation
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
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###########################################################################
## file: xed-eOSZ.txt
###########################################################################

OSZ_NONTERM()::

mode16 no66_prefix | EOSZ=1
mode16   66_prefix | EOSZ=2

mode32   66_prefix | EOSZ=1
mode32 no66_prefix | EOSZ=2

# NOTE this can get overridden later if a DF64 NT shows up.
mode64   66_prefix REXW=0 | EOSZ=1
mode64 no66_prefix REXW=0 | EOSZ=2
mode64   66_prefix REXW=1 | EOSZ=3
mode64 no66_prefix REXW=1 | EOSZ=3


# Things that default to 64b mode invoke this nonterminal once they
# are identified to denote that fact. Placement of this nonterminal is
# critical for those operations and the ones the might collide with
# during decoding. See PUSHF/PUSHFD/PUSHFQ.
#
# Denote the DF64=1 (df64).
DF64()::
mode16                     |
mode32                     |
mode64   66_prefix REXW=0  | EOSZ=1 df64
mode64 no66_prefix REXW=0  | EOSZ=3 df64
mode64   66_prefix REXW=1  | EOSZ=3 df64
mode64 no66_prefix REXW=1  | EOSZ=3 df64

# if we have a refining OSZ 0x66 prefix, then we must undo the effects
# of the OSZ_NONTERM(). DF64 is not used with anything that has refining 66 prefixes.
# We turn off the osze prefix because it is really behaving like a refining prefix for these instructions.
REFINING66()::
mode16        | EOSZ=1 no66_prefix
mode32        | EOSZ=2 no66_prefix
mode64 REXW=0 | EOSZ=2 no66_prefix
mode64 REXW=1 | EOSZ=3 no66_prefix

IGNORE66()::
mode16         | EOSZ=1 no66_prefix
mode32         | EOSZ=2 no66_prefix
mode64 REXW=0  | EOSZ=2 no66_prefix
mode64 REXW=1  | EOSZ=3 no66_prefix


# IMMUNE66() is used to make 16b mode behave like 32b mode.
# Used for:
#   cmpxchg8b / cmpxchg16b,
#   NHM sttni instr:  pcmpestri, pcmpistrm, pcmpestrm, pcmpistri,
#   BDW adox, adcx.
#
IMMUNE66()::
mode16          | EOSZ=2 no66_prefix
mode32          | EOSZ=2 no66_prefix
mode64 REXW=0   | EOSZ=2 no66_prefix
mode64 REXW=1   | EOSZ=3 no66_prefix

# Used for for CRs and DRs.
CR_WIDTH():: 
mode16  | EOSZ=2 DF32=1 no66_prefix
mode32  | EOSZ=2 DF32=1 no66_prefix
mode64  | EOSZ=3 DF64=1 no66_prefix


IMMUNE66_LOOP64()::
mode16  | 
mode32  | 
mode64  | EOSZ=3 no66_prefix

IMMUNE_REXW()::
mode16                   | 
mode32                   | 
mode64 no66_prefix       | EOSZ=2 
mode64 66_prefix REXW=1  | EOSZ=2
mode64 66_prefix REXW=0  | EOSZ=1

# FORCE64() can only be used with mode64 stuff (else encode does not
# work).  see IMMUNE66_LOOP64() for something that works in all modes.
FORCE64()::
mode64    | EOSZ=3 no66_prefix
otherwise |