Intel Itanium 9150M, Manual

Page: 396 / 420

Volume 3: Resource and Dependency Semantics 3:387
5.3.4 WAR Dependency Table
A general rule specific to the WAR table:
1. WAR dependencies are always allowed within instruction groups except for the
entry in Table 5-4 below. The readers and subsequent writers specified must be
separated by a stop in order to have defined behavior.
5.3.5 Listing of Rules Referenced in Dependency Tables
The following rules restrict the specific instances in which some of the instructions in
the tables cause a dependency and must be applied where referenced to correctly
interpret those entries. Rules only apply to the instance of the instruction class, or
instruction mnemonic prefix where the rule is referenced as a superscript. If the rule is
referenced in
Table 5-5 where instruction classes are defined, then it applies to all
instances of the instruction class.
Rule 1. These instructions only write a register when that register’s number is explicitly
encoded as a target of the instruction and is only read when it is encoded as a
source of the instruction (or encoded as its PR[qp]).
PSR.mfh fr-writers
9
none
user-mask-writers-partial
7
,
mov-to-PSR-um , fr-writers
9
,
sys-mask-writers-partial
7
,
mov-to-PSR-l , rfi
user-mask-writers-partial
7
,
mov-to-PSR-um ,
sys-mask-writers-partial
7
,
mov-to-PSR-l , rfi
impliedF
PSR.mfl fr-writers
9
none
user-mask-writers-partial
7
,
mov-to-PSR-um , fr-writers
9
,
sys-mask-writers-partial
7
,
mov-to-PSR-l , rfi
user-mask-writers-partial
7
,
mov-to-PSR-um ,
sys-mask-writers-partial
7
,
mov-to-PSR-l , rfi
impliedF
PSR.pk sys-mask-writers-partial
7
, mov-to-PSR-l , rfi impliedF
PSR.pp sys-mask-writers-partial
7
, mov-to-PSR-l , rfi impliedF
PSR.ri rfi impliedF
PSR.rt mov-to-PSR-l , rfi impliedF
PSR.si sys-mask-writers-partial
7
, mov-to-PSR-l , rfi impliedF
PSR.sp sys-mask-writers-partial
7
, mov-to-PSR-l , rfi impliedF
PSR.ss rfi impliedF
PSR.tb mov-to-PSR-l , rfi impliedF
PSR.up user-mask-writers-partial
7
, mov-to-PSR-um ,
sys-mask-writers-partial
7
, mov-to-PSR-l , rfi
impliedF
PSR.vm rfi, vmsw impliedF
RR# mov-to-IND-RR
6
impliedF
RSE rse-writers
14
impliedF
Table 5-4. WAR Dependencies Organized by Resource
Resource Name Readers Writers Semantics of Dependency
PR63 pr-readers-br
1
mod-sched-brs stop
Table 5-3. WAW Dependencies Organized by Resource (Continued)
Resource Name Writers
Semantics of
Dependency