I try to understand...

Surac

Reading the Instruction set of the P2 i have found something i can't find any documentation about

EEEE 0100000 CZI DDDDDDDDD SSSSSSSSS TESTB D,S/# WC/WZ
EEEE 0100001 CZI DDDDDDDDD SSSSSSSSS TESTBN D,S/# WC/WZ
EEEE 0100010 CZI DDDDDDDDD SSSSSSSSS TESTB D,S/# ANDC/ANDZ
EEEE 0100011 CZI DDDDDDDDD SSSSSSSSS TESTBN D,S/# ANDC/ANDZ
EEEE 0100100 CZI DDDDDDDDD SSSSSSSSS TESTB D,S/# ORC/ORZ
EEEE 0100101 CZI DDDDDDDDD SSSSSSSSS TESTBN D,S/# ORC/ORZ
EEEE 0100110 CZI DDDDDDDDD SSSSSSSSS TESTB D,S/# XORC/XORZ
EEEE 0100111 CZI DDDDDDDDD SSSSSSSSS TESTBN D,S/# XORC/XORZ

So, if i write TESTB or TESTBN, how does the compiler determine which to use?

EEEE 1101011 CZL DDDDDDDDD 001000000 TESTP D/# WC/WZ
EEEE 1101011 CZL DDDDDDDDD 001000001 TESTPN D/# WC/WZ
EEEE 1101011 CZL DDDDDDDDD 001000010 TESTP D/# ANDC/ANDZ
EEEE 1101011 CZL DDDDDDDDD 001000011 TESTPN D/# ANDC/ANDZ
EEEE 1101011 CZL DDDDDDDDD 001000100 TESTP D/# ORC/ORZ
EEEE 1101011 CZL DDDDDDDDD 001000101 TESTPN D/# ORC/ORZ
EEEE 1101011 CZL DDDDDDDDD 001000110 TESTP D/# XORC/XORZ
EEEE 1101011 CZL DDDDDDDDD 001000111 TESTPN D/# XORC/XORZ

• shouldn't WC/WZ be written as {WC/WZ}?
• How does the compiler determine how to encode the instruction?

Do i have to write something special behind the instruction to tell if i want AND OR, XOR?

Does it work like wc wz wcz behind the instruction?

evanh

@Surac said:
Do i have to write something special behind the instruction to tell if i want AND OR, XOR?

Does it work like wc wz wcz behind the instruction?

Yes, for those instructions, the WC/ANDC/ORC/XORC encodings are all the same "C" bit (#20) and WZ/ANDZ/ORZ/XORZ are all the same "Z" bit (#19).

evanh

The reason why there is no {} braces is because it is mandatory to use exactly one option. Most instructions it is optional to use any.

TonyB_

TESTBx and BITx share the same opcodes, except for C & Z bits. Similarly for TESTPx and DIRx.

TESTBx  D,S/#   WC/ANDC/ORC/XORC    'CZ=10
TESTBx  D,S/#   WZ/ANDZ/ORZ/XORZ    'CZ=01
BITx    D,S/#                       'CZ=00
BITx    D,S/#   WCZ                 'CZ=11

ozpropdev

Here's a complete list of the TESTP/n encodings.

EEEE 0100000 00I DDDDDDDDD SSSSSSSSS        BITL    D,S/#
EEEE 0100000 01I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       WZ
EEEE 0100000 10I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       WC
EEEE 0100000 11I DDDDDDDDD SSSSSSSSS        BITL    D,S/#       WCZ

EEEE 0100001 00I DDDDDDDDD SSSSSSSSS        BITH    D,S/#
EEEE 0100001 01I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       WZ
EEEE 0100001 10I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       WC
EEEE 0100001 11I DDDDDDDDD SSSSSSSSS        BITH    D,S/#       WCZ

EEEE 0100010 00I DDDDDDDDD SSSSSSSSS        BITC    D,S/#
EEEE 0100010 01I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       ANDZ
EEEE 0100010 10I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       ANDC
EEEE 0100010 11I DDDDDDDDD SSSSSSSSS        BITC    D,S/#       WCZ

EEEE 0100011 00I DDDDDDDDD SSSSSSSSS        BITNC   D,S/#
EEEE 0100011 01I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       ANDZ
EEEE 0100011 10I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       ANDC
EEEE 0100011 11I DDDDDDDDD SSSSSSSSS        BITNC   D,S/#       WCZ

EEEE 0100100 00I DDDDDDDDD SSSSSSSSS        BITZ    D,S/#
EEEE 0100100 01I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       ORZ
EEEE 0100100 10I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       ORC
EEEE 0100100 11I DDDDDDDDD SSSSSSSSS        BITZ    D,S/#       WCZ

EEEE 0100101 00I DDDDDDDDD SSSSSSSSS        BITNZ   D,S/#
EEEE 0100101 01I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       ORZ
EEEE 0100101 10I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       ORC
EEEE 0100101 11I DDDDDDDDD SSSSSSSSS        BITNZ   D,S/#       WCZ

EEEE 0100110 00I DDDDDDDDD SSSSSSSSS        BITRND  D,S/#
EEEE 0100110 01I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       XORZ
EEEE 0100110 10I DDDDDDDDD SSSSSSSSS        TESTB   D,S/#       XORC
EEEE 0100110 11I DDDDDDDDD SSSSSSSSS        BITRND  D,S/#       WCZ

EEEE 0100111 00I DDDDDDDDD SSSSSSSSS        BITNOT  D,S/#
EEEE 0100111 01I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       XORZ
EEEE 0100111 10I DDDDDDDDD SSSSSSSSS        TESTBN  D,S/#       XORC
EEEE 0100111 11I DDDDDDDDD SSSSSSSSS        BITNOT  D,S/#       WCZ

EEEE 1101011 00L DDDDDDDDD 001000000        DIRL    D/#
EEEE 1101011 01L DDDDDDDDD 001000000        TESTP   D/#         WZ
EEEE 1101011 10L DDDDDDDDD 001000000        TESTP   D/#         WC
EEEE 1101011 11L DDDDDDDDD 001000000        DIRL    D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000001        DIRH    D/#
EEEE 1101011 01L DDDDDDDDD 001000001        TESTPN  D/#         WZ
EEEE 1101011 10L DDDDDDDDD 001000001        TESTPN  D/#         WC
EEEE 1101011 11L DDDDDDDDD 001000001        DIRH    D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000010        DIRC    D/#
EEEE 1101011 01L DDDDDDDDD 001000010        TESTP   D/#         ANDZ
EEEE 1101011 10L DDDDDDDDD 001000010        TESTP   D/#         ANDC
EEEE 1101011 11L DDDDDDDDD 001000010        DIRC    D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000011        DIRNC   D/#         
EEEE 1101011 01L DDDDDDDDD 001000011        TESTPN  D/#         ANDZ
EEEE 1101011 10L DDDDDDDDD 001000011        TESTPN  D/#         ANDC
EEEE 1101011 11L DDDDDDDDD 001000011        DIRNC   D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000100        DIRZ    D/#
EEEE 1101011 01L DDDDDDDDD 001000100        TESTP   D/#         ORZ
EEEE 1101011 10L DDDDDDDDD 001000100        TESTP   D/#         ORC
EEEE 1101011 11L DDDDDDDDD 001000100        DIRZ    D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000101        DIRNZ   D/#
EEEE 1101011 01L DDDDDDDDD 001000101        TESTPN  D/#         ORZ
EEEE 1101011 10L DDDDDDDDD 001000101        TESTPN  D/#         ORC
EEEE 1101011 11L DDDDDDDDD 001000101        DIRNZ   D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000110        DIRRND  D/#
EEEE 1101011 01L DDDDDDDDD 001000110        TESTP   D/#         XORZ
EEEE 1101011 10L DDDDDDDDD 001000110        TESTP   D/#         XORC
EEEE 1101011 11L DDDDDDDDD 001000110        DIRRND  D/#         WCZ

EEEE 1101011 00L DDDDDDDDD 001000111        DIRNOT  D/#
EEEE 1101011 01L DDDDDDDDD 001000111        TESTPN  D/#         XORZ
EEEE 1101011 10L DDDDDDDDD 001000111        TESTPN  D/#         XORC
EEEE 1101011 11L DDDDDDDDD 001000111        DIRNOT  D/#         WCZ

Edit: Corrected DIRNC typos

Surac

Ahh,

Thank you for enlighten me

EEEE 1101011 00L DDDDDDDDD 001000011 DIRNC D/# {WCZ}

hmm i think there should not be a {WCZ}

EEEE 1101011 11L DDDDDDDDD 001000011 DIRNC D/# {WCZ}

and here it should say WCZ not {WCZ}

right?

evanh

Correct. Oz missed a couple.

ozpropdev

@Surac said:
Ahh,

Thank you for enlighten me

EEEE 1101011 00L DDDDDDDDD 001000011 DIRNC D/# {WCZ}

hmm i think there should not be a {WCZ}

EEEE 1101011 11L DDDDDDDDD 001000011 DIRNC D/# {WCZ}

and here it should say WCZ not {WCZ}

right?

@evanh said:
Correct. Oz missed a couple.

Oops!
I corrected the error, thanks guys.