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Line 167:
Line 167: − + − + Line 646:
Line 646: − + Line 655:
Line 655: − + − + − + − + − − For example, with CONDOP=1, NEGX=1 and NEGY=0, the resulting expression would be (cmp.x && !cmp.y).
These are reference values, not negations...
| 0x18
| 0x18
| 0x1
| 0x1
| Y negation bit (NEGY)
| Y reference bit (REFY)
|-
|-
| 0x19
| 0x19
| 0x1
| 0x1
| X negation bit (NEGX)
| X reference bit (REFX)
|-
|-
| 0x1A
| 0x1A
A number of format 2 instructions are executed conditionally. These conditions are based on two boolean registers which can be set with CMP : cmp.x and cmp.y.
A number of format 2 instructions are executed conditionally. These conditions are based on two boolean registers which can be set with CMP : cmp.x and cmp.y.
Conditional instructions include 3 parameters : CONDOP, NEGX and NEGY. NEGX and NEGY determine whether the conditional expression will use cmp.x or !cmp.x, and cmp.y or !cmp.y respectively (NEGX set means we use cmp.x, and NEGX not set means we use !cmp.x). CONDOP describes the actual expression. There are four conditional expression formats :
Conditional instructions include 3 parameters : CONDOP, REFX and REFY. REFX and REFY are reference values which are tested for equality against cmp.x and cmp.y, respectively. CONDOP describes how the final truth value is constructed from the results of the two tests. There are four conditional expression formats :
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
| 0x0
| 0x0
| <nowiki>[!]cmp.x || [!]cmp.y</nowiki>
| <nowiki>cmp.x == REFX || cmp.y == REFY</nowiki>
| OR
| OR
|-
|-
| 0x1
| 0x1
| <nowiki>[!]cmp.x && [!]cmp.y</nowiki>
| <nowiki>cmp.x == REFX && cmp.y == REFY</nowiki>
| AND
| AND
|-
|-
| 0x2
| 0x2
| [!]cmp.y
| cmp.y == REFY
| Y
| Y
|-
|-
| 0x3
| 0x3
| [!]cmp.x
| cmp.x == REFX
| X
| X
|}
|}
== Registers ==
== Registers ==