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GPU/Shader Instruction Set: Difference between revisions

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comp ops
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|  1c
|  1c
|  CMP
|  CMP
|  Sets booleans cmp.x and cmp.y based on the operand's x and y components and the CMPX and CMPY comparison operators respectively.
|  Sets booleans cmp.x and cmp.y based on the operand's x and y components and the CMPX and CMPY comparison operators respectively. See [[#Comparison_operator|below]] for details about operators.
|-
|-
|  0x38-0x3F
|  0x38-0x3F
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a0 and a1 can be set manually through the ARL instruction. lcnt is set automatically by the LOOP instruction. Note that lcnt is still accessible and valid after exiting a LOOP block.
a0 and a1 can be set manually through the ARL instruction. lcnt is set automatically by the LOOP instruction. Note that lcnt is still accessible and valid after exiting a LOOP block.
== Comparison operator ==
{| class="wikitable" border="1"
|-
!  CMPX/CMPY raw value
!  Operator name
!  Expression
|-
|  0x0
|  EQ
|  src1 == src2
|-
|  0x1
|  NE
|  src1 != src2
|-
|  0x2
|  LT
|  src1 < src2
|-
|  0x3
|  LE
|  src1 <= src2
|-
|  0x4
|  GT
|  src1 > src2
|-
|  0x5
|  GE
|  src1 >= src2
|-
|  0x6
|  ??
|  true ?
|-
|  0x7
|  ??
|  true ?
|}
6 and 7 seem to always return true.


== Conditions ==
== Conditions ==
Retrieved from "https://www.3dbrew.org/wiki/GPU/Shader_Instruction_Set"