Shibboleet: Created page with "''Paired Singles'' are a part of the Broadway / Gekko processor that allows for two single-precision floating point values to be stored in a single register. This allows for faster vector and matrix math. ''Paired Singles'' are handwritten assembly code; they cannot be generated by the compiler '''unless''' it is for pushing / popping the stack frame in a functions prologue or epilogue. The ''Super Mario Galaxy'' games do not use very many different paired single instruc..."

2025-02-16T23:16:21Z

Created page with "''Paired Singles'' are a part of the Broadway / Gekko processor that allows for two single-precision floating point values to be stored in a single register. This allows for faster vector and matrix math. ''Paired Singles'' are handwritten assembly code; they cannot be generated by the compiler '''unless''' it is for pushing / popping the stack frame in a functions prologue or epilogue. The ''Super Mario Galaxy'' games do not use very many different paired single instruc..."

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''Paired Singles'' are a part of the Broadway / Gekko processor that allows for two single-precision floating point values to be stored in a single register. This allows for faster vector and matrix math. ''Paired Singles'' are handwritten assembly code; they cannot be generated by the compiler '''unless''' it is for pushing / popping the stack frame in a functions prologue or epilogue. The ''Super Mario Galaxy'' games do not use very many different paired single instructions, so this page only covers the ones used by the game.

== Loading And Storing ==
=== psq_l ===
Loads a paired single into the destination register '''FRD'''.
<pre>
psq_l FRD, D(RA), W, I
</pre>
{| class="wikitable"
|-
! Name !! Description
|-
| FRD|| Destination register for the paired single loaded.
|-
| D(RA)|| Memory address, where '''D''' is the offset, and '''RA''' is the source register.
|-
| W || Size of the paired single. '''0''' loads the first two floats where '''1''' only loads the third.
|-
| I || Determines the type of register to load from. Only used as '''0''' (floating point).
|}

== Math ==
=== ps_madd ===
<pre>
ps_madd FRT, FRA, FRB, FRC
</pre>

<math>
\text{FRT}_{\text{high}} = (\text{FRA}_{\text{high}} \times \text{FRB}_{\text{high}}) + \text{FRC}_{\text{high}}
</math>

<math>
\text{FRT}_{\text{low}} = (\text{FRA}_{\text{low}} \times \text{FRB}_{\text{low}}) + \text{FRC}_{\text{low}}
</math>

Paired Singles - Revision history