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Fix wrong documentation of some wq/wdxx instructions #604

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Aug 31, 2024
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Fix wrong documentation of some wq/wdxx instructions #604

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10 changes: 5 additions & 5 deletions src/fuel-vm/instruction-set.md
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Original file line number Diff line number Diff line change
Expand Up @@ -930,7 +930,7 @@ Panic if:
|-------------|----------------------------------------------------------------------------------------|
| Description | Combined multiply-divide of 128-bit integers with arbitrary precision. |
| Operation | `b=mem[$rB,16];`<br>`c=mem[$rC,16];`<br>`d=mem[$rD,16];`<br>`mem[$rA,16]=(b * c) / d;` |
| Syntax | `wddv $rA, $rB, $rC, $rD` |
| Syntax | `wdmd $rA, $rB, $rC, $rD` |
| Encoding | `0x00 rA rB rC rD` |
| Notes | Division by zero is treated as division by `1 << 128` instead. |

Expand All @@ -953,7 +953,7 @@ Panic if:
|-------------|----------------------------------------------------------------------------------------|
| Description | Combined multiply-divide of 256-bit integers with arbitrary precision. |
| Operation | `b=mem[$rB,32];`<br>`c=mem[$rC,32];`<br>`d=mem[$rD,32];`<br>`mem[$rA,32]=(b * c) / d;` |
| Syntax | `wqdv $rA, $rB, $rC, $rD` |
| Syntax | `wqmd $rA, $rB, $rC, $rD` |
| Encoding | `0x00 rA rB rC rD` |
| Notes | Division by zero is treated as division by `1 << 256` instead. |

Expand Down Expand Up @@ -997,13 +997,13 @@ Panic if:
|-------------|--------------------------------------------------------------------------------------|
| Description | Add two 256-bit integers and compute modulo remainder with arbitrary precision. |
| Operation | `b=mem[$rB,32];`<br>`c=mem[$rC,32];`<br>`d=mem[$rD,32];`<br>`mem[$rA,32] = (b+c)%d;` |
| Syntax | `wdam $rA, $rB, $rC, $rD` |
| Syntax | `wqam $rA, $rB, $rC, $rD` |
| Encoding | `0x00 rA rB rC rD` |
| Notes | |

`$of` is cleared.

If the rhs operand is zero, `MEM[$rA, 16]` is cleared and `$err` is set to `true`. Otherwise, `$err` is cleared.
If the rhs operand is zero, `MEM[$rA, 32]` is cleared and `$err` is set to `true`. Otherwise, `$err` is cleared.

Panic if:

Expand Down Expand Up @@ -1045,7 +1045,7 @@ Panic if:

`$of` is cleared.

If the rhs operand is zero, `MEM[$rA, 16]` is cleared and `$err` is set to `true`. Otherwise, `$err` is cleared.
If the rhs operand is zero, `MEM[$rA, 32]` is cleared and `$err` is set to `true`. Otherwise, `$err` is cleared.

Panic if:

Expand Down
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