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Update F32A docs #42

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merged 3 commits into from
Mar 5, 2025
Merged

Update F32A docs #42

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47ff3df
Fixed f32a 'over' description
Mar 5, 2025
a2f1c7c
Fixed f32a 'multiply step' description
Mar 5, 2025
238abbd
Fixed f32a 'minus if' description
Mar 5, 2025
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10 changes: 5 additions & 5 deletions docs/f32a.md
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Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,7 @@ Most of the instructions drop the carry flag. Exceptions: `add`, `dup`.
- **Multiply Step**
- **Syntax:** `+*`
- **Description:** Perform a multiplication step.
- **Operation:** `T <- T + (if A[0] then S else 0); A <- A >> 1; T <- T >> 1; if T[0] then A[31] <- 1 else A[31] <- 0`
- **Operation:** `T <- T + (if A[0] then S else 0); A <- A >> 1; if T[0] then A[31] <- 1 else A[31] <- 0; T <- T >> 1`

- **Divide Step**
- **Syntax:** `+/`
Expand Down Expand Up @@ -156,8 +156,8 @@ Most of the instructions drop the carry flag. Exceptions: `add`, `dup`.

- **Over**
- **Syntax:** `over`
- **Description:** Copy the second value from the top of the data stack to the top.
- **Operation:** `dataStack.push(dataStack[1])`
- **Description:** Swap the top two values of the data stack.
- **Operation:** `T <- dataStack.pop(); S <- dataStack.pop(); dataStack.push(T); dataStack.push(S)`

### Control Flow Instructions

Expand Down Expand Up @@ -188,8 +188,8 @@ Most of the instructions drop the carry flag. Exceptions: `add`, `dup`.

- **Minus If**
- **Syntax:** `-if <label>`
- **Description:** Jump to the specified label if the top value of the data stack is negative.
- **Operation:** `if dataStack.pop() < 0 then p <- <label>`
- **Description:** Jump to the specified label if the top value of the data stack is nonnegative.
- **Operation:** `if dataStack.pop() >= 0 then p <- <label>`

- **Halt**
- **Syntax:** `halt`
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2 changes: 1 addition & 1 deletion src/Isa/F32a.hs
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Expand Up @@ -33,7 +33,7 @@ data Isa w l
Jump l
| -- | __if__ If T is nonzero, continues with the next instruction word addressed by P. If T is zero, jumps
If l
| -- | __-if__ Minus-if. If T is negative (T17 set), continues with the next instruction word addressed by P. If T is positive, jumps
| -- | __-if__ Minus-if. If T is negative (T[31] set), continues with the next instruction word addressed by P. If T is nonnegative, jumps
MinusIf l
| -- | __a!__ A-Store. Stores T into register A, popping the data stack
AStore
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