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| author | Eldred Habert <eldredhabert0@gmail.com> | 2019-02-18 20:53:31 +0100 |
|---|---|---|
| committer | Eldred Habert <eldredhabert0@gmail.com> | 2019-02-18 20:53:31 +0100 |
| commit | b8e1245b7a56779276a669024eb3c5d21c11e583 (patch) | |
| tree | c374b50736b1b5f490e9943d58caa667e8d93fe2 /Optimizing-assembly-code.md | |
| parent | 6636c4b8f3a867e5b3cb4e496148c82a2053605a (diff) | |
Reorder two sections to group those related to `[hl]`
Diffstat (limited to 'Optimizing-assembly-code.md')
| -rw-r--r-- | Optimizing-assembly-code.md | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/Optimizing-assembly-code.md b/Optimizing-assembly-code.md index d5f60c5..f45a44a 100644 --- a/Optimizing-assembly-code.md +++ b/Optimizing-assembly-code.md @@ -14,8 +14,8 @@ Most of these tricks come from either [Jeff's GB Assembly Code Tips v1.0](http:/ - [Increment a 16-bit register](#increment-decrement-a-16-bit-register) - [Load from an address to `hl`](#load-from-an-address-to-hl) - [Exchange two 16-bit registers](#exchange-two-16-bit-registers) - - [Load a constant into `[hl]`](#load-a-constant-into-hl) - [Load two constants into a register pair](#load-two-constants-into-a-register-pair) + - [Load a constant into `[hl]`](#load-a-constant-into-hl) - [Load a constant into `[hl]` and increment or decrement `hl`](#load-a-constant-into-hl-and-increment-or-decrement-hl) - [Increment or decrement `[hl]`](#increment-or-decrement-hl) - [Branching (control flow)](#branching-control-flow) @@ -238,24 +238,6 @@ If you care about size: ``` -### Load a constant into `[hl]` - -Don't do: - -```asm - ; 3 bytes, 4 cycles - ld a, CONST - ld [hl], a -``` - -But do: - -```asm - ; 2 bytes, 3 cycles - ld [hl], CONST -``` - - ### Load two constants into a register pair (The example uses `bc`, but `hl` or `de` would also work.) @@ -283,6 +265,24 @@ Or better, use the `lb` macro in [macros/code.asm](../blob/master/macros/code.as ``` +### Load a constant into `[hl]` + +Don't do: + +```asm + ; 3 bytes, 4 cycles + ld a, CONST + ld [hl], a +``` + +But do: + +```asm + ; 2 bytes, 3 cycles + ld [hl], CONST +``` + + ### Load a constant into `[hl]` and incrementing or decrementing `hl` Don't do: |