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| author | Miquel Sabaté Solà <mssola@mssola.com> | 2026-03-06 16:12:12 +0100 |
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| committer | Miquel Sabaté Solà <mssola@mssola.com> | 2026-03-06 16:12:12 +0100 |
| commit | 695d225256ed129ce55eb2dfde9de33d3d5f3af9 (patch) | |
| tree | f340ab777c3ccd6b7a2dba2a24c0929c751006d3 /src | |
| parent | f1133047080fed08d7829a5115bd8c9e42cc1dfc (diff) | |
| download | jetpac.nes-695d225256ed129ce55eb2dfde9de33d3d5f3af9.tar.gz jetpac.nes-695d225256ed129ce55eb2dfde9de33d3d5f3af9.zip | |
Small savings on re-using untouched registers
Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/enemies.s | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/src/enemies.s b/src/enemies.s index 2c43d77..64e4b23 100644 --- a/src/enemies.s +++ b/src/enemies.s @@ -158,8 +158,7 @@ ;; Initialize the enemy arg, which is always 1 except for homing ;; attacks. ldy #1 - txa - cmp #3 + cpx #3 bne @set_enemy_arg iny @set_enemy_arg: @@ -435,11 +434,6 @@ ;; NOTE: this function assumes that the enemy is in a valid state. That's up ;; to the caller to check before calling this function. .proc allocate_x_y - ;; Save the 'y' index, as it's faster to do funny address arithmetics - ;; and add 16 in the end than constantly 'iny' every time in the right - ;; order. - sty Globals::zp_tmp0 - ;; Y coordinates for each sprite of the enemy. lda Enemies::zp_enemies_pool_base + 1, x sta OAM::m_sprites, y ; top left @@ -521,7 +515,7 @@ sta OAM::m_sprites + 15, y ; bottom right ;; And update the 'y' register to notify 16 bytes were stored. - lda Globals::zp_tmp0 + tya clc adc #16 tay |