diff options
Diffstat (limited to 'Tremolo/floor1ARM.s')
| -rw-r--r-- | Tremolo/floor1ARM.s | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/Tremolo/floor1ARM.s b/Tremolo/floor1ARM.s new file mode 100644 index 0000000..8ec201e --- /dev/null +++ b/Tremolo/floor1ARM.s @@ -0,0 +1,36 @@ +@ Tremolo library +@ Copyright (C) 2009 Robin Watts for Pinknoise Productions Ltd + + .text + + .global render_lineARM + +render_lineARM: + @ r0 = n + @ r1 = d + @ r2 = floor + @ r3 = base + @ <> = err + @ <> = adx + @ <> = ady + MOV r12,r13 + STMFD r13!,{r4-r6,r11,r14} + LDMFD r12,{r11,r12,r14} @ r11 = err + @ r12 = adx + @ r14 = ady +rl_loop: + LDR r4,[r1] @ r4 = *d + LDR r5,[r2],r3,LSL #2 @ r5 = *floor r2 = floor+base + SUBS r11,r11,r14 @ err -= ady + ADDLT r11,r11,r12 @ if (err < 0) err+=adx + SMULL r6, r5, r4, r5 @ (r6,r5) = *d * *floor + ADDLT r2, r2, #4 @ floor+=1 + MOVS r6, r6, LSR #15 + ADC r5, r6, r5, LSL #17 @ r5 = MULT31_SHIFT15 + STR r5,[r1],#4 + SUBS r0, r0, #1 + BGT rl_loop + + LDMFD r13!,{r4-r6,r11,PC} + + @ END |