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- .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}
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