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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
- MOV r4, r4, ASR #6
- MUL r5, r4, r5 @ r5 = MULT31_SHIFT15
- ADDLT r11,r11,r12 @ if (err < 0) err+=adx
- ADDLT r2, r2, #4 @ floor+=1
- SUBS r0, r0, #1
- STR r5, [r1], #4
- BGT rl_loop
- LDMFD r13!,{r4-r6,r11,PC}
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