android/jni/tremolo/floor1LARM.s

   1         .text
   2
   3         .global render_lineARM
   4
   5 render_lineARM:
   6         @ r0 = n
   7         @ r1 = d
   8         @ r2 = floor
   9         @ r3 = base
  10         @ <> = err
  11         @ <> = adx
  12         @ <> = ady
  13         MOV     r12,r13
  14         STMFD   r13!,{r4-r6,r11,r14}
  15         LDMFD   r12,{r11,r12,r14}       @ r11 = err
  16                                         @ r12 = adx
  17                                         @ r14 = ady
  18 rl_loop:
  19         LDR     r4, [r1]                @ r4 = *d
  20         LDR     r5, [r2], r3,LSL #2     @ r5 = *floor    r2 = floor+base
  21         SUBS    r11,r11,r14             @ err -= ady
  22         MOV     r4, r4, ASR #6
  23         MUL     r5, r4, r5              @ r5 = MULT31_SHIFT15
  24         ADDLT   r11,r11,r12             @ if (err < 0) err+=adx
  25         ADDLT   r2, r2, #4              @              floor+=1
  26         SUBS    r0, r0, #1
  27         STR     r5, [r1], #4
  28         BGT     rl_loop
  29
  30         LDMFD   r13!,{r4-r6,r11,PC}