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https://github.com/smallmain/cocos-enhance-kit.git
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32 lines
645 B
ArmAsm
32 lines
645 B
ArmAsm
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.text
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.global render_lineARM
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render_lineARM:
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@ r0 = n
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@ r1 = d
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@ r2 = floor
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@ r3 = base
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@ <> = err
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@ <> = adx
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@ <> = ady
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MOV r12,r13
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STMFD r13!,{r4-r6,r11,r14}
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LDMFD r12,{r11,r12,r14} @ r11 = err
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@ r12 = adx
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@ r14 = ady
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rl_loop:
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LDR r4,[r1] @ r4 = *d
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LDR r5,[r2],r3,LSL #2 @ r5 = *floor r2 = floor+base
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SUBS r11,r11,r14 @ err -= ady
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ADDLT r11,r11,r12 @ if (err < 0) err+=adx
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SMULL r6, r5, r4, r5 @ (r6,r5) = *d * *floor
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ADDLT r2, r2, #4 @ floor+=1
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MOVS r6, r6, LSR #15
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ADC r5, r6, r5, LSL #17 @ r5 = MULT31_SHIFT15
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STR r5,[r1],#4
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SUBS r0, r0, #1
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BGT rl_loop
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LDMFD r13!,{r4-r6,r11,PC}
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