wehub-resource-sync
44 lines
645 B
ArmAsm
44 lines
645 B
ArmAsm
//
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// MNNRGBToGRAYFast.S
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// MNN
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//
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// Created by MNN on 2024/08/28.
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// Copyright © 2018, Alibaba Group Holding Limited
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//
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#ifdef __arm__
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#ifndef __aarch64__
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#include "MNNAsmGlobal.h"
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.text
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.align 5
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asm_function MNNRGBToGRAYFast
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// void MNNRGBToGRAYFast(const unsigned char* source, unsigned char* dest, size_t count);
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// Auto Load: r0: source, r1: dest, r2: count
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push {lr}
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vmov.i8 d4, #7
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vmov.i8 d5, #38
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vmov.i8 d6, #19
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L1:
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vld3.8 {d0, d1, d2}, [r0]!
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vmull.u8 q8, d2, d4 // b*7
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vmlal.u8 q8, d1, d5 // g*38
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vmlal.u8 q8, d0, d6 // r*19
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vqshrn.u16 d16, q8, #6
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vst1.8 {d16}, [r1]!
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subs r2, r2, #1
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bne L1
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End:
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pop {pc}
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#endif
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#endif
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