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Loop can be rolled up without cost #416

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henkmuller opened this issue Dec 10, 2024 · 0 comments

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henkmuller commented Dec 10, 2024 •

edited

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lib_xud/lib_xud/src/core/included/XUD_RxData.S

Line 59 in 5c6d4fe

    
           NextRxWord:				                                        // Partially un-rolled to assist with timing

This code:

NextRxWord:	    // Partially un-rolled to assist with timing
    in         r11, res[r0]
    crc32_inc  r6, r11, r9, r4, 1
    stw        r11, r1[r4]
    in         r11, res[r0]
    ...
    bu         NextRxWord

can be rolled up (without loss of performance) to:

    in         r11, res[r0]
NextRxWord:
    crc32_inc  r6, r11, r9, r4, 1
    stw        r11, r1[r4]
    { in       r11, res[r0]; bu NextRxWord }

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