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Rewrite Fix to Still Auto-Vectorize

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This commit is contained in:
W. Felix Handte 2021-11-09 12:15:18 -05:00
parent 61765cacd0
commit 48572f52b1
1 changed files with 7 additions and 2 deletions
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9
lib/compress/zstd_compress.c
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@ -2332,12 +2332,17 @@ ZSTD_reduceTable_internal (U32* const table, U32 const size, U32 const reducerVa
for (rowNb=0 ; rowNb < nbRows ; rowNb++) { for (rowNb=0 ; rowNb < nbRows ; rowNb++) {
int column; int column;
for (column=0; column<ZSTD_ROWSIZE; column++) { for (column=0; column<ZSTD_ROWSIZE; column++) {
U32 newVal;
if (preserveMark && table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) { if (preserveMark && table[cellNb] == ZSTD_DUBT_UNSORTED_MARK) {
/* This write is pointless, but is required(?) for the compiler
* to auto-vectorize the loop. */
newVal = ZSTD_DUBT_UNSORTED_MARK;
} else if (table[cellNb] < reducerThreshold) { } else if (table[cellNb] < reducerThreshold) {
table[cellNb] = 0; newVal = 0;
} else { } else {
table[cellNb] -= reducerValue; newVal = table[cellNb] - reducerValue;
} }
table[cellNb] = newVal;
cellNb++; cellNb++;
} } } }
} }