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| author | Denis Vlasenko | 2007-10-14 01:37:53 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2007-10-14 01:37:53 +0000 |
| commit | 9435993b01d789ebb984457ca2ba0eec627470db (patch) | |
| tree | 9c9d11f6ebdc745525244bffcbd469fda018e0b4 /archival | |
| parent | be5a7b965587307d8a7da7f8e35cb2470bf00dc4 (diff) | |
| download | busybox-9435993b01d789ebb984457ca2ba0eec627470db.zip busybox-9435993b01d789ebb984457ca2ba0eec627470db.tar.gz | |
bzip2: code size shrink
Diffstat (limited to 'archival')
| -rw-r--r-- | archival/bz/huffman.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/archival/bz/huffman.c b/archival/bz/huffman.c index 89e5460..f016c96 100644 --- a/archival/bz/huffman.c +++ b/archival/bz/huffman.c @@ -46,10 +46,16 @@ in the file LICENSE. heap[zz] = tmp; \ } -#define DOWNHEAP(z) \ + +/* 90 bytes, 0.3% of overall compress speed */ +#if CONFIG_BZIP2_FEATURE_SPEED >= 1 + +/* macro works better than inline (gcc 4.2.1) */ +#define DOWNHEAP1(heap, weight, Heap) \ { \ int32_t zz, yy, tmp; \ - zz = z; tmp = heap[zz]; \ + zz = 1; \ + tmp = heap[zz]; \ while (1) { \ yy = zz << 1; \ if (yy > nHeap) \ @@ -65,6 +71,30 @@ in the file LICENSE. heap[zz] = tmp; \ } +#else + +static +void DOWNHEAP1(int32_t *heap, int32_t *weight, int32_t nHeap) +{ + int32_t zz, yy, tmp; + zz = 1; + tmp = heap[zz]; + while (1) { + yy = zz << 1; + if (yy > nHeap) + break; + if (yy < nHeap + && weight[heap[yy + 1]] < weight[heap[yy]]) + yy++; + if (weight[tmp] < weight[heap[yy]]) + break; + heap[zz] = heap[yy]; + zz = yy; + } + heap[zz] = tmp; +} + +#endif /*---------------------------------------------------*/ static @@ -105,8 +135,8 @@ void BZ2_hbMakeCodeLengths(uint8_t *len, AssertH(nHeap < (BZ_MAX_ALPHA_SIZE+2), 2001); while (nHeap > 1) { - n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1); - n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP(1); + n1 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP1(heap, weight, nHeap); + n2 = heap[1]; heap[1] = heap[nHeap]; nHeap--; DOWNHEAP1(heap, weight, nHeap); nNodes++; parent[n1] = parent[n2] = nNodes; weight[nNodes] = ADDWEIGHTS(weight[n1], weight[n2]); |