From: inikep <inikep@gmail.com>
Date: Thu, 7 Apr 2016 14:58:04 +0000 (+0200)
Subject: removed void ZSTD_compressBlock_greedy
X-Git-Tag: v0.6.1^2~39^2~33
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9296400a692d9831109573edcfb9cad4dd7e6249;p=thirdparty%2Fzstd.git

removed void ZSTD_compressBlock_greedy
---

diff --git a/lib/zstd_compress.c b/lib/zstd_compress.c
index d353c3936..7d28cc214 100644
--- a/lib/zstd_compress.c
+++ b/lib/zstd_compress.c
@@ -1689,195 +1689,6 @@ static size_t ZSTD_BtFindBestMatch_selectMLS_extDict (
 }
 
 
-
-/* *******************************
-*  Greedy parser
-*********************************/
-FORCE_INLINE
-void ZSTD_compressBlock_greedy_generic(ZSTD_CCtx* ctx,
-                                     const void* src, size_t srcSize)
-{
-    seqStore_t* seqStorePtr = &(ctx->seqStore);
-    const BYTE* const istart = (const BYTE*)src;
-    const BYTE* ip = istart;
-    const BYTE* anchor = istart;
-    const BYTE* const iend = istart + srcSize;
-    const BYTE* const ilimit = iend - 8;
-    const BYTE* const base = ctx->base + ctx->dictLimit;
-
-    const U32 maxSearches = 1 << ctx->params.cParams.searchLog;
-    const U32 mls = ctx->params.cParams.searchLength;
-
-    /* init */
-    U32 rep[ZSTD_REP_INIT];
-    for (U32 i=0; i<ZSTD_REP_INIT; i++)
-        rep[i]=REPCODE_STARTVALUE;
-
-    ZSTD_resetSeqStore(seqStorePtr);
-    if ((ip-base) < REPCODE_STARTVALUE) ip = base + REPCODE_STARTVALUE;
-
-    /* Match Loop */
-    while (ip < ilimit) {
-        size_t matchLength=0;
-        size_t offset=0;
-        const BYTE* start=ip+1;
-
-        /* check repCode */
-        if (MEM_read32(start) == MEM_read32(start - rep[0])) {
-            /* repcode : we take it */
-            matchLength = ZSTD_count(start+EQUAL_READ32, start+EQUAL_READ32-rep[0], iend) + EQUAL_READ32;
-            goto _storeSequence;
-        }
-
-        /* first search (depth 0) */
-        {   size_t offsetFound = 99999999;
-            size_t const ml2 = ZSTD_HcFindBestMatch_selectMLS(ctx, ip, iend, &offsetFound, maxSearches, mls);
-            if (ml2 > matchLength)
-                matchLength = ml2, start = ip, offset=offsetFound;
-        }
-
-        if (matchLength < EQUAL_READ32) {
-            ip += ((ip-anchor) >> g_searchStrength) + 1;   /* jump faster over incompressible sections */
-            continue;
-        }
-
-        /* catch up */
-        while ((start>anchor) && (start>base+offset-ZSTD_REP_MOVE) && (start[-1] == start[-1-offset+ZSTD_REP_MOVE]))   /* only search for offset within prefix */
-            { start--; matchLength++; }
-        rep[1] = rep[0]; rep[0] = (U32)(offset - ZSTD_REP_MOVE);
-
-_storeSequence:
-        /* store sequence */
-        {   size_t const litLength = start - anchor;
-            ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, matchLength-MINMATCH);
-            anchor = ip = start + matchLength;
-        }
-        
-        /* check immediate repcode */
-        while ( (ip <= ilimit)
-             && (MEM_read32(ip) == MEM_read32(ip - rep[1])) ) {
-            /* store sequence */
-            matchLength = ZSTD_count(ip+EQUAL_READ32, ip+EQUAL_READ32-rep[1], iend) + EQUAL_READ32;
-            offset = rep[1]; rep[1] = rep[0]; rep[0] = (U32)offset;  /* swap offset history */
-            ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH);
-            ip += matchLength;
-            anchor = ip;
-            continue;   /* faster when present ... (?) */
-    }    }
-
-    /* Last Literals */
-    {   size_t const lastLLSize = iend - anchor;
-        memcpy(seqStorePtr->lit, anchor, lastLLSize);
-        seqStorePtr->lit += lastLLSize;
-        ZSTD_statsUpdatePrices(&seqStorePtr->stats, lastLLSize, anchor, 0, 0);
-    }
-}
-
-
-FORCE_INLINE
-void ZSTD_compressBlock_greedy_extDict_generic(ZSTD_CCtx* ctx,
-                                     const void* src, size_t srcSize)
-{
-    seqStore_t* seqStorePtr = &(ctx->seqStore);
-    const BYTE* const istart = (const BYTE*)src;
-    const BYTE* ip = istart;
-    const BYTE* anchor = istart;
-    const BYTE* const iend = istart + srcSize;
-    const BYTE* const ilimit = iend - 8;
-    const BYTE* const base = ctx->base;
-    const U32 dictLimit = ctx->dictLimit;
-    const BYTE* const prefixStart = base + dictLimit;
-    const BYTE* const dictBase = ctx->dictBase;
-    const BYTE* const dictEnd  = dictBase + dictLimit;
-    const BYTE* const dictStart  = dictBase + ctx->lowLimit;
-
-    const U32 maxSearches = 1 << ctx->params.cParams.searchLog;
-    const U32 mls = ctx->params.cParams.searchLength;
-
-    /* init */
-    U32 rep[ZSTD_REP_INIT];
-    for (U32 i=0; i<ZSTD_REP_INIT; i++)
-        rep[i]=REPCODE_STARTVALUE;
-
-    ZSTD_resetSeqStore(seqStorePtr);
-    if ((ip - prefixStart) < REPCODE_STARTVALUE) ip += REPCODE_STARTVALUE;
-
-    /* Match Loop */
-    while (ip < ilimit) {
-        size_t matchLength=0;
-        size_t offset=0;
-        const BYTE* start=ip+1;
-        U32 current = (U32)(start-base);
-
-        /* check repCode */
-        {
-            const U32 repIndex = (U32)(current - rep[0]);
-            const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
-            const BYTE* const repMatch = repBase + repIndex;
-            if ((U32)((dictLimit-1) - repIndex) >= 3)   /* intentional overflow */
-            if (MEM_read32(start) == MEM_read32(repMatch)) {
-                /* repcode detected we should take it */
-                const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
-                matchLength = ZSTD_count_2segments(start+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
-                goto _storeSequence;
-        }   }
-
-        /* first search (depth 0) */
-        {   size_t offsetFound = 99999999;
-            size_t const ml2 = ZSTD_HcFindBestMatch_extDict_selectMLS(ctx, ip, iend, &offsetFound, maxSearches, mls);
-            if (ml2 > matchLength)
-                matchLength = ml2, start = ip, offset=offsetFound;
-        }
-
-         if (matchLength < EQUAL_READ32) {
-            ip += ((ip-anchor) >> g_searchStrength) + 1;   /* jump faster over incompressible sections */
-            continue;
-        }
-
-        /* catch up */
-        if (offset >= ZSTD_REP_NUM) {
-            U32 matchIndex = (U32)((start-base) - (offset - ZSTD_REP_MOVE));
-            const BYTE* match = (matchIndex < dictLimit) ? dictBase + matchIndex : base + matchIndex;
-            const BYTE* const mStart = (matchIndex < dictLimit) ? dictStart : prefixStart;
-            while ((start>anchor) && (match>mStart) && (start[-1] == match[-1])) { start--; match--; matchLength++; }
-            rep[1] = rep[0]; rep[0] = (U32)(offset - ZSTD_REP_MOVE);
-        } 
-
-_storeSequence:
-        /* store sequence */
-        {   size_t const litLength = start - anchor;
-            ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, matchLength-MINMATCH);
-            anchor = ip = start + matchLength;
-        }
-
-        /* check immediate repcode */
-        while (ip <= ilimit) {
-            const U32 repIndex = (U32)((ip-base) - rep[1]);
-            const BYTE* const repBase = repIndex < dictLimit ? dictBase : base;
-            const BYTE* const repMatch = repBase + repIndex;
-            if ((U32)((dictLimit-1) - repIndex) >= 3)   /* intentional overflow */
-            if (MEM_read32(ip) == MEM_read32(repMatch)) {
-                /* repcode detected we should take it */
-                const BYTE* const repEnd = repIndex < dictLimit ? dictEnd : iend;
-                matchLength = ZSTD_count_2segments(ip+EQUAL_READ32, repMatch+EQUAL_READ32, iend, repEnd, prefixStart) + EQUAL_READ32;
-                offset = rep[1]; rep[1] = rep[0]; rep[0] = (U32)offset;   /* swap offset history */
-                ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH);
-                ip += matchLength;
-                anchor = ip;
-                continue;   /* faster when present ... (?) */
-            }
-            break;
-    }   }
-
-    /* Last Literals */
-    {   size_t const lastLLSize = iend - anchor;
-        memcpy(seqStorePtr->lit, anchor, lastLLSize);
-        seqStorePtr->lit += lastLLSize;
-    }
-}
-
-
-
 /* *******************************
 *  Common parser - lazy strategy
 *********************************/
@@ -1916,22 +1727,13 @@ void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
     while (ip < ilimit) {
         size_t matchLength=0;
         size_t offset=0;
-        const BYTE* start=ip;
+        const BYTE* start=ip+1;
 
         /* check repCode */
-        for (U32 i=0; i<ZSTD_REP_NUM; i++)
-        if (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[i], minMatch)) {
+        if (MEM_readMINMATCH(ip+1, minMatch) == MEM_readMINMATCH(ip+1 - rep[0], minMatch)) {
             /* repcode : we take it */
-            if (matchLength==0) {
-                matchLength = ZSTD_count(ip+minMatch, ip+minMatch-rep[i], iend) + minMatch;
-                offset = i;
-            } else {
-                size_t mlRep = ZSTD_count(ip+minMatch, ip+minMatch-rep[i], iend) + minMatch;
-                int gain2 = (int)(mlRep * 3 /*- ZSTD_highbit((U32)i+1)*/ + (i==1));
-                int gain1 = (int)(matchLength*3 - /*ZSTD_highbit((U32)offset+1)*/ + 1 + (offset==1));
-                if (gain2 > gain1)
-                    matchLength = mlRep, offset = i;
-            }
+            matchLength = ZSTD_count(ip+1+minMatch, ip+1+minMatch-rep[0], iend) + minMatch;
+            if (depth==0) goto _storeSequence;
         }
 
         /* first search (depth 0) */
@@ -1950,13 +1752,12 @@ void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
         if (depth>=1)
         while (ip<ilimit) {
             ip ++;
-            for (U32 i=0; i<ZSTD_REP_NUM; i++)
-            if (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[i], minMatch)) {
-                size_t const mlRep = ZSTD_count(ip+minMatch, ip+minMatch-rep[i], iend) + minMatch;
+            if ((offset) && (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[0], minMatch))) {
+                size_t const mlRep = ZSTD_count(ip+minMatch, ip+minMatch-rep[0], iend) + minMatch;
                 int const gain2 = (int)(mlRep * 3);
-                int const gain1 = (int)(matchLength*3 - ZSTD_highbit((U32)offset+1) + 1 + (offset<ZSTD_REP_NUM));
+                int const gain1 = (int)(matchLength*3 - ZSTD_highbit((U32)offset+1) + 1);
                 if ((mlRep >= MINMATCH) && (gain2 > gain1))
-                    matchLength = mlRep, offset = i, start = ip;
+                    matchLength = mlRep, offset = 0, start = ip;
             }
             {   size_t offset2=99999999;
                 size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
@@ -1970,13 +1771,12 @@ void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
             /* let's find an even better one */
             if ((depth==2) && (ip<ilimit)) {
                 ip ++;
-                for (U32 i=0; i<ZSTD_REP_NUM; i++)
-                if (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[i], minMatch)) {
-                    size_t const ml2 = ZSTD_count(ip+minMatch, ip+minMatch-rep[i], iend) + minMatch;
+                if ((offset) && (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[0], minMatch))) {
+                    size_t const ml2 = ZSTD_count(ip+minMatch, ip+minMatch-rep[0], iend) + minMatch;
                     int const gain2 = (int)(ml2 * 4);
-                    int const gain1 = (int)(matchLength*4 - ZSTD_highbit((U32)offset+1) + 1 + (offset<ZSTD_REP_NUM));
+                    int const gain1 = (int)(matchLength*4 - ZSTD_highbit((U32)offset+1) + 1);
                     if ((ml2 >= MINMATCH) && (gain2 > gain1))
-                        matchLength = ml2, offset = i, start = ip;
+                        matchLength = ml2, offset = 0, start = ip;
                 }
                 {   size_t offset2=99999999;
                     size_t const ml2 = searchMax(ctx, ip, iend, &offset2, maxSearches, mls);
@@ -1990,34 +1790,30 @@ void ZSTD_compressBlock_lazy_generic(ZSTD_CCtx* ctx,
         }
 
         /* catch up */
-        if (offset >= ZSTD_REP_NUM) {
+        if (offset) {
             while ((start>anchor) && (start>base+offset-ZSTD_REP_MOVE) && (start[-1] == start[-1-offset+ZSTD_REP_MOVE]))   /* only search for offset within prefix */
                 { start--; matchLength++; }
+            rep[1] = rep[0]; rep[0] = (U32)(offset - ZSTD_REP_MOVE);
         }
 
         /* store sequence */
-        {
-            if (offset >= ZSTD_REP_NUM) {
-                rep[2] = rep[1];
-                rep[1] = rep[0];
-                rep[0] = (U32)(offset - ZSTD_REP_MOVE);
-            } else {
-                if (offset != 0) {
-                    U32 temp = rep[offset];
-                    if (offset > 1) rep[2] = rep[1];
-                    if (offset > 0) rep[1] = rep[0];
-                    rep[0] = temp;
-                }
-
-                if (offset<=1 && start==anchor) offset = 1-offset;
-            }
-
-            size_t const litLength = start - anchor;
-
+_storeSequence:
+        {   size_t const litLength = start - anchor;
             ZSTD_storeSeq(seqStorePtr, litLength, anchor, offset, matchLength-MINMATCH);
             anchor = ip = start + matchLength;
         }
-    }
+
+        /* check immediate repcode */
+        while ( (ip <= ilimit)
+             && (MEM_readMINMATCH(ip, minMatch) == MEM_readMINMATCH(ip - rep[1], minMatch)) ) {
+            /* store sequence */
+            matchLength = ZSTD_count(ip+minMatch, ip+minMatch-rep[1], iend) + minMatch;
+            offset = rep[1]; rep[1] = rep[0]; rep[0] = offset; /* swap repcodes */
+            ZSTD_storeSeq(seqStorePtr, 0, anchor, 0, matchLength-MINMATCH);
+            ip += matchLength;
+            anchor = ip;
+            continue;   /* faster when present ... (?) */
+    }   }
 
     /* Last Literals */
     {   size_t const lastLLSize = iend - anchor;
@@ -2054,7 +1850,7 @@ static void ZSTD_compressBlock_lazy(ZSTD_CCtx* ctx, const void* src, size_t srcS
 
 static void ZSTD_compressBlock_greedy(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
 {
-    ZSTD_compressBlock_greedy_generic(ctx, src, srcSize);
+    ZSTD_compressBlock_lazy_generic(ctx, src, srcSize, 0, 0);
 }
 
 
@@ -2234,9 +2030,10 @@ void ZSTD_compressBlock_lazy_extDict_generic(ZSTD_CCtx* ctx,
     }
 }
 
+
 void ZSTD_compressBlock_greedy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)
 {
-    ZSTD_compressBlock_greedy_extDict_generic(ctx, src, srcSize);
+    ZSTD_compressBlock_lazy_extDict_generic(ctx, src, srcSize, 0, 0);
 }
 
 static void ZSTD_compressBlock_lazy_extDict(ZSTD_CCtx* ctx, const void* src, size_t srcSize)