From: Yann Collet <cyan@fb.com>
Date: Fri, 1 Sep 2017 18:56:57 +0000 (-0700)
Subject: restored 32-bits decoder ability to decode long offsets (>32 MB, levels 21+)
X-Git-Tag: fuzz-corpora2~25^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a5c0c98ae5a7884694589d7a69bc99011add94d;p=thirdparty%2Fzstd.git

restored 32-bits decoder ability to decode long offsets (>32 MB, levels 21+)
---

diff --git a/lib/decompress/zstd_decompress.c b/lib/decompress/zstd_decompress.c
index bc8f93851..ada773b9a 100644
--- a/lib/decompress/zstd_decompress.c
+++ b/lib/decompress/zstd_decompress.c
@@ -1365,12 +1365,8 @@ static size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
         ip += litCSize;
         srcSize -= litCSize;
     }
-    if (sizeof(size_t) > 4)  /* do not enable prefetching on 32-bits x86, as it's performance detrimental */
-                             /* likely because of register pressure */
-                             /* if that's the correct cause, then 32-bits ARM should be affected differently */
-                             /* it would be good to test this on ARM real hardware, to see if prefetch version improves speed */
-        if (dctx->fParams.windowSize > (1<<23))
-            return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize);
+    if (dctx->fParams.windowSize > (1<<23))
+        return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize);
     return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize);
 }