From: Yann Collet <Cyan4973@users.noreply.github.com>
Date: Mon, 20 Dec 2021 19:43:14 +0000 (-0800)
Subject: Revert "Limit `ZSTD_maxCLevel` to 21 for 32-bit binaries."
X-Git-Tag: v1.5.1~1^2~1^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2940%2Fhead;p=thirdparty%2Fzstd.git

Revert "Limit `ZSTD_maxCLevel` to 21 for 32-bit binaries."
---

diff --git a/.github/workflows/dev-short-tests.yml b/.github/workflows/dev-short-tests.yml
index b5cd2415d..f06dfdb61 100644
--- a/.github/workflows/dev-short-tests.yml
+++ b/.github/workflows/dev-short-tests.yml
@@ -30,8 +30,6 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: make check on 32-bit
-      env:
-        CHECK_CONSTRAINED_MEM: true
       run: |
         sudo apt update
         APT_PACKAGES="gcc-multilib" make apt-install
diff --git a/doc/zstd_manual.html b/doc/zstd_manual.html
index 7d2e1c6ca..3d62f5952 100644
--- a/doc/zstd_manual.html
+++ b/doc/zstd_manual.html
@@ -40,7 +40,7 @@
   functions.
 
   The library supports regular compression levels from 1 up to ZSTD_maxCLevel(),
-  which is 22 in most cases. Levels >= 20, labeled `--ultra`, should be used with
+  which is currently 22. Levels >= 20, labeled `--ultra`, should be used with
   caution, as they require more memory. The library also offers negative
   compression levels, which extend the range of speed vs. ratio preferences.
   The lower the level, the faster the speed (at the cost of compression).
diff --git a/lib/compress/clevels.h b/lib/compress/clevels.h
index c2ceb6384..7ed2e0049 100644
--- a/lib/compress/clevels.h
+++ b/lib/compress/clevels.h
@@ -16,8 +16,7 @@
 
 /*-=====  Pre-defined compression levels  =====-*/
 
-#define ZSTD_MAX_CLEVEL           22
-#define ZSTD_MAX_32BIT_CLEVEL     21
+#define ZSTD_MAX_CLEVEL     22
 
 #ifdef __GNUC__
 __attribute__((__unused__))
diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index e3d40c540..34f8e970f 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -6165,7 +6165,7 @@ size_t ZSTD_endStream(ZSTD_CStream* zcs, ZSTD_outBuffer* output)
 /*-=====  Pre-defined compression levels  =====-*/
 #include "clevels.h"
 
-int ZSTD_maxCLevel(void) { return MEM_32bits() ? ZSTD_MAX_32BIT_CLEVEL : ZSTD_MAX_CLEVEL; }
+int ZSTD_maxCLevel(void) { return ZSTD_MAX_CLEVEL; }
 int ZSTD_minCLevel(void) { return (int)-ZSTD_TARGETLENGTH_MAX; }
 int ZSTD_defaultCLevel(void) { return ZSTD_CLEVEL_DEFAULT; }
 
@@ -6261,7 +6261,7 @@ static ZSTD_compressionParameters ZSTD_getCParams_internal(int compressionLevel,
     /* row */
     if (compressionLevel == 0) row = ZSTD_CLEVEL_DEFAULT;   /* 0 == default */
     else if (compressionLevel < 0) row = 0;   /* entry 0 is baseline for fast mode */
-    else if (compressionLevel > ZSTD_maxCLevel()) row = ZSTD_maxCLevel();
+    else if (compressionLevel > ZSTD_MAX_CLEVEL) row = ZSTD_MAX_CLEVEL;
     else row = compressionLevel;
 
     {   ZSTD_compressionParameters cp = ZSTD_defaultCParameters[tableID][row];
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index c35be8e26..d168d6576 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -1982,7 +1982,7 @@ static int basicUnitTests(U32 const seed, double compressibility)
             int const rowLevelEnd = 8;
 
             DISPLAYLEVEL(3, "test%3i : flat-dictionary efficiency test : \n", testNb++);
-            assert(maxLevel == (MEM_32bits() ? 21 : 22));
+            assert(maxLevel == 22);
             RDG_genBuffer(CNBuffer, flatdictSize + contentSize, compressibility, 0., seed);
             DISPLAYLEVEL(4, "content hash : %016llx;  dict hash : %016llx \n",
                         (unsigned long long)XXH64(contentStart, contentSize, 0),
diff --git a/tests/playTests.sh b/tests/playTests.sh
index 11240898e..a772b61ff 100755
--- a/tests/playTests.sh
+++ b/tests/playTests.sh
@@ -1568,11 +1568,6 @@ elif [ "$longCSize19wlog23" -gt "$optCSize19wlog23" ]; then
     exit 1
 fi
 
-if [ -n "$CHECK_CONSTRAINED_MEM" ]; then
-    println "\n===>  zsdt constrained memory tests "
-    # shellcheck disable=SC2039
-    (ulimit -Sv 500000 ; datagen -g2M | zstd -22 --single-thread --ultra > /dev/null)
-fi
 
 if [ "$1" != "--test-large-data" ]; then
     println "Skipping large data tests"