fix test failure on i686 and s390

https://github.com/facebook/zstd/pull/2432

alignment.patch

@@ -0,0 +1,44 @@
+From ae85676d44baee3d12168a5c929347b3836f2cf2 Mon Sep 17 00:00:00 2001
+From: Nick Terrell <terrelln@fb.com>
+Date: Thu, 17 Dec 2020 14:27:53 -0800
+Subject: [PATCH] Fix alignment of scratchBuffer in HUF_compressWeights()
+
+The scratch buffer must be 4-byte aligned. This causes test failures in
+32-bit systems, where the stack isn't aligned.
+
+Fixes Issue #2428.
+---
+ lib/common/fse.h            | 5 +++--
+ lib/compress/huf_compress.c | 2 +-
+ 2 files changed, 4 insertions(+), 3 deletions(-)
+
+diff --git a/lib/common/fse.h b/lib/common/fse.h
+index 83a07847a..dd5fc44e8 100644
+--- a/lib/common/fse.h
++++ b/lib/common/fse.h
+@@ -335,9 +335,10 @@ size_t FSE_buildCTable_rle (FSE_CTable* ct, unsigned char symbolValue);
+ 
+ /* FSE_buildCTable_wksp() :
+  * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`).
+- * `wkspSize` must be >= `FSE_BUILD_CTABLE_WORKSPACE_SIZE(maxSymbolValue, tableLog)`.
++ * `wkspSize` must be >= `FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog)` of `unsigned`.
+  */
+-#define FSE_BUILD_CTABLE_WORKSPACE_SIZE(maxSymbolValue, tableLog) (sizeof(unsigned) * (maxSymbolValue + 2) + (1ull << tableLog))
++#define FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog) (maxSymbolValue + 2 + (1ull << (tableLog - 2)))
++#define FSE_BUILD_CTABLE_WORKSPACE_SIZE(maxSymbolValue, tableLog) (sizeof(unsigned) * FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(maxSymbolValue, tableLog))
+ size_t FSE_buildCTable_wksp(FSE_CTable* ct, const short* normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize);
+ 
+ #define FSE_BUILD_DTABLE_WKSP_SIZE(maxTableLog, maxSymbolValue) (sizeof(short) * (maxSymbolValue + 1) + (1ULL << maxTableLog) + 8)
+diff --git a/lib/compress/huf_compress.c b/lib/compress/huf_compress.c
+index abbcc3192..00c593d7e 100644
+--- a/lib/compress/huf_compress.c
++++ b/lib/compress/huf_compress.c
+@@ -69,7 +69,7 @@ static size_t HUF_compressWeights (void* dst, size_t dstSize, const void* weight
+     U32 tableLog = MAX_FSE_TABLELOG_FOR_HUFF_HEADER;
+ 
+     FSE_CTable CTable[FSE_CTABLE_SIZE_U32(MAX_FSE_TABLELOG_FOR_HUFF_HEADER, HUF_TABLELOG_MAX)];
+-    BYTE scratchBuffer[FSE_BUILD_CTABLE_WORKSPACE_SIZE(HUF_TABLELOG_MAX, MAX_FSE_TABLELOG_FOR_HUFF_HEADER)];
++    U32 scratchBuffer[FSE_BUILD_CTABLE_WORKSPACE_SIZE_U32(HUF_TABLELOG_MAX, MAX_FSE_TABLELOG_FOR_HUFF_HEADER)];
+ 
+     unsigned count[HUF_TABLELOG_MAX+1];
+     S16 norm[HUF_TABLELOG_MAX+1];

zstd.spec

@@ -21,6 +21,7 @@ URL:            https://github.com/facebook/zstd
 Source0:        https://github.com/facebook/zstd/archive/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 
 Patch1:         pzstd.1.patch
+Patch2:         alignment.patch
 
 BuildRequires:  gcc gtest-devel
 %if %{with pzstd}
@@ -57,6 +58,7 @@ find -name .gitignore -delete
 %if %{with pzstd}
 %patch1 -p1
 %endif
+%patch2 -p1
 
 %build
 export CFLAGS="$RPM_OPT_FLAGS"