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lib/fst: Remove unaligned pointer access

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This commit is contained in:
Martin Povišer 2025-02-03 11:13:07 +01:00
parent f5c53a99e7
commit 212d2a6d6e
3 changed files with 44 additions and 20 deletions
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42
libs/fst/00_PATCH_strict_alignment.patch Normal file
View file

@ -0,0 +1,42 @@
diff --git a/fastlz.cc b/fastlz.cc
index 3272ca7a8..41ea27a16 100644
--- a/fastlz.cc
+++ b/fastlz.cc
@@ -60,24 +60,9 @@
#endif
/*
- * Prevent accessing more than 8-bit at once, except on x86 architectures.
+ * Yosys patch: do not do unaligned accesses on any platform
*/
-#if !defined(FASTLZ_STRICT_ALIGN)
#define FASTLZ_STRICT_ALIGN
-#if defined(__i386__) || defined(__386) /* GNU C, Sun Studio */
-#undef FASTLZ_STRICT_ALIGN
-#elif defined(__i486__) || defined(__i586__) || defined(__i686__) || defined(__amd64) /* GNU C */
-#undef FASTLZ_STRICT_ALIGN
-#elif defined(_M_IX86) /* Intel, MSVC */
-#undef FASTLZ_STRICT_ALIGN
-#elif defined(__386)
-#undef FASTLZ_STRICT_ALIGN
-#elif defined(_X86_) /* MinGW */
-#undef FASTLZ_STRICT_ALIGN
-#elif defined(__I86__) /* Digital Mars */
-#undef FASTLZ_STRICT_ALIGN
-#endif
-#endif
/* prototypes */
int fastlz_compress(const void* input, int length, void* output);
@@ -88,11 +73,7 @@ int fastlz_decompress(const void* input, int length, void* output, int maxout);
#define MAX_LEN 264 /* 256 + 8 */
#define MAX_DISTANCE 8192
-#if !defined(FASTLZ_STRICT_ALIGN)
-#define FASTLZ_READU16(p) *((const flzuint16*)(p))
-#else
#define FASTLZ_READU16(p) ((p)[0] | (p)[1]<<8)
-#endif
#define HASH_LOG 13
#define HASH_SIZE (1<< HASH_LOG)

1
libs/fst/00_UPDATE.sh
View file

@ -17,3 +17,4 @@ sed -i -e 's,"fastlz.c","fastlz.cc",' *.cc *.h
patch -p0 < 00_PATCH_win_zlib.patch
patch -p0 < 00_PATCH_win_io.patch
patch -p1 < 00_PATCH_strict_alignment.patch

21
libs/fst/fastlz.cc
View file

@ -60,24 +60,9 @@
#endif
/*
* Prevent accessing more than 8-bit at once, except on x86 architectures.
* Yosys patch: do not do unaligned accesses on any platform
*/
#if !defined(FASTLZ_STRICT_ALIGN)
#define FASTLZ_STRICT_ALIGN
#if defined(__i386__) || defined(__386) /* GNU C, Sun Studio */
#undef FASTLZ_STRICT_ALIGN
#elif defined(__i486__) || defined(__i586__) || defined(__i686__) || defined(__amd64) /* GNU C */
#undef FASTLZ_STRICT_ALIGN
#elif defined(_M_IX86) /* Intel, MSVC */
#undef FASTLZ_STRICT_ALIGN
#elif defined(__386)
#undef FASTLZ_STRICT_ALIGN
#elif defined(_X86_) /* MinGW */
#undef FASTLZ_STRICT_ALIGN
#elif defined(__I86__) /* Digital Mars */
#undef FASTLZ_STRICT_ALIGN
#endif
#endif
/* prototypes */
int fastlz_compress(const void* input, int length, void* output);
@ -88,11 +73,7 @@ int fastlz_decompress(const void* input, int length, void* output, int maxout);
#define MAX_LEN 264 /* 256 + 8 */
#define MAX_DISTANCE 8192
#if !defined(FASTLZ_STRICT_ALIGN)
#define FASTLZ_READU16(p) *((const flzuint16*)(p))
#else
#define FASTLZ_READU16(p) ((p)[0] | (p)[1]<<8)
#endif
#define HASH_LOG 13
#define HASH_SIZE (1<< HASH_LOG)