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Prevent false warnings in memcpy (GCC 12)
GCC 12 tree-loop-distribute-patterns generates false warnings of -Warray-bounds, -Wstringop-overflow, or -Wstringop-overread in memcpy() and memcpy_cpu() in static/inline cases for code that obviously prevents its execution by invariant checking. On -O3, even more warnings are produced.
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@ -25,7 +25,10 @@ namespace Genode {
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* \param size number of bytes to copy
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*
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* \return number of bytes not copied
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*
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* The compiler attribute prevents array-bounds warnings with gcc 12.3.
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*/
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__attribute((optimize("no-tree-loop-distribute-patterns")))
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inline size_t memcpy_cpu(void * dst, const void * src, size_t size)
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{
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using word_t = unsigned long;
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@ -130,7 +130,7 @@ namespace Genode {
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/**
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* Return length of null-terminated string in bytes
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*/
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__attribute((optimize("no-tree-loop-distribute-patterns")))
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__attribute((optimize("no-tree-loop-distribute-patterns")))
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inline size_t strlen(const char *s)
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{
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size_t res = 0;
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@ -190,6 +190,9 @@ namespace Genode {
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*/
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inline void *memcpy(void *dst, const void *src, size_t size)
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{
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if (!size)
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return dst;
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char *d = (char *)dst, *s = (char *)src;
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size_t i;
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@ -281,7 +284,7 @@ namespace Genode {
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* generation of a 'memset()' call in the 'while' loop
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* with gcc 10.
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*/
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__attribute((optimize("no-tree-loop-distribute-patterns")))
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__attribute((optimize("no-tree-loop-distribute-patterns")))
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inline void *memset(void *dst, uint8_t i, size_t size)
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{
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using word_t = unsigned long;
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