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gnu.cfg: __builtin_bitreverse #8882

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73 changes: 72 additions & 1 deletion cfg/gnu.cfg
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@
<alloc init="false" buffer-size="malloc">pvalloc</alloc>
<dealloc>free</dealloc>
</memory>
<!-- https://gcc.gnu.org/onlinedocs/gcc/Byte-Swapping-Builtins.html -->
<function name="bswap_16">
<noreturn>false</noreturn>
<use-retval/>
Expand Down Expand Up @@ -64,10 +65,80 @@
<not-bool/>
</arg>
</function>
<define name="__builtin_bit_cast(type,value)" value="std::bit_cast&lt;type&gt;(value)"/>
<define name="__bswap_constant_64(x)" value="bswap_64(x)"/>
<define name="__builtin_bswap64(x)" value="bswap_64(x)"/>
<define name="__bswap_64(x)" value="bswap_64(x)"/>
<function name="__builtin_bitreverse8">
<noreturn>false</noreturn>
<use-retval/>
<returnValue type="uint8_t">(arg1 = ((arg1 &amp; 0x55555555) &lt;&lt; 1) | ((arg1 &amp; 0xAAAAAAAA) &gt;&gt; 1),
arg1 = ((arg1 &amp; 0x33333333) &lt;&lt; 2) | ((arg1 &amp; 0xCCCCCCCC) &gt;&gt; 2),
arg1 = ((arg1 &amp; 0x0F0F0F0F) &lt;&lt; 4) | ((arg1 &amp; 0xF0F0F0F0) &gt;&gt; 4),
arg1)
</returnValue>
<leak-ignore/>
<const/>
<arg nr="1" direction="in">
<not-uninit/>
<not-bool/>
<valid>0:</valid>
</arg>
</function>
<function name="__builtin_bitreverse16">
<noreturn>false</noreturn>
<use-retval/>
<returnValue type="uint16_t">(arg1 = ((arg1 &amp; 0x55555555u) &lt;&lt; 1) | ((arg1 &amp; 0xAAAAAAAAu) &gt;&gt; 1),
arg1 = ((arg1 &amp; 0x33333333u) &lt;&lt; 2) | ((arg1 &amp; 0xCCCCCCCCu) &gt;&gt; 2),
arg1 = ((arg1 &amp; 0x0F0F0F0Fu) &lt;&lt; 4) | ((arg1 &amp; 0xF0F0F0F0u) &gt;&gt; 4),
arg1 = ((arg1 &amp; 0x00FF00FFu) &lt;&lt; 8) | ((arg1 &amp; 0xFF00FF00u) &gt;&gt; 8),
arg1)
</returnValue>
<leak-ignore/>
<const/>
<arg nr="1" direction="in">
<not-uninit/>
<not-bool/>
<valid>0:</valid>
</arg>
</function>
<function name="__builtin_bitreverse32">
<noreturn>false</noreturn>
<use-retval/>
<returnValue type="uint32_t">(arg1 = ((arg1 &amp; 0x55555555ul) &lt;&lt; 1) | ((arg1 &amp; 0xAAAAAAAAul) &gt;&gt; 1),
arg1 = ((arg1 &amp; 0x33333333ul) &lt;&lt; 2) | ((arg1 &amp; 0xCCCCCCCCul) &gt;&gt; 2),
arg1 = ((arg1 &amp; 0x0F0F0F0Ful) &lt;&lt; 4) | ((arg1 &amp; 0xF0F0F0F0ul) &gt;&gt; 4),
arg1 = ((arg1 &amp; 0x00FF00FFul) &lt;&lt; 8) | ((arg1 &amp; 0xFF00FF00ul) &gt;&gt; 8),
arg1 = ((arg1 &amp; 0x0000FFFFul) &lt;&lt; 16) | ((arg1 &amp; 0xFFFF0000ul) &gt;&gt; 16),
arg1)
</returnValue>
<leak-ignore/>
<const/>
<arg nr="1" direction="in">
<not-uninit/>
<not-bool/>
<valid>0:</valid>
</arg>
</function>
<function name="__builtin_bitreverse64">
<noreturn>false</noreturn>
<use-retval/>
<returnValue type="uint64_t">(arg1 = ((arg1 &amp; 0x55555555ull) &lt;&lt; 1) | ((arg1 &amp; 0xAAAAAAAAull) &gt;&gt; 1),
arg1 = ((arg1 &amp; 0x33333333ull) &lt;&lt; 2) | ((arg1 &amp; 0xCCCCCCCCull) &gt;&gt; 2),
arg1 = ((arg1 &amp; 0x0F0F0F0Full) &lt;&lt; 4) | ((arg1 &amp; 0xF0F0F0F0ull) &gt;&gt; 4),
arg1 = ((arg1 &amp; 0x00FF00FFull) &lt;&lt; 8) | ((arg1 &amp; 0xFF00FF00ull) &gt;&gt; 8),
arg1 = ((arg1 &amp; 0x0000FFFFull) &lt;&lt; 16) | ((arg1 &amp; 0xFFFF0000ull) &gt;&gt; 16),
arg1 = ((arg1 &amp; 0x00000000FFFFFFFFull) &lt;&lt; 32) | ((arg1 &amp; 0xFFFFFFFF00000000ull) &gt;&gt; 32),
arg1)
</returnValue>
<leak-ignore/>
<const/>
<arg nr="1" direction="in">
<not-uninit/>
<not-bool/>
<valid>0:</valid>
</arg>
</function>
<define name="__builtin_bit_cast(type,value)" value="std::bit_cast&lt;type&gt;(value)"/>
<!-- https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html -->
<define name="__builtin_alloca(size)" value="alloca(size)"/>
<define name="__builtin_memcpy(dest, source, size)" value="memcpy(dest, source, size)"/>
Expand Down
17 changes: 17 additions & 0 deletions test/cfg/gnu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -390,6 +390,23 @@ void valid_code(int argInt1, va_list valist_arg, const int * parg)
// cppcheck-suppress zerodiv
// cppcheck-suppress unreadVariable
i64_1 /= bswap_64(0x023456789abcde0f) - 0x0fdebc9a78563402;

#if __GNUC__ > 16
uint8_t i8_1 = 0;
// cppcheck-suppress zerodiv
// cppcheck-suppress unreadVariable
i8_1 /= __builtin_bitreverse8(1) - 128;
// cppcheck-suppress zerodiv
// cppcheck-suppress unreadVariable
i16_1 /= __builtin_bitreverse16(5) - 40960;
// cppcheck-suppress zerodiv
// cppcheck-suppress unreadVariable
i32_1 /= __builtin_bitreverse32(4294967295) - 4294967295;
// cppcheck-suppress zerodiv
// cppcheck-suppress unreadVariable
i64_1 /= __builtin_bitreverse64(8) - 1152921504606846976;
#endif

#endif
}

Expand Down
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