https://llvm.org/bugs/show_bug.cgi?id=26344
David Majnemer <david.majne...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |david.majne...@gmail.com
Resolution|--- |INVALID
--- Comment #5 from David Majnemer <david.majne...@gmail.com> ---
$ clang -fsanitize=undefined test.c -o test && ./test
test.c:11:13: runtime error: shift exponent 32 is too large for 32-bit type
'unsigned int'
0xA7 0xA7
0x1 0x1
0x0 0x0
line 11 has:
if((a = rotate_left (val, i)) <= 0xFF)
expands to:
if((a = (val << i | val >> (32 - i))) <= 0xFF)
when i == 0, we will compute:
if((a = (val << 0 | val >> (32 - 0))) <= 0xFF)
val >> 32 is undefined behavior.
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